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下面代码的功能是显示登录界面,但是调用instantiateViewController时会出现SIGABRT错误,原因是没有设置Storyboard Id。
func showLoginView(){
//name为Storyboard的文件名
let storyboard=UIStoryboard(name: "LoginViewController", bundle: nil)
//withIdentifier为Storyboard Id
let loginView=storyboard.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
present(loginView,animated: true, completion: nil)
}