ios NSTimer - 如何在 Swift 中延迟
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NSTimer - how to delay in Swift
提问by Dandy
I have a problem with delaying computer's move in a game.
我有延迟计算机在游戏中移动的问题。
I've found some solutions but they don't work in my case, e.g.
我找到了一些解决方案，但它们在我的情况下不起作用，例如
var delay = NSTimer.scheduledTimerWithTimeInterval(4, target: self, selector: nil, userInfo: nil, repeats: false)
I tried to use this with function firebut also to no effects.
我试图将它与函数一起使用，fire但也没有任何效果。
What other possibilities there are?
还有哪些可能性？
回答by valfer
Swift 3
斯威夫特 3
With GCD:
使用 GCD：
let delayInSeconds = 4.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delayInSeconds) {
// here code perfomed with delay
}
or with a timer:
或使用计时器：
func myPerformeCode() {
// here code to perform
}
let myTimer : Timer = Timer.scheduledTimer(timeInterval: 4, target: self, selector: #selector(self.myPerformeCode), userInfo: nil, repeats: false)
Swift 2
斯威夫特 2
With GCD:
使用 GCD：
let seconds = 4.0
let delay = seconds * Double(NSEC_PER_SEC) // nanoseconds per seconds
let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(dispatchTime, dispatch_get_main_queue(), {
// here code perfomed with delay
})
or with a timer:
或使用计时器：
func myPerformeCode(timer : NSTimer) {
// here code to perform
}
let myTimer : NSTimer = NSTimer.scheduledTimerWithTimeInterval(4, target: self, selector: Selector("myPerformeCode:"), userInfo: nil, repeats: false)
回答by eharo2
With Swift 4.2
使用 Swift 4.2
With TimerYou can avoid using a selector, using a closure instead:
WithTimer你可以避免使用选择器，而是使用闭包：
Timer.scheduledTimer(withTimeInterval: 1.0, repeats: false) { (nil) in
// Your code here
}
Keep in mind that Timeris toll-free bridged with CFRunLoopTimer, and that run loops and GCD are two completely different approaches.... e
请记住，这Timer是免费桥接的CFRunLoopTimer，并且运行循环和 GCD 是两种完全不同的方法....e
回答by Ramakrishna
In swift we can delay by using Dispatch_after.
在 swift 我们可以延迟使用 Dispatch_after.
SWift 3.0 :-
斯威夫特 3.0 :-
DispatchQueue.main.asyncAfter(deadline: .now()+4.0) {
alert.dismiss(animated: true, completion: nil)
}
回答by JSA986
How about using Grand Central Dispatch?
使用 Grand Central Dispatch 怎么样？
Valfer has shown you how
Valfer 向您展示了如何
