在屏幕上的任何位置检测触摸 [英] Detecting a touch anywhere on the screen

问题描述

我想知道用户何时触摸了我的应用程序屏幕上的任何位置。

我已经使用 - （UIResponder *）nextResponder 查看，但很遗憾，这不会工作，因为我也自动重新加载表，所以这发生时会触发。

我也尝试过一个手势识别器，用下面的代码。但这只会识别触摸视图。在那里我有很多按钮，用户将使用来操作应用程序。我想避免在屏幕上的每个按钮和段控件中添加手势识别器或代码。

  UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget：self action：@selector（tapOnView :)]; 
 [self.mainView addGestureRecognizer：tap]; 
 
  - （void）tapOnView：（UITapGestureRecognizer *）sender 
 {
 // do something 
} 
  pre> 
 
 
我也尝试过  - （void）touchesBegan：（NSSet *）touches withEvent：（UIEvent *）event 同样的问题作为手势识别器。
 
 
 
我想知道是否有任何方式，我可以实现这个任务。我希望我可以从nextResponder中识别事件的类型，然后我可以检测它是否是按钮例如。
 
 
 
 编辑：我工作的原因是，我的应用程序需要保持活动，屏幕不能锁定（所以我已禁用屏幕锁定）。为了避免过度使用电源，我需要调暗屏幕，但一旦应用程序被触摸后，然后将亮度恢复到原来的水平。 
解决方案
您可以附加 UITapGestureRecognizer 。
 
 
 
或者，您可以覆盖  
 
 
有你的根的 hitTest：  UIView 你希望完成的特定任务？ 
 
 
 
 编辑：使用 hitTest：。
  @interface PassthroughView：UIView 
 @property（readonly） 
 @property（readonly）SEL selector; 
 @end 
 @implementation PassthroughView 
  - （void）setTarget：（id）target selector：（SEL）selector {
 _target = target; 
 _selector = selector; 
} 
  - （UIView *）hitTest：（CGPoint）point withEvent：（UIEvent *）event {
 [_target performSelector：_selector]; 
 return nil; 
} 
 @end 
 
 
 @implementation YourUIViewController {
 PassthroughView * anytouchView; 
} 
  - （void）viewDidLoad {
 //添加到结尾，因此它高于所有其他视图。 
 anytouchView = [[PassthroughView alloc] initWithFrame：self.view.bounds]; 
 [anytouchView setAutoresizingMask：UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 
 [anytouchView setTarget：self selector：@selector（undim）]; 
 [anytouchView setHidden：YES]; 
 [self.view addSubview：anytouchView]; 
} 
  - （void）undim {
 [anytouchView setHidden：YES]; 
} 
  - （void）dim {
 [anytouchView setHidden：NO]; 
} 
 @end 
  
 
I am wanting to know when a user has touched anywhere on the screen of my app. 

I have looked into using -(UIResponder *)nextResponder but unfortunately this will not work, as I am also reloaded a table automatically, so this gets trigged when that occurs.

I have also tried a gesture recognizer, with the following code. But this will only recognise touches on the view. Where as I have many buttons the user will be using to operate the app. I would like to avoid adding a gesture recogniser or code for this in every button and segment control I have on the screen
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOnView:)];
[self.mainView addGestureRecognizer:tap];

- (void)tapOnView:(UITapGestureRecognizer *)sender
{
    //do something
}
I have also tried -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event , but this has the same issue as the gesture recognizer.

I was wondering if there is any way I could achieve this task. I was hoping that I may be able to recognise the type of event from within the nextResponder, and then I could detect if it is button for example.

EDIT: The reason I am working on this is that my app needs to stay active and the screen cannot be locked (so I have disabled screen locking). To avoid excessive use of power, I need to dim the screen, but then return the brightness back to the original level once the app is touched. I need this feature to only occur on 1 of my viewcontrollers.
解决方案
You could attach your UITapGestureRecognizer to your [[UIApplication sharedApplication] keyWindow].

Alternatively, you could override hitTest: of your root UIView.

Is there a particular task you are hoping to accomplish? There may be a better way than assigning an "anywhere" gesture.

Edit: Use hitTest:.
@interface PassthroughView : UIView
@property (readonly) id target;
@property (readonly) SEL selector;
@end
@implementation PassthroughView
- (void)setTarget:(id)target selector:(SEL)selector {
  _target = target;
  _selector = selector;
}
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
  [_target performSelector:_selector];
  return nil;
}
@end


@implementation YourUIViewController {
  PassthroughView *anytouchView;
}
- (void)viewDidLoad {
  // Add this at the end so it's above all other views.
  anytouchView = [[PassthroughView alloc] initWithFrame:self.view.bounds];
  [anytouchView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
  [anytouchView setTarget:self selector:@selector(undim)];
  [anytouchView setHidden:YES];
  [self.view addSubview:anytouchView];
}
- (void)undim {
  [anytouchView setHidden:YES];
}
- (void)dim {
  [anytouchView setHidden:NO];
}
@end


                        
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