iphone - UIView 之外的触摸

Question

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [touches anyObject];
  NSLog(@"The tag %i",touch.view.tag);
  if( [touch.view isKindOfClass:[UIScrollView class]] ) {
    for( UIView *checkview in [self.view subviews] ) {
      if( [checkview tag] == 1 ) {
        infoIsVisibile = NO;
        [info removeFromSuperview];                         
      }
    }
  }
  [super touchesBegan:touches withEvent:event];
}

谁能帮帮我，这只会检测 subview 内的触摸，而不是主视图。

Answer 1

您可以将 UIGestureRecognizer 连接到您感兴趣的 View 。

(一般来说，手势识别器是一种更强大的机制，用于检测任意 View 中的触摸，并且它们可以很好地处理 UIWebViews 和 UIScrollViews 等倾向于吃掉传统触摸事件的 View 。)

这是一个片段:

UITapGestureRecognizer *singleFingerDTap = [[UITapGestureRecognizer alloc]
        initWithTarget:self action:@selector(handleSingleDoubleTap:)];
    singleFingerDTap.numberOfTapsRequired = 2;
    [self.theView addGestureRecognizer:singleFingerDTap];
    [singleFingerDTap release];

(此代码来自下面的链接文档——请注意，self.theView 可能是作为当前对象的成员存储的一些随机 View 。)

您会惊讶(或震惊)手势识别器在多大程度上简化了您的代码并减少了怪异现象。

这是 Apple 文档的链接:

http://developer.apple.com/library/ios/#documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/GestureRecognizers/GestureRecognizers.html