在呼叫状态栏(无法满足约束) [英] In Call Status Bar (Unable to Satisfy Constraints)

查看：20
本文介绍了在呼叫状态栏(无法满足约束)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

就像这个问题:

这是在显示呼叫状态栏之前应该是什么样子的图片:

bug 发生后状态栏的背景蓝色是根视图控制器的背景颜色.

每当显示 In Call Status Bar 时，都会打印出以下错误:

无法同时满足约束.可能以下列表中的至少一项约束是您不想要的.试试这个: (1) 查看每个约束并尝试找出您不期望的；(2) 找到添加不需要的约束或约束的代码并修复它.(注意:如果看到 NSAutoresizingMaskLayoutConstraints 不明白，请参考 UIView 属性 translatesAutoresizingMaskIntoConstraints 的文档)("<NSLayoutConstraint:0x7fdac6192320 V:|-(20)-[UIInputSetContainerView:0x7fdac6190a40] (Names: '|':UITextEffectsWindow:0x7fdac6061a10)>","<NSLayoutConstraint:0x7fdac608ebb0 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fdac6190a40] (Names: '|':UITextEffectsWindow:0x7fdac6061a10)>")将尝试通过打破约束来恢复<NSLayoutConstraint:0x7fdac6192320 V:|-(20)-[UIInputSetContainerView:0x7fdac6190a40] (Names: '|':UITextEffectsWindow:0x7fdac6061a10)>在 UIViewAlertForUnsatisfiableConstraints 处创建一个符号断点以在调试器中捕获它. 中列出的 UIView 上的 UIConstraintBasedLayoutDebugging 类别中的方法；也可能有帮助.无法同时满足约束.可能以下列表中的至少一项约束是您不想要的.试试这个: (1) 查看每个约束并尝试找出您不期望的；(2) 找到添加不需要的约束或约束的代码并修复它.(注意:如果看到 NSAutoresizingMaskLayoutConstraints 不明白，请参考 UIView 属性 translatesAutoresizingMaskIntoConstraints 的文档)("<NSLayoutConstraint:0x7fc60b03d230 V:|-(20)-[UIInputSetContainerView:0x7fc608d22020] (Names: '|':UITextEffectsWindow:0x7fc60b171720)>","<NSLayoutConstraint:0x7fc60b03d2d0 UIInputSetContainerView:0x7fc608d22020.bottom == UITextEffectsWindow:0x7fc60b171720.bottom>","<NSLayoutConstraint:0x7fc60b17c4b0 'UIInputWindowController-height' UIInputSetContainerView:0x7fc608d22020.height == UITextEffectsWindow:0x7fc60b171720.height>")将尝试通过打破约束来恢复<NSLayoutConstraint:0x7fc60b03d2d0 UIInputSetContainerView:0x7fc608d22020.bottom == UITextEffectsWindow:0x7fc60b171720.bottom>在 UIViewAlertForUnsatisfiableConstraints 处创建一个符号断点以在调试器中捕获它. 中列出的 UIView 上的 UIConstraintBasedLayoutDebugging 类别中的方法；也可能有帮助.

使用 FLEX 调试工具我可以看到

UINavigationBarBackground 和 UIStatusBarForegroundView 在 In Call Status Bar 之前重叠，但是之后的 UINavigationBarBackground 低于 UIStatusBarForegroundView.

这个错误只发生在我展示模态视图控制器之后.如果我显示通话中状态栏，则问题不会发生.显示模态视图控制器后，您无法返回根视图控制器.

我该怎么做才能解决这个问题?

解决方案

iOS 9.2.1, Xcode 7.2.1, ARC enabled

更新 3/25/2016: Xcode 7.3、iOS 9.3 中仍然存在冲突.

