我正尝试在Config.swift文件中创建uialertcontroller，如下所示。staticfuncshowAlertMessage(titleStr:String,messageStr:String)->Void{letwindow:UIWindow?letalert=UIAlertController(title:titleStr,message:messageStr,preferredStyle:UIAlertControllerStyle.Alert);self.window!.presentViewController(alert,animated:true,com

我正尝试在Config.swift文件中创建uialertcontroller，如下所示。staticfuncshowAlertMessage(titleStr:String,messageStr:String)->Void{letwindow:UIWindow?letalert=UIAlertController(title:titleStr,message:messageStr,preferredStyle:UIAlertControllerStyle.Alert);self.window!.presentViewController(alert,animated:true,com