如何在视图中的任何位置检测到点击？

Question

我有一个我的应用程序的教程，它应该只在第一次打开应用程序时显示，并应点按以解除。

我正在viewDidLoad中初始化UITapGestureRecognizer：

tapper_tut = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
tapper_tut.cancelsTouchesInView = FALSE;
[self.view addGestureRecognizer:tapper_tut];

我有一个IBAction来检测点击并将教程设置为隐藏：

- (IBAction)dismiss_tut{
    if (????????????????) {
        _tutorial.hidden = YES;
    }
}

但是我不知道在if语句条件中放什么，或者这是否是正确的方法来解决这个问题。

如何在水龙头上解雇UIImageView？

Answer 1

UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
[self.view addGestureRecognizer:gr];
// if not using ARC, you should [gr release];
// mySensitiveRect coords are in the coordinate system of self.view


- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer {
    CGPoint p = [gestureRecognizer locationInView:self.view];
    if (CGRectContainsPoint(mySensitiveRect, p)) {
        NSLog(@"got a tap in the region i care about");
    } else {
        NSLog(@"got a tap, but not where i need it");
    }
}

Answer 2

你可以像这样制作viewDidLoad

- (void)viewDidLoad 
  { 
      [super viewDidLoad];
      self.view.backgroundColor = [UIColor whiteColor];

      /* Create the Tap Gesture Recognizer */
      self.tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
                                   action:@selector(handleTaps:)]; 

     /* The number of fingers that must be on the screen */
      self.tapGestureRecognizer.numberOfTouchesRequired = 1;

     /* The total number of taps to be performed before the gesture is recognized */
      self.tapGestureRecognizer.numberOfTapsRequired = 1;

     /* Add this gesture recognizer to the view */
     [self.view addGestureRecognizer:self.tapGestureRecognizer];
  }

要检测水龙头，您可以像这样制作方法。

- (void) handleTaps:(UITapGestureRecognizer*)paramSender
  {
      NSUInteger touchCounter = 0; 
      for (touchCounter = 0;touchCounter < paramSender.numberOfTouchesRequired;touchCounter++)
      {
            CGPoint touchPoint =[paramSender locationOfTouch:touchCounter inView:paramSender.view];
            NSLog(@"Touch #%lu: %@",(unsigned long)touchCounter+1, NSStringFromCGPoint(touchPoint));
      }
  }

Answer 3

你必须将.h文件声明为“UIGestureRecognizerDelegate”

你已经按照以下步骤的两种方式轻拍手势。

1）调用GestureRecognizer的委托方法（未给出动作）

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:nil]; // not given  action.
recognizer.numberOfTouchesRequired=1;// here how many tap you want set it 
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
 {
     //whatever you want write code here
    return NO;
  }

2）给予行动

 UITapGestureRecognizer *oneTouch=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(Addphoto)];
 [oneTouch setNumberOfTouchesRequired:1];
 [self.view addGestureRecognizer:oneTouch];

 -(IBAction)Addphoto
 {
     //whatever you want write code here
 }

可能会有所帮助。

Answer 4

我想你需要检测第一次启动应用程序，你可以用它来做

！[[NSUserDefaults standardUserDefaults] boolForKey：@“HasLaunchedOnce”]

把它放在你的if语句中。