总结:在您的应用程序的窗口层次结构中，有各种窗口被添加到应用程序窗口中.就我而言，这是 UITextEffectsWindow 和 UIRemoteKeyboardWindow.这些窗口带有预配置的约束.似乎有一个错误会更新某些垂直布局约束，但不会更新同一窗口的其他相关约束.这会在调试器中引发约束冲突.当在模拟器和实际 iOS 设备上将自定义窗口添加到窗口层次结构或呼叫中状态栏切换入或切换出时，就会发生这种情况.

约束的优先级为 1000，这表明它们是必需的约束.

下面的解决方案将删除冲突约束，并在切换出通话状态栏后将其添加回来.

EDIT 2/25/2016: 这两个解决方案都没有解决打开应用程序时已显示通话状态栏的问题.冲突发生在状态栏的变化被注册之前.

这种约束冲突似乎只发生在第一次显示通话状态栏时(这是最常见的)，或者在其他涉及显示位于关键窗口顶部的附加自定义窗口的情况下.我还尝试创建一个空白的单视图应用程序，并在通话状态栏中不添加任何切换，但遇到了相同的约束冲突.

我认为这是一个错误，并在开发论坛上进行了讨论.可以在此处找到来自开发论坛的原始文章(正如马蒂指出的那样):

解释约束错误后(请参阅此苹果文档以帮助解决此问题:https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/AutolayoutPG/DebuggingTricksandTips.html) 我使用以下代码来摆脱冲突的约束:

目标 C:

*AppDelegate.h

<代码>...@interface YourAppName : UIResponder {NSMutableDictionary *dictionaryConstraints;}...

*AppDelegate.m

<代码>...- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{//在应用程序启动后覆盖自定义点.dictionaryConstraints = [[NSMutableDictionary alloc] init];返回真；}- (void)application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame{NSLog(@"newStatusBarFrame: %@", NSStringFromCGRect(newStatusBarFrame));如果(newStatusBarFrame.size.height > 20.0){for (UIWindow *window in [[UIApplication sharedApplication] windows]){if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"]){NSMutableArray *constraints = [[NSMutableArray alloc] initWithCapacity:[window.constraints count]];for (NSLayoutConstraint *constraint in window.constraints){if (!([constraint.description rangeOfString:@"V:|-(0)-[UIInputSetContainerView"].location == NSNotFound)){NSLog(@"");NSLog(@"%@: %@, %f, %f", window.class.description,constraint.description,constraint.priority,constraint.constant);NSLog(@"");[约束添加对象:约束];[窗口删除约束:约束]；}别的{零;}}if ([约束计数] > 0){[dictionaryConstraints setObject:constraints forKey:[NSString stringWithFormat:@"%p", window]];}别的{零;}}别的{零;}}}别的{零;}}- (void)resetConstraints{for (UIWindow *window in [[UIApplication sharedApplication] windows]){if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"]){如果(字典约束){NSArray *keys = [dictionaryConstraints allKeys];for (int i = 0; i < [keys count]; i++){if ([[NSString stringWithFormat:@"%p", window] isEqualToString:keys[i]]){[window addConstraints:[dictionaryConstraints objectForKey:keys[i]]];}别的{零;}}}别的{零;}}别的{零;}}}- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame{NSLog(@"oldStatusBarFrame: %@", NSStringFromCGRect(oldStatusBarFrame));如果(oldStatusBarFrame.size.height > 20.0){if ([dictionaryConstraints count] > 0){[自我重置约束];[dictionaryConstraints removeAllObjects];}别的{零;}}别的{零;}for (UIWindow *window in [[UIApplication sharedApplication] windows]){if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"]){for (NSLayoutConstraint *constraint in window.constraints){if (!([constraint.description rangeOfString:@"V:|-(0)-[UIInputSetContainerView"].location == NSNotFound)){NSLog(@"");NSLog(@"%@: %@, %f, %f", window.class.description,constraint.description,constraint.priority,constraint.constant);NSLog(@"");}别的{零;}}}别的{零;}}}...

