Ios – Detecting touches on a UISlider

cocoa-touchiosobjective cuisliderxcode

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

but this did not work when ending touches on a slider.

Best Answer

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

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

or

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

If you want to detect both types of the touchesEnd event, use

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

Related Solutions

Objective-c – How todentify a touch/tap on an iPhone screen

The tap events are handled not by the touches method callbacks in UIView, but as targets-actions in UIControl. UIControl is a subclass of UIView, and adds abstractions for taps, drags and other common user actions, so that you do not need to implement the logic yourself.

To add a action for the user tapping a control simply do this:

[myControl addTarget:self
              action:@selector(didSelectFoo:) 
           forEvents:UIControlEventTouchUpInside];

This is usable both if you subclass UIControl yourself, or if you use any of the provided controls such as UIButton, UITextField, UILabel, etc.

Best Answer

or

Related Solutions

Objective-c – How todentify a touch/tap on an iPhone screen

Related Topic