在这种情况下,timerFunc()从未被调用。我缺少什么? 
  
  
 
class AppDelegate: NSObject,NSApplicationDelegate {
    var myTimer: NSTimer? = nil
    func timerFunc() {
        println("timerFunc()")
    }
    func applicationDidFinishLaunching(aNotification: NSNotification?) {
        myTimer = NSTimer(timeInterval: 5.0,target: self,selector:"timerFunc",userInfo: nil,repeats: true)
    }
}
 您可以创建一个自动将自己添加到runloop并开始启动的计划定时器: 
  
  
 
                    
                    
                NSTimer.scheduledTimerWithTimeInterval(0.5,selector: "timerDidFire:",userInfo: userInfo,repeats: true)
或者,你可以保留你当前的代码,并添加定时器runloop当你准备好了:
let myTimer = NSTimer(timeInterval: 0.5,repeats: true) NSRunLoop.currentRunLoop().addTimer(myTimer,forMode: NSRunLoopCommonModes)