斯威夫特:

*AppDelegate.swift

<代码>...var dictionaryConstraints = [NSString : NSArray]();...func 应用程序(应用程序:UIApplication，willChangeStatusBarFrame newStatusBarFrame:CGRect){打印(newStatusBarFrame:(newStatusBarFrame)")如果 newStatusBarFrame.size.height >20.0{用于 UIApplication.sharedApplication().windows 中的窗口{if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow")){var 约束 = [NSLayoutConstraint]()用于 window.constraints 中的约束{if (constraint.description.containsString("V:|-(0)-[UIInputSetContainerView")){打印("(window.classForCoder.debugDescription), (constraint.description), (constraint.priority), (constraint.constant)")约束.附加(约束)window.removeConstraint(约束)}别的{//零}}如果(constraints.count > 0){dictionaryConstraints[NSString(format: "%p", unsafeAddressOf(window))] = 约束}别的{//零}}别的{//零}}}别的{//零}}func resetConstraints(){用于 UIApplication.sharedApplication().windows 中的窗口{if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow")){如果(dictionaryConstraints.count > 0){让键 = Array(dictionaryConstraints.keys)对于 i 在 0 ..<键数{if (NSString(format: "%p", unsafeAddressOf(window)) == keys[i]){window.addConstraints(dictionaryConstraints[keys[i]] as! [NSLayoutConstraint])}别的{//零}}}别的{//零}}别的{//零}}}func 应用程序(应用程序:UIApplication，didChangeStatusBarFrame oldStatusBarFrame:CGRect){打印(oldStatusBarFrame:(oldStatusBarFrame)")如果(oldStatusBarFrame.size.height > 20.0){如果(dictionaryConstraints.count > 0){self.resetConstraints()dictionaryConstraints.removeAll()}别的{//零}}别的{//零}用于 UIApplication.sharedApplication().windows 中的窗口{if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow")){用于 window.constraints 中的约束{if (constraint.description.containsString("V:|-(0)-[UIInputSetContainerView")){打印("(window.classForCoder.debugDescription), (constraint.description), (constraint.priority), (constraint.constant)")}别的{//零}}}别的{//零}}}...

注意:这会保留所有不冲突的约束.并在冲突情况消失后重新添加移除的冲突约束，即呼出状态栏.

更新 2/25/2015: 进一步测试...

我决定在应用程序中使用两种方法来隔离不断变化的约束.委托 *.m 文件:

<代码>...- (void)application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame{NSLog(@"新状态栏框架:%@", NSStringFromCGRect(newStatusBarFrame));for (UIWindow *window in [[UIApplication sharedApplication] windows]){NSLog(@"%@, %@", window.description, window.constraints);}}- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame{NSLog(@"旧状态栏框架:%@", NSStringFromCGRect(oldStatusBarFrame));for (UIWindow *window in [[UIApplication sharedApplication] windows]){NSLog(@"%@, %@", window.description, window.constraints);}}...

当通话状态栏切换进来时，冲突的约束从:

UITextEffectsWindow:

<块引用>

>,

( "< NSLayoutConstraint:0x7fbf99667eb0 V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0](名称:'|':UITextEffectsWindow:0x7fbf994cc810 )>",

...省略

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0](名称:'|':UITextEffectsWindow:0x7fbf994cc810) >",

...省略 )

UIRemoteKeyboardWindow:

<块引用>

>,

( "< NSLayoutConstraint:0x7fbf994cfb20 V:|-(0)-[UIInputSetContainerView:0x7fbf99744ec0](名称:'|':UIRemoteKeyboardWindow:0x7fbf994ceb80) >",

...省略

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810,

)>

...省略 )

...并更改为:

UITextEffectsWindow:

<块引用>

>,

( "< NSLayoutConstraint:0x7fbf99667eb0 V:|-(20)-[UIInputSetContainerView:0x7fbf99668ce0](名称:'|':UITextEffectsWindow:0x7fbf994cc810 )>",

