ios - UIViewController 未收到 touchesBegan 消息

Question

我的 UIViewController 中有一个 UIScrollView。我需要检测对它的任何触摸，然后做一些事情。我还需要什么？

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"TOUCHED"); // never happens
    for (UITouch *touch in touches) {
        if ( [touch view] == self.myScrollView)
        {
            //do something
        }
    } 
}

Answer 1

两种选择:

1. 子类化 UIScrollView 并实现您的 touchesBegan[...] 代码那里
2. 将 UIView 添加到您的 UIScrollView 并使用 UIView 的 touchesBegan[...] 委托(delegate)方法