ios - UIScrollView、PanGestureRecognizer 和 iOs 4

Question

我有一个可滚动的 View ，我需要无需滚动主视图即可触发的手势识别器。

我用过这段代码:

UISwipeGestureRecognizer *upRecognizer = 
    [[UISwipeGestureRecognizer alloc] initWithTarget:self 
                                              action:@selector(upSwipeHandle:)];
upRecognizer.direction = UISwipeGestureRecognizerDirectionUp;
[upRecognizer setNumberOfTouchesRequired:2];
[controller.view addGestureRecognizer:upRecognizer];
[[controller.scrollView panGestureRecognizer]
    requireGestureRecognizerToFail:upRecognizer];

但它似乎只适用于 iOS 5。我如何在 iOS 4 中使用相同的识别器？

Answer 1

我使用 UIGestureRecognizer 委托(delegate)方法解决了我的问题。

添加

upRecognizer.delegate = self;

和这个方法:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

    if ([gestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]] && [otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
        return YES;
    }

    return NO;
}