为什么在shouldReceiveTouch中我的手势识别器总是报告在同一位置被轻击？

Question

我有以下代码:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)recognizer shouldReceiveTouch:(UITouch *)touch {
    NSLog(@"%@", NSStringFromCGPoint([recognizer locationInView:self.view]));
    ...

然而,每当我点击时,我都会得到{0, -64}.无论我在哪里点击.我究竟做错了什么？

Answer 1

我认为这是预期的行为,因为"在touchesBegan之前调用此方法:在手势识别器上调用withEvent:以获得新的触摸".所以,我认为这意味着识别器还不会知道它的位置.要获取位置,请使用提供的touch参数:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)recognizer shouldReceiveTouch:(UITouch *)touch {
    NSLog(@"%@", NSStringFromCGPoint([touch locationInView:self.view]));
    ...