UIButton删除所有目标操作 [英] UIButton remove all target-actions
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问题描述
我已将多个target-action-forControlEvents:添加到UIButton。我想一次性删除所有这些,而不释放任何东西。然后我会设定新的目标。
这是否可行,我该怎么做?
解决方案
致电 removeTarget:动作:forControlEvents:时,通过零为目标,为NULL动作,并使用该设置所有位(UIControlEventAllEvents)的控制掩模<。 / p>
Objective-C
[someControl removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
Swift 2
button.removeTarget(nil,action:nil,forControlEvents:.AllEvents)
Swift 3
button.removeTarget(nil,action:nil,for :。allEvents)
I have added multiple target-action-forControlEvents: to a UIButton. I'd like to remove all of these in one go without deallocating anything. I will then set new targets.
Is this possible and how do I go about it?
解决方案
Call removeTarget:action:forControlEvents:, pass nil for the target, NULL for action, and use a control mask that sets all bits (UIControlEventAllEvents).
Objective-C
[someControl removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
Swift 2
button.removeTarget(nil, action: nil, forControlEvents: .AllEvents)
Swift 3
button.removeTarget(nil, action: nil, for: .allEvents)
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