在我的应用程序中,我想显示不同的ViewControllers,具体取决于用户是否已登录。就像用户登录当前VC_A一样,如果没有,则显示VC_B。我在vc_login中尝试了以下代码:
if let user = FIRAuth.auth()?.currentUser {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "vc_home") as! ViewController_Home
self.present(vc, animated: true, completion: nil)
} else {
// Do Nothing
}
答案 0 :(得分:1)
你可以这样做(提示在代码注释中):
if FIRAuth.auth()?.currentUser?.uid == nil {
// user is not logged in
// present VC_B
} else {
// user is logged in
// present VC_A
}
或者你可以像这样使用三元条件运算符:
FIRAuth.auth()?.currentUser?.uid == nil ? presentViewControllerB() : presentViewControllerA()
func presentViewControllerA() {
// call if logged in
}
func presentViewControllerB() {
// call if not logged in
}