1.perform(必须在主线程中执行)
self.perform(#selector(delayExecution), with: nil, afterDelay: 3)
// 取消
NSObject.cancelPreviousPerformRequests(withTarget: self)
2.timer(必须在主线程中执行)
Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(delayExecution), userInfo: nil, repeats: false)
3.Thread (在主线程会卡主界面)
Thread.sleep(forTimeInterval: 3)
self.delayExecution()
4.GCD 主线程/子线程
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
self.delayExecution()
}
DispatchQueue.global().asyncAfter(deadline: .now() + 3) {
self.delayExecution()
}
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