Objective-C中有没有任何方法可以找到触摸开始和触摸结束之间的时间？
// add this ivar to your view controller
NSTimeInterval lastTouch;
// assign the time interval in touchesBegan:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
{
lastTouch = [event timestamp];
}
// calculate and print interval in touchesEnded:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
{
NSTimeInterval touchBeginEndInterval = [event timestamp] - lastTouch;
NSLog(@"touchBeginEndInterval %f", touchBeginEndInterval);
}
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