ios - 快速执行选择器 :withObject:afterDelay: is unavailable

Question

这个问题在这里已经有了答案:

dispatch_after - GCD in Swift? (26 个回答)

关闭 8年前。

我有一个 Objective-C 中的应用程序，我正在过渡到 Swift。在Objective C中，我有这个方法:

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

我正在使用 Swift，但我不知道该怎么做。我试过了:

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

这是我得到的错误:'performSelector' 不可用:'performSelector' 方法不可用

我会使用什么调用来调用方法afterDelay？

更新

这就是我最终得到的结果:

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)
        })
    }
}

Answer 1

swift 4

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

swift 3

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

swift 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 
})