以编程方式实例化的子视图中的 iOS UIButton 未触发

iOS UIButton in programmatically instantiated subview not firing(以编程方式实例化的子视图中的 iOS UIButton 未触发)

问题描述

我的故事板中有一个 Nib，它没有连接到任何东西，但我正在将它实例化为子视图:

I have a Nib in my storyboard which is not connected to anything but I'm instantiating it as a subview thusly:

-(void)LoadCameraOverlayView
{
    CameraOverlayViewController *cameraVC = [self.storyboard instantiateViewControllerWithIdentifier:@"CameraOverlayNib"];
    cameraVC.view.userInteractionEnabled = YES;
    [self.view addSubview:cameraVC.view];
}

UIViewController 有一个带反馈的摄像头，它工作正常，还有一个按钮(当我转到视图控制器时也可以正常工作.)

The UIViewController has a camera with feedback which is working fine and a button which (when I segue to the view controller also works fine.)

按钮与 Touch Down 事件和 Touch Up Inside 事件相关联.

The button is linked to a Touch Down event and Touch Up Inside event.

当我单击该按钮时，我可以看到它正在从默认状态更改为焦点或突出显示状态，但是似乎没有任何代码正在执行.如果我将 NSLog 放在 ViewDidLoad 中，我可以在控制台中看到它，但对于链接方法却看不到.但是，如果我继续使用该视图，它确实有效.

When I click the button I can see it is changing visually from its default state to its focused or highlighted state however none of the code seems to be executing. If I put an NSLog in the ViewDidLoad I can see that in the console but not for the linked method. However if I segue to the view it does work.

发生了什么事?

我查看了其他解决方案，但我认为这可能是因为我在单击按钮时可以看到视觉变化，因此可能是有视图挡住了视线，或者 CGRect 没有正确校准或其他原因.

I looked at other solutions but I don't think it could be that there is a view in the way or that the CGRect isn't calibrated correctly or anything since I can see the visual change when clicking the button.

推荐答案

这段代码违反了如何使用视图控制器的规则一:

This code violates Rule One of how to use view controllers:

CameraOverlayViewController *cameraVC = [self.storyboard instantiateViewControllerWithIdentifier:@"CameraOverlayNib"];
[self.view addSubview:cameraVC.view];

您不能像这样简单地实例化视图控制器，然后手动将其视图添加到视图层次结构中.对此有非常严格的规定；为了手动将视图控制器的视图添加到界面中，您必须进行精心制作的舞蹈"，而您并没有在跳舞.

You cannot simply instantiate a view controller and then add its view manually to the view hierarchy like that. There are very strict rules about this; there is an elaborate "dance" that you must do in order to add a view controller's view to your interface manually, and you are not doing the dance.

结果是您的 cameraVC 开始存在，在视图控制器层次结构中没有任何位置，然后消失得无影无踪.因此，您的按钮没有可与之交谈的对象，因此当点击按钮时，什么也没有发生.

The result is that your cameraVC comes into existence, is given no place in the view controller hierarchy, and vanishes in a puff of smoke. There is thus no object for your button to talk to, and so when the button is tapped, nothing happens.

我的建议是:对这个视图使用 .xib 文件，而不是故事板场景；在你加载它并将它放入界面之后，使用代码来配置按钮，以便它与 self 对话，你的 current 视图控制器.

My suggestion would be: use a .xib file, not a storyboard scene, for this view; and after you have loaded it and put it into the interface, use code to configure the button so that it talks to self, your current view controller.

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