...省略

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0](名称:'|':UITextEffectsWindow:0x7fbf994cc810) >",

...省略 )

UIRemoteKeyboardWindow:

<块引用>

>,

( "< NSLayoutConstraint:0x7fbf994cfb20 V:|-(20)-[UIInputSetContainerView:0x7fbf99744ec0](名称:'|':UIRemoteKeyboardWindow:0x7fbf994ceb80) >",

...省略

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810,

)>

...省略 )

要了解视觉格式语言，请阅读 https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/AutolayoutPG/VisualFormatLanguage.html

Vertical Layout V:[topField]-XX-[bottomField]"格式中的垂直布局约束似乎从...

<块引用>

NSLayoutConstraint:0x7fbf99667eb0V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0]

到...

<块引用>

NSLayoutConstraint:0x7fbf99667eb0V:|-(20)-[UIInputSetContainerView:0x7fbf99668ce0]

...对于两个窗口:UITextEffectsWindow 和 UIRemoteKeyboardWindow；然而……

<块引用>

NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top'V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0]

...没有.

因此，根据我的推断，窗口会调整其约束以考虑添加的通话中状态栏，但 UIInputWindowController 不会.因此，约束冲突出现了.

但是情节变厚了...

调用中状态栏切换导致初始约束冲突后，约束不变，优先级相同，但进一步切换调用中状态栏 in 或出去.但是，这只是因为已经抛出了最初的冲突.

希望这有帮助！干杯.

感谢所有原始贡献者.

Just like this question: Auto Layout and in-call status bar and this question: Resize for in-call status bar?, I am having issues with the In Call Status Bar screwing up my view layout.

Here is my nested structure. I have a Custom Modal ViewController that is nested within another ViewController. Whenever the In Call Status Bar is shown (and then closed out of), this is what happens:

Here is a picture of what it should look like before the In Call Status Bar is shown:

The background blue color of the status bar after the bug occurs is the background color of the root view controller.

Whenever an In Call Status Bar is shown, the following error is printed out: 

Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7fdac6192320 V:|-(20)-[UIInputSetContainerView:0x7fdac6190a40]   (Names: '|':UITextEffectsWindow:0x7fdac6061a10 )>",
    "<NSLayoutConstraint:0x7fdac608ebb0 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fdac6190a40]   (Names: '|':UITextEffectsWindow:0x7fdac6061a10 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fdac6192320 V:|-(20)-[UIInputSetContainerView:0x7fdac6190a40]   (Names: '|':UITextEffectsWindow:0x7fdac6061a10 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7fc60b03d230 V:|-(20)-[UIInputSetContainerView:0x7fc608d22020]   (Names: '|':UITextEffectsWindow:0x7fc60b171720 )>",
    "<NSLayoutConstraint:0x7fc60b03d2d0 UIInputSetContainerView:0x7fc608d22020.bottom == UITextEffectsWindow:0x7fc60b171720.bottom>",
    "<NSLayoutConstraint:0x7fc60b17c4b0 'UIInputWindowController-height' UIInputSetContainerView:0x7fc608d22020.height == UITextEffectsWindow:0x7fc60b171720.height>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fc60b03d2d0 UIInputSetContainerView:0x7fc608d22020.bottom == UITextEffectsWindow:0x7fc60b171720.bottom>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

Using FLEX debugging tool I can see that

UINavigationBarBackground and UIStatusBarForegroundView overlap before the In Call Status Bar, however afterwards UINavigationBarBackground is below UIStatusBarForegroundView.

This bug only occurs AFTER I present the Modal View Controller. If I show the In Call Status Bar, then the issue does not occur. You cannot go back to the root view controller after the Modal View Controller is shown.

What can I do to fix this?

解决方案

iOS 9.2.1, Xcode 7.2.1, ARC enabled

UPDATE 3/25/2016: Conflict still exists in Xcode 7.3, iOS 9.3.

