update

Weibo/ContentView.swift

@@ -19,21 +19,14 @@ struct ContentView: View {
     @State var selection=2
 
     
-    
     var body: some View {
         TabView(selection: self.$selection) {
-            if self.user.access_token==nil{
+            if (self.user.access_token != nil){
                 IndexView().tabItem { VStack {
                     Image("house")
                     Text("首页")
                         .foregroundColor(Color.black)
-                    } }.tag(1).hidden()
-            }else{
-               IndexView().tabItem { VStack {
-                                 Image("house")
-                                 Text("首页")
-                                     .foregroundColor(Color.black)
-                                 } }.tag(1)
+                    } }.tag(1)
             }
             
             LoginView().tabItem { VStack {

Weibo/LoginView.swift

@@ -86,12 +86,12 @@ struct UserView:View {
     var body:some View{
         VStack {
             HStack {
-                ImageView(imageUrl: self.user.avatar_hd!)
+                ImageView(imageUrl: self.user.avatar_hd ?? "")
                 .frame(width: 60.0, height: 60.0)
                 .clipShape(/*@START_MENU_TOKEN@*/Circle()/*@END_MENU_TOKEN@*/)
                 VStack {
                     Text(self.user.name!)
-                    Text("简介:\(self.user.desc!)")
+                    Text("简介:\(self.user.desc ?? "")")
                 }
                 Spacer()
                 Button(action: {