Swift3 使用系统UIAlertView方法做吐司效果

    

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/**   *显示弹出信息   */  class func showAlertMessage(_ str:String,showtime Num:Double){             let alert = UIAlertView(title: str, message: nil, delegate: nil, cancelButtonTitle: nil);      alert.show()      //        self.performSelector(#selector(dismissAlert(_:)), withObject: alert, afterDelay: Num)      let dispatchTime: DispatchTime = DispatchTime.now() + Double(Int64(0.10 * Num * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)      DispatchQueue.main.asyncAfter(deadline: dispatchTime, execute: {          dismissAlert(alert)      })  }     class func dismissAlert(_ alert:UIAlertView){      alert.dismiss(withClickedButtonIndex: alert.cancelButtonIndex, animated: true)  }