UIButton 删除所有目标动作-移动开发问题

UIButton remove all target-actions(UIButton 删除所有目标动作)

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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.

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.

这可能吗?我该怎么做?

Is this possible and how do I go about it?

推荐答案

调用removeTarget:action:forControlEvents:，为目标传递 nil，为操作传递 NULL，并使用设置所有位的控制掩码 (UIControlEventAllEvents).

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];

斯威夫特 2

button.removeTarget(nil, action: nil, forControlEvents: .AllEvents)

Swift 3 或更高版本

button.removeTarget(nil, action: nil, for: .allEvents)

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