Question

我有一个滚动视图和一个放在它上面的按钮，当我添加一个点击手势识别器时按钮不起作用。有没有办法限制点按仅滚动视图而不是按钮，这样按钮功能正常。

这是我的代码

UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
tap.numberOfTapsRequired = 1;
tap.numberOfTouchesRequired = 1;
[scroll addGestureRecognizer:tap];
[tap release];


- (void)tapGesture:(UIGestureRecognizer*)gesture{


NSLog(@"scroll tapped");

}

Answer 1

如果你这样做

tap.cancelsTouchesInView = NO;

它将允许按下按钮。但是，当您按下按钮时，将同时按下按钮检测到水龙头。要避免这种情况，您必须继承UIScrollView并实现以下方法 -

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    for ( UIView * subview in self.subviews ) {
        UIView * hitView = [subview hitTest:point withEvent:event];
        if ( hitView )
            return hitView;
    }

    return [super hitTest:point withEvent:event];
}

实现上述方法会将触摸传递给滚动视图的子视图。

Answer 2

无需子类化Scrollview。以下代码轻松解决了问题。方法 gestureRecognizer：shouldReceiveTouch：可以解决问题。

UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
tap.numberOfTapsRequired = 1;
tap.numberOfTouchesRequired = 1;
tap.delegate = self;
tap.cancelsTouchesInView = NO;
[scroll addGestureRecognizer:tap];
[tap release];

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if (scroll.superview != nil) {
        if ([touch.view isKindOfClass:[UIButton class]])
        {
            return NO; // ignore the touch
        }
    }
    return YES; // handle the touch
}

- (void)tapGesture:(UIGestureRecognizer*)gesture {
    NSLog(@"scroll tapped");
}

将点击手势限制为滚动视图而不是放置在其上的按钮

2 个答案: