Swift PerformSelector:withObject:afterDelay:不可用 [英] Swift performSelector:withObject:afterDelay: is unavailable

问题描述

我在Objective C中有一个正在过渡到Swift的应用程序.在目标C中，我有以下方法:

I have an app in Objective C that I'm transitioning to Swift. In Objective C, I have this method:

[self.view performSelector:@selector(someSelector) withObject:self afterDelay:0.1f];

我正在使用Swift，但我不知道如何做到这一点.我尝试过:

I'm working with Swift and I can't figure out how to do this. I've tried:

self.view.performSelector(Selector("someSelector"), withObject: self, afterDelay: 0.1)

这是我得到的错误:'performSelector' is unavailable: 'performSelector' methods are unavailable

我将使用什么调用来调用方法afterDelay?

What call would I use to call a method afterDelay?

更新

这就是我最终得到的:

extension NSObject {

    func callSelectorAsync(selector: Selector, object: AnyObject?, delay: NSTimeInterval) -> NSTimer {

        let timer = NSTimer.scheduledTimerWithTimeInterval(delay, target: self, selector: selector, userInfo: object, repeats: false)
        return timer
    }

    func callSelector(selector: Selector, object: AnyObject?, delay: NSTimeInterval) {

        let delay = delay * Double(NSEC_PER_SEC)
        let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
        dispatch_after(time, dispatch_get_main_queue(), {
            NSThread.detachNewThreadSelector(selector, toTarget:self, withObject: object)
        })
    }
}

推荐答案

Swift 4

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
    // your function here
}

快捷键3

DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(0.1)) {
    // your function here
}

快捷键2

let dispatchTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(0.1 * Double(NSEC_PER_SEC))) 
dispatch_after(dispatchTime, dispatch_get_main_queue(), { 
    // your function here 
})

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