Summary: In the window hierarchy for your application there are various windows that get added onto the application window. In my case, this was the UITextEffectsWindow and the UIRemoteKeyboardWindow. These windows come with preconfigured constraints. It seems there is a bug that updates some vertical layout constraints, but not other related constraints for the same window. This throws the constraints conflict in debugger. This happens when a custom window gets added to the window hierarchy or when the in-call status bar gets toggled in or out, on both the simulator and the actual iOS device.

The constraints are priority 1000, this indicates that they are required constraints.

The solution below will remove the conflicting constraint and add it back once the in-call status bar is toggled out.

EDIT 2/25/2016: Neither solution solves the problem of having the in-call status bar already displayed when opening app. The conflict happens before the change in status bar is registered.

It appears that this constraint conflict happens only the first time the in-call status bar is shown (this is most common), or in other scenarios involving the presentation of an additional custom window that would sit on top of the key window. I also tried just creating a blank single view application and with adding nothing toggling in the in-call status bar, and I got the same constraint conflict.

I think it is a bug and is discussed on the Dev forums. The original article from the Dev forums can be found here (as matty pointed out):

https://forums.developer.apple.com/thread/16375

I wanted to expand a little on matty's answer here. Which I found very helpful. I am not sure what impact removing "all" the constraints would cause, so I removed just the conflicting constraints. My reasoning being that the conflicting constraint will be broken anyway as the debugger informs "Will attempt to recover by breaking constraint"; so the constraint will serve no purpose anyway.

Here are the constraint conflict errors I was receiving:

After interpreting the constraint errors (see this apple document to help with that: https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/AutolayoutPG/DebuggingTricksandTips.html) I used the following code to get rid of the conflicting constraints:

Objective-C:

*AppDelegate.h

...

@interface YourAppName : UIResponder <UIApplicationDelegate>
{
    NSMutableDictionary *dictionaryConstraints;
}

...

*AppDelegate.m

...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    dictionaryConstraints = [[NSMutableDictionary alloc] init];

    return true;

}

- (void)application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame
{
   NSLog(@"newStatusBarFrame: %@", NSStringFromCGRect(newStatusBarFrame));

   if (newStatusBarFrame.size.height > 20.0)
   {
        for (UIWindow *window in [[UIApplication sharedApplication] windows])
        {
            if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"])
            {
                NSMutableArray *constraints = [[NSMutableArray alloc] initWithCapacity:[window.constraints count]];

                for (NSLayoutConstraint *constraint in window.constraints)
                {
                    if (!([constraint.description rangeOfString:@"V:|-(0)-[UIInputSetContainerView"].location == NSNotFound))
                    {
                        NSLog(@"");
                        NSLog(@"%@: %@, %f, %f", window.class.description, constraint.description, constraint.priority, constraint.constant);
                        NSLog(@"");

                        [constraints addObject:constraint];
                        [window removeConstraint:constraint];
                    }
                    else
                    {
                        nil;
                    }
                }

                if ([constraints count] > 0)
                {
                    [dictionaryConstraints setObject:constraints forKey:[NSString stringWithFormat:@"%p", window]];
                }
                else
                {
                    nil;
                }
            }
            else
            {
                nil;
            }
        }
    }
    else
    {
        nil;
    }
}

- (void)resetConstraints
{
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"])
        {
            if (dictionaryConstraints)
            {
                NSArray *keys = [dictionaryConstraints allKeys];

                for (int i = 0; i < [keys count]; i++)
                {
                    if ([[NSString stringWithFormat:@"%p", window] isEqualToString:keys[i]])
                    {
                        [window addConstraints:[dictionaryConstraints objectForKey:keys[i]]];
                    }
                    else
                    {
                        nil;
                    }
                }
            }
            else
            {
                nil;
            }
        }
        else
        {
            nil;
        }
    }
}

- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame
{
    NSLog(@"oldStatusBarFrame: %@", NSStringFromCGRect(oldStatusBarFrame));

    if (oldStatusBarFrame.size.height > 20.0)
    {
        if ([dictionaryConstraints count] > 0)
        {
            [self resetConstraints];
            [dictionaryConstraints removeAllObjects];
        }
        else
        {
            nil;
        }
    }
    else
    {
        nil;
    }

    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        if ([window.class.description isEqual:@"UITextEffectsWindow"] || [window.class.description isEqual:@"UIRemoteKeyboardWindow"])
        {
            for (NSLayoutConstraint *constraint in window.constraints)
            {
                if (!([constraint.description rangeOfString:@"V:|-(0)-[UIInputSetContainerView"].location == NSNotFound))
                {
                    NSLog(@"");
                    NSLog(@"%@: %@, %f, %f", window.class.description, constraint.description, constraint.priority, constraint.constant);
                    NSLog(@"");
                }
                else
                {
                    nil;
                }

            }
        }
        else
        {
            nil;
        }
    }
}

...

Swift:

*AppDelegate.swift

...

var dictionaryConstraints = [NSString : NSArray]();

...

func application(application: UIApplication, willChangeStatusBarFrame newStatusBarFrame: CGRect)
{
    print("newStatusBarFrame: (newStatusBarFrame)")

    if newStatusBarFrame.size.height > 20.0
    {
        for window in UIApplication.sharedApplication().windows
        {
            if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow"))
            {
                var constraints = [NSLayoutConstraint]()

                for constraint in window.constraints
                {
                    if (constraint.description.containsString("V:|-(0)-[UIInputSetContainerView"))
                    {
                        print("(window.classForCoder.debugDescription), (constraint.description), (constraint.priority), (constraint.constant)")

                        constraints.append(constraint)
                        window.removeConstraint(constraint)
                    }
                    else
                    {
                        //nil
                    }
                }

                if (constraints.count > 0)
                {
                    dictionaryConstraints[NSString(format: "%p", unsafeAddressOf(window))] = constraints
                }
                else
                {
                    //nil
                }
            }
            else
            {
                //nil
            }
        }
    }
    else
    {
        //nil
    }
}

func resetConstraints()
{
    for window in UIApplication.sharedApplication().windows
    {
        if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow"))
        {
            if (dictionaryConstraints.count > 0)
            {
                let keys = Array(dictionaryConstraints.keys)

                for i in 0 ..< keys.count
                {
                    if (NSString(format: "%p", unsafeAddressOf(window)) == keys[i])
                    {
                        window.addConstraints(dictionaryConstraints[keys[i]] as! [NSLayoutConstraint])
                    }
                    else
                    {
                        //nil
                    }
                }
            }
            else
            {
                //nil
            }
        }
        else
        {
            //nil
        }
    }
}

func application(application: UIApplication, didChangeStatusBarFrame oldStatusBarFrame: CGRect)
{
    print("oldStatusBarFrame: (oldStatusBarFrame)")

    if (oldStatusBarFrame.size.height > 20.0)
    {
        if (dictionaryConstraints.count > 0)
        {
            self.resetConstraints()
            dictionaryConstraints.removeAll()
        }
        else
        {
            //nil
        }
    }
    else
    {
        //nil
    }

    for window in UIApplication.sharedApplication().windows
    {
        if ((window.classForCoder.description() == "UITextEffectsWindow") || (window.classForCoder.description() == "UIRemoteKeyboardWindow"))
        {
            for constraint in window.constraints
            {
                if (constraint.description.containsString("V:|-(0)-[UIInputSetContainerView"))
                {
                    print("(window.classForCoder.debugDescription), (constraint.description), (constraint.priority), (constraint.constant)")
                }
                else
                {
                    //nil
                }
            }
        }
        else
        {
            //nil
        }
    }
}

...

