为什么performSelector不存在于swift中 [英] why is performSelector not present in swift

问题描述

显然以下内容在swift中不再可用：

apparently the following is not available in swift anymore:

[self performSelector:@selector(onFlip) withObject:nil afterDelay:0.3];

如果以下情况仍然存在，为什么会这样：

why is this the case if the following is still present:

NSObject.cancelPreviousPerformRequestsWithTarget(self, selector: singleTapSelector, object: nil)

nsobject.cancel不能与performSelector一起使用吗？为什么有取消功能而不是执行功能？

doesn't nsobject.cancel work with performSelector? why have the cancel functionality but not the perform functionality?

推荐答案

使用

NSTimer.scheduledTimerWithTimeInterval(delay, target: self, selector: "onFlip", userInfo: nil, repeats: false)

。不知道为什么另一个不可用。

instead. No idea why the other one is not available.

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