iOS：UISwipeGestureRecognizer

Question

我有这样的代码：

UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(rightSwipeHandle:)];
[recognizer setNumberOfTouchesRequired:1];
[n16 addGestureRecognizer:recognizer];
[n17 addGestureRecognizer:recognizer];

- (void)rightSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer{
NSLog(@"SWIPE");
}

我怎样才能知道什么视图发生了手势？视图为 n16 和 n17

Answer 1

我不确定您是否可以将相同的 UIGestureRecognizer 实例注册到不同的视图，但如果可以，我认为 UIGestureRecognizer.view 属性就是您正在寻找的。

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIGestureRecognizer_Class/Reference/Reference.html#//apple_ref/occ/cl/UIGestureRecognizer

所以，你应该能够做这样的事情。 （同样，我不确定您是否可以将不同的 UIGestureRecognizer 实例附加到不同的视图......）

- (void)rightSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer{
    if(gestureRecognizer.view == n16)
    {
        // specific operation to n16
    } 
    else if(gestureRecognizer.view == n17)
    {
        // specific operation to n17
    }
}

Answer 2

像这样：

- (void)rightSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer {
    NSLog(@"SWIPE");
    UIView *vw = [gestureRecognizer view]; // this is the view that generated the
        // gesture - either n16 or n17
}