Note: This keeps all constraints that are not conflicting. And adds the removed conflicting constraints back in after the conflicting situation is no more, namely the in-call status bar is toggled out.

UPDATE 2/25/2015: Further testing...

I decided to isolate the changing constraints using two methods in the app. delegate *.m file:

...

- (void)application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame
{
    NSLog(@"New status bar frame: %@", NSStringFromCGRect(newStatusBarFrame));

    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        NSLog(@"%@, %@", window.description, window.constraints);
    }
}

- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame
{
    NSLog(@"Old status bar frame: %@", NSStringFromCGRect(oldStatusBarFrame));

    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        NSLog(@"%@, %@", window.description, window.constraints);
    }
}

...

When the in-call status bar toggles in, the conflicting constraints change from:

UITextEffectsWindow:

< UITextEffectsWindow: 0x7fbf994cc810; frame = (0 0; 320 568); opaque = NO; autoresize = W+H; layer = < UIWindowLayer: 0x7fbf994c8470> >,

( "< NSLayoutConstraint:0x7fbf99667eb0 V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 )>",

...omitted

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 ) >",

...omitted )

UIRemoteKeyboardWindow:

< UIRemoteKeyboardWindow: 0x7fbf994ceb80; frame = (0 0; 320 568); opaque = NO; autoresize = W+H; layer = < UIWindowLayer: 0x7fbf994cf190> >,

( "< NSLayoutConstraint:0x7fbf994cfb20 V:|-(0)-[UIInputSetContainerView:0x7fbf99744ec0] (Names: '|':UIRemoteKeyboardWindow:0x7fbf994ceb80 ) >",

...omitted

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 )>",

...omitted )

...and changes to:

UITextEffectsWindow:

< UITextEffectsWindow: 0x7fbf994cc810; frame = (0 0; 320 568); opaque = NO; autoresize = W+H; layer = < UIWindowLayer: 0x7fbf994c8470> >,

( "< NSLayoutConstraint:0x7fbf99667eb0 V:|-(20)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 )>",

...omitted

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 ) >",

...omitted )

UIRemoteKeyboardWindow:

< UIRemoteKeyboardWindow: 0x7fbf994ceb80; frame = (0 0; 320 568); opaque = NO; autoresize = W+H; layer = < UIWindowLayer: 0x7fbf994cf190> >,

( "< NSLayoutConstraint:0x7fbf994cfb20 V:|-(20)-[UIInputSetContainerView:0x7fbf99744ec0] (Names: '|':UIRemoteKeyboardWindow:0x7fbf994ceb80 ) >",

...omitted

"< NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0] (Names: '|':UITextEffectsWindow:0x7fbf994cc810 )>",

...omitted )

To understand the visual formatting language read https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/AutolayoutPG/VisualFormatLanguage.html

It appears that the vertical layout constraints in the format "Vertical Layout V:[topField]-XX-[bottomField]" changes from...

NSLayoutConstraint:0x7fbf99667eb0 V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0]

to...

NSLayoutConstraint:0x7fbf99667eb0 V:|-(20)-[UIInputSetContainerView:0x7fbf99668ce0]

...for both windows: UITextEffectsWindow and UIRemoteKeyboardWindow; however, ...

NSLayoutConstraint:0x7fbf9966c800 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x7fbf99668ce0]

...does not.

So from what I can deduce, the window adjusts its constraint to account for the added in-call status bar, but the UIInputWindowController does not. Therefore, the constraint conflict arrises.

But the plot thickens...

After the initial constraints conflict resulting from the in-calls status bar toggling, the constraints do not change, and the priority is the same, but the constraints conflict does not arise with further toggling of the in-call status bar in or out. But, this just because the initial conflict was already thrown.

Hope this helps! Cheers.

Thanks to all the original contributors.

这篇关于在呼叫状态栏(无法满足约束)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
移动开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