检测UISlider上的触摸？ [英] Detecting touches on a UISlider?

问题描述

我有一个UISlider在屏幕上，我需要能够检测什么时候用户停止触摸它。

I have a UISlider on screen, and I need to be able to detect when the user stops touching it. (so I can fade some elements away).

I have tried using:

> - （void）touchesEnded：（NSSet *）touches withEvent：（UIEvent *）event

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

推荐答案

您可以使用两个控制事件来检测触摸何时结束; try

You can detect when a touch ends using two control events; try

[slider addTarget:self action:@selector(touchEnded:) 
                       forControlEvents:UIControlEventTouchUpInside];

或

or

[slider addTarget:self action:@selector(touchEnded:) 
                       forControlEvents:UIControlEventTouchUpOutside];

如果要检测 touchesEnd 事件，使用

[slider addTarget:self action:@selector(touchEnded:) 
   forControlEvents:UIControlEventTouchUpInside | UIControlEventTouchUpOutside];

这篇关于检测UISlider上的触摸？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！