C#和php都有sleep让线程休眠指定时间后再继续执行后面的代码,swift中应该如何呢?
首先,找一下objective-c版本是怎么做的
[self performSelector:@selector(didTimeOut:) withObject:nil afterDelay:60];
// 顺便演示下取消
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didTimeout:) object:nil]
经过查找,swift中可以这么做:
var timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("someSelector"), userInfo: nil, repeats: false)
func someSelector() {
// Something after a delay
}
或者这样:
var delta: Int64 = 1 * Int64(NSEC_PER_SEC)
var time = dispatch_time(DISPATCH_TIME_NOW, delta)
dispatch_after(time, dispatch_get_main_queue(), {
println("closures are " + txt)
resolve()
});
// 当然没这么恐怖,time可以直接传数字时间
dispatch_after(1, dispatch_get_main_queue(), {
// your function here
})
按C#的Threading.Thread.sleep(5000)
的写法,swift中有:
NSThread.sleepForTimeInterval(3)
可实际上,一个跟php完全一样的用法是完全可行的:
sleep(3)