自动布局约束预警与QUOT;将试图打破约束＆QUOT恢复; （可能的逻辑问题） [英] Autolayout constraints warning "Will attempt to recover by breaking constraint" (possible logic issue)
问题描述
我设置了iPhone 4的一些具体的限制，当应用程序在此设备上运行。对齐和一切方面都很好看。
I am setting some specifics constraints for iPhone 4 when the app is ran on this device. Everything look great in terms of alignment and everything.
不过，我收到了我所有的约束正试图打破限制恢复它们。
But, I am getting an for all my constraints that is trying to recover them by breaking the constraints.
此方法获取调用我的viewDidLoad中检测到时，如果一个iPhone 4
This method gets call in my viewDidLoad when it detects if its an iPhone 4
- (void) addConstraints {
// removing automatic system constraints
[self.view removeConstraints:self.view.constraints];
[self.view setTranslatesAutoresizingMaskIntoConstraints:NO];
NSDictionary *views = NSDictionaryOfVariableBindings(appBackground, myCustomer, myItemDetails, myItemQuantity, myItemPrice, myNext, myBtn); // UIImageView, UITextField, UIButton
for (UIView *view in [views allValues]) {
view.translatesAutoresizingMaskIntoConstraints = NO;
}
NSDictionary *metrics = @{@"width": @210.0, @"height": @42.0, @"verticalSpacing": @34};
NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[appBackground]|"
options:0
metrics:nil
views:views];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[appBackground]|"
options:0
metrics:nil
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(85)-[myCustomer(==height)]-(verticalSpacing)-[myItemDetails(==height)]-(verticalSpacing)-[myItemQuantity(==height)]-(verticalSpacing)-[myItemPrice(==height)]-(18)-[myNext(==35)]-(71.5)-[myBtn(==50)]-(7.5)-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[myCustomer(==width)]-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[myItemDetails(==width)]-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[myItemQuantity(==width)]-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[myItemPrice(==width)]-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-78-[myNext(==173)]-|"
options:0
metrics:metrics
views:views]];
constraints = [constraints arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-11.5-[myBtn(==54)]-|"
options:0
metrics:metrics
views:views]];
[self.view addConstraints:constraints];
}
错误！
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:0xb8282f0 H:|-(50)-[UITextField:0xb823fc0] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb828320 H:[UITextField:0xb823fc0(210)]>",
"<NSLayoutConstraint:0xb82be10 H:[UITextField:0xb823fc0]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb82d3d0 H:|-(78)-[UIButton:0xb82ad50] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb82d420 H:[UIButton:0xb82ad50(173)]>",
"<NSLayoutConstraint:0xb82d450 H:[UIButton:0xb82ad50]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0xb82d450 H:[UIButton:0xb82ad50]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2014-08-03 14:03:29.239 iReceipt[2886:607] 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:0xb8282f0 H:|-(50)-[UITextField:0xb823fc0] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb828320 H:[UITextField:0xb823fc0(210)]>",
"<NSLayoutConstraint:0xb82be10 H:[UITextField:0xb823fc0]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb82d480 H:|-(11.5)-[UIButton:0xb820120] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb82e390 H:[UIButton:0xb820120(54)]>",
"<NSLayoutConstraint:0xb82e3c0 H:[UIButton:0xb820120]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0xb82e3c0 H:[UIButton:0xb820120]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>
请让我知道，如果你们需要更多的信息。
Please let me know if you guys need more information..
推荐答案
这三个约束：
"<NSLayoutConstraint:0xb8282f0 H:|-(50)-[UITextField:0xb823fc0] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb828320 H:[UITextField:0xb823fc0(210)]>",
"<NSLayoutConstraint:0xb82be10 H:[UITextField:0xb823fc0]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>",
决定了上海华50 + 210 + 20 = = 280点宽。
dictate that the superview be 50 + 210 + 20 == 280 points wide.
这三个约束：
"<NSLayoutConstraint:0xb82d3d0 H:|-(78)-[UIButton:0xb82ad50] (Names: '|':UIView:0xb82f360 )>",
"<NSLayoutConstraint:0xb82d420 H:[UIButton:0xb82ad50(173)]>",
"<NSLayoutConstraint:0xb82d450 H:[UIButton:0xb82ad50]-(NSSpace(20))-| (Names: '|':UIView:0xb82f360 )>"
决定了相同的SuperView是78 + 173 + 20 = = 271点宽。
dictate that the same superview be 78 + 173 + 20 == 271 points wide.
显然，那些不能同时在同一时间是真实的。你需要决定你真的想在这里发生的事情。我们无法了解你的心思两者不可UIKit的。
Obviously, those can't both be true at the same time. You need to decide what you really want to happen here. We can't read your mind and neither can UIKit.
通常情况下，你不设置按钮的宽度约束;你让它使用其固有大小为内容的拥抱和COM pression阻力适当的优先顺序。此外，您可能不希望设置硬盘的间距按钮的两侧。要么让那间距变化没有约束使按键可以与其固有大小，比约束的优先级，它是可选的，或者使一个不平等的，所以你有一个最小间距，但不是一个确切的间距。
Usually, you don't set a width constraint on a button; you let it use its intrinsic size with appropriate priorities for content hugging and compression resistance. Also, you may not wish to set hard spacing on either side of the button. Either let that spacing vary without constraint so the button can be its intrinsic size, lower the priority of that constraint so it's optional, or make an inequality so you have a minimum spacing but not an exact spacing.
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