iphone - cocoa-touch:如何将触摸传递给另一个对象

Question

恐怕这是一个初学者的问题:

我有一个覆盖整个屏幕的 UIText。我在此 UITextView 之上有另一个透明 View ，以便能够识别滑动手势(水平和垂直)，如下所示:

    - (void)viewDidLoad
{
    [super viewDidLoad];

    // UITextView
    CGRect aFrame = CGRectMake(0, 0, 320, 480);
    aTextView = [[UITextView alloc] initWithFrame:aFrame];
    aTextView.text = @"Some sample text.";
    [self.view addSubview:aTextView];

    // canTouchMe
    CGRect canTouchMeFrame = CGRectMake(0, 0, 320, 480); 
    canTouchMe = [[UIView alloc] initWithFrame:canTouchMeFrame];
    [self.view addSubview:canTouchMe];
    }

让我们考虑用户触摸(而不是滑动)canTouchMe View 。在这种情况下，我希望 canTouchMe View 消失并将触摸传递给隐藏在下方的 UITextView，以便它进入编辑模式并启用 UITextView 具有的“自然”滚动选项(即仅水平滚动)。

我的触摸开始方法如下所示:

    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    [super touchesBegan:touches withEvent:event];

    UITouch *touch =[touches anyObject];
    gestureStartPoint = [touch locationInView:self.view];
}

如果它只识别ONE touch，我如何告诉这个方法它应该隐藏 canTouchMeFrame 并将PASS ON the touch 给 UITextView？

对不起，如果这是基本的，但我不知道如何实现它。感谢您的任何建议。

---

编辑:

我引入了一个touchEnded方法，但是还是没有运气。触摸不会转发到 UITextView。我需要点击两次才能对其进行编辑:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

[super touchesMoved:touches withEvent:event];

UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];

CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); // will always be positive
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); // will always be positive


if (deltaY == 0 && deltaX == 0) {

    label.text = @"Touch"; [self performSelector:@selector(eraseText) withObject:nil afterDelay:2];

    [aTextView touchesBegan:touches withEvent:event];

    [self.view bringSubviewToFront:aTextView];
    [self.view bringSubviewToFront:doneEdit];


}

Answer 1

NSSet 有一个 -count 方法。如果 touches 只有一个对象，那么您就是在响应单次触摸。

 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    [super touchesBegan:touches withEvent:event];
    if ([touches count] == 1) {
       [self  hideMyRectangle];
       [someOtherObject touchesBegan:touches withEvent:event];
       //etc, etc.
       return;
       }
    // if you get here, there's more than one touch.       
    UITouch *touch =[touches anyObject];
    gestureStartPoint = [touch locationInView:self.view];
}