显示UILabel *秒;除了NSTimer之外的其他方式？ [英] Show a UILabel for * seconds; other ways than with NSTimer?

问题描述

是否有其他方式显示对象/按钮/等等，例如3秒比使用NSTimer？

我可以使用动画来执行此操作吗？

Are there any other way of displaying an object/button/whatever,for example 3 seconds than with an NSTimer?
Could I use an animation to do this?

推荐答案

你可以使用 -performSelector：withObject：afterDelay：，虽然它在内部使用了一个计时器。

You may use -performSelector:withObject:afterDelay:, though it uses a timer internally.

[theLabel performSelector:@selector(removeFromSuperview) withObject:nil afterDelay:3];

您无法使用 -setHidden：方法，因为 1 不是对象，但您可以使用 NSInvocation 。

You cannot use -setHidden: with this method because 1 is not an object, but you can use NSInvocation.

NSInvocation* invoc = [NSInvocation invocationWithMethodSignature:[theLabel methodSignatureForSelector:@selector(setHidden:)]];
[invoc setTarget:theLabel];
[invoc setSelector:@selector(setHidden:)];
BOOL yes = YES;
[invoc setArgument:&yes atIndex:2];
[invoc performSelector:@selector(invoke) withObject:nil afterDelay:3];

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