iOS操作-如何从UIAction获取标准UIButton的事件数据？

Question

对于UIButton来说，在touchDragInside上有什么方法可以判断手势的方向吗？(上、下、左、右)

- (IBAction)buttonTouchedUpInside:(UIButton *)sender forEvent:(UIEvent *)event {
}

谢谢!

Answer 1

您应该对按钮进行子类化，并重写beginTrackingWithTouch:withEvent：、continueTrackingWithTouch:withEvent:和endTrackingWithTouch:withEvent：。我放在下面代码中的日志应该可以让你开始做你想做的事情。

 - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
   NSLog(@"%@",NSStringFromCGPoint([[event.allTouches anyObject] locationInView:self]));
    return YES;
}

- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
    NSLog(@"%@",NSStringFromCGPoint([[event.allTouches anyObject] locationInView:self]));
    return YES;
}

-(void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
    NSLog(@"%@",NSStringFromCGPoint([[event.allTouches anyObject] locationInView:self]));
}

如果您只对整体方向感兴趣，那么您可以只看beginTracking数和endTracking数，而忘记continueTracking方法。