如何使用Interface Builder设置UIScreenEdgePanGestureRecognizer？ [英] How do I set up an UIScreenEdgePanGestureRecognizer using Interface Builder?

问题描述

当我使用Interface Builder将其添加到我的视图控制器时，我无法获得 UIScreenEdgePanGestureRecognizer 工作，所以我在这里要求确定我是否''做错了或者Xcode中有错误。

I can't get UIScreenEdgePanGestureRecognizer to work when I create when I add it to my view controller using Interface Builder, so I'm asking here to establish whether I'm doing something wrong or if there is a bug in Xcode.

以下是重现的步骤：

• 使用iOS的单一视图应用程序模板创建一个新的Xcode项目。


• 添加 UIView 通过从Interface Builder中的对象库中拖动一个到主视图控制器


• 通过从视图中拖动一个来添加 UIScreenEdgePanGestureRecognizer 到视图Interface Builder中的对象库


• 确保已启用手势识别器并选择了边缘：

• Create a new Xcode project using the "Single View Application" template for iOS.
• Add a UIView to the main view controller by dragging one from the Object Library in Interface Builder
• Add a UIScreenEdgePanGestureRecognizer to the view by dragging one from the Object Library in Interface Builder
• Ensure that the gesture recogniser is enabled and that an edge is selected:

• 打开 ViewController 类的助手编辑器，然后按拖动 UIScreenEdgePanGestureRecognizer 到 ViewController 的实现块来创建一个新的 IBAction
  `在动作的方法体中添加断点以测试是否正在识别边缘平移手势

• Open the assistant editor for the ViewController class and ctrl-drag from the UIScreenEdgePanGestureRecognizer to the ViewController's implementation block to create a new IBAction ` Add a breakpoint in the action's method body to test if the edge pan gesture is being recognized

生成的代码如下：

如果我在我的设备上运行该应用程序（运行iOS 8.02的iPhone 6），当我进行边缘滑动时，断点不会被击中。

If I run the application on my device (iPhone 6 running iOS 8.02) the breakpoint does not get hit when I do an edge swipe.

我有什么遗漏吗？

更新：这是作为Apple的错误提交的（rdar：// 18582306）08 -Oct-2014仍未解决Xcode 6.4（6E35b）

推荐答案

我建立了一个项目测试你的问题，发现你遇到了同样的问题。以下是我设置测试的场景：

I set up a project to test your question and found the same issue you did. Here are the scenarios I set up to test:

• 我完全按照您的操作使用Interface Builder构建屏幕边缘的手势。我的代码唯一不同的是我在选择器中放了一行代码，这样调试器就可以停下来了。调试器无法完全停止。

• I did exactly as you did, using Interface Builder, to build the screen edge gesture. The only difference in my code is that I put a line of code in the selector so the debugger would have something to stop on. The debugger failed to halt exactly as you found.

-(void)handlePan:(id)sender
{
    NSString *test = @"";
}

然后我使用捏手势创建了另一个手势使用Interface Builder查看，我能够让调试器在该选择器中停止。所以Interface Builder似乎能够正确地构建其他手势。

I then created an additional gesture using the pinch gesture on the same view using Interface Builder and I was able to get the debugger to halt within that selector. So Interface Builder seems to be able to build other gestures correctly.

在ViewController.h文件中，我包含了UIGestureRecognizerDelegate。

In the ViewController.h file I included the UIGestureRecognizerDelegate.

@interface ViewController : UIViewController <UIGestureRecognizerDelegate>
@end

在ViewController.m文件中，我手动实现了手势。

In the ViewController.m file I implemented the gesture manually.

#import "ViewController.h"

@interface ViewController ()

-(void)handlePan:(id)sender;

@end

@implementation ViewController

- (void)viewDidLoad 
{
    [super viewDidLoad];
    UIScreenEdgePanGestureRecognizer *pan = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self
                                                                                              action:@selector(handlePan:)];
    [pan setEdges:UIRectEdgeLeft];
    [pan setDelegate:self];
    [self.view addGestureRecognizer:pan];
}

-(void)handlePan:(id)sender
{
    NSString *test = @"";
}

@end

我最终得到了同样的结果你做的结论 - Interface Builder的UIScreenEdgePanGestureRecognizer的实现似乎有问题。

I ended up with the same conclusion you did - there seems to be something wrong with the Interface Builder's implementation of the UIScreenEdgePanGestureRecognizer.

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