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)
})
}
}
最佳答案
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
})
关于ios - 快速执行选择器 :withObject:afterDelay: is unavailable，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24170282/