调用函数的问题

Question

我有一个 UIView，它有一个 UIScrollView 作为子视图，而它又有一个 UIImageView 作为它的子视图。我也可以缩放。但我想在双击时调用另一个函数。我正在使用此代码：

- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view 
{
     if(view == scrollView)
     {
        UITouch *touch = [touches anyObject];
        if([touch tapCount]== 2)
        {
           [self setViewForProductDispaly];
           return YES;
        }

      }
 return NO;

}

当我点击它时，上面的方法没有被调用。这可能是什么原因。

我的滚动视图

scrollView.hidden=NO;
scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0.0, 0.0,self.bounds.size.width,self.bounds.size.height )];

scrollView.maximumZoomScale = 3.0;
scrollView.indicatorStyle = UIScrollViewIndicatorStyleBlack;
scrollView.delegate =self;
scrollView.bouncesZoom = YES;
scrollView.delaysContentTouches=NO;


bigImageView.autoresizesSubviews = YES;
bigImageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
bigImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 0.0, bigImg.size.width, bigImg.size.height)];
bigImageView.image = bigImg;
bigImageView.userInteractionEnabled = YES;

[scrollView addSubview:bigImageView];
[bigImageView release];

[self addSubview:scrollView];
[scrollView release];

Answer 1

最好将 UIGestureRecogizers 用于双击等基本手势：

UITapGestureRecognizer *doubleTapGestureRecognizer = [[UITapGestureRecognizer alloc]
                        initWithTarget:self action:@selector(handleDoubleTap:)];

doubleTapGestureRecognizer.numberOfTapsRequired = 2;
[self.scrollView addGestureRecognizer:doubleTapGestureRecognizer];

在您的handleDoubleTap: 函数中，您可以调用任何您想要的方法。

Answer 2

看起来 bigImageView 在添加到它时正在拉伸以适应 scrollView。所以，您的方法没有被调用，因为您实际上是在点击 bigImageView，而不是 scrollView。