Swift 5 -定时器不发射

Question

我有以下内容，

class someViewController : ViewController{
var timer:Timer? = nil
override func viewDidLoad() {
timer = Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(fire), userInfo: nil, repeats: true)
}
@objc func fire(){
print("fired")
}

}

消防功能从来没有击中，我不知道为什么，我错过了什么?

Answer 1

问题是:计时器需要在主线程上调度:

DispatchQueue.main.async {  
let timer = Timer.scheduledTimer(timeInterval: self.BLINK_TIMEOUT, target: self, selector: #selector(self.clearTimer), userInfo: nil, repeats: false)
}

希望有帮助!