How To Change The Navigation Bar Title Based On A Tap

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In iOS xiv, SwiftUI has a mode to customize a navigation bar championship view with a new toolbar modifier. This is the same affair every bit setting navigationItem.titleView in UIKit.

To customize a navigation bar championship view in SwiftUI, we simply set ToolbarItem of placement type .principal to a new toolbar modifier.

                                    NavigationView              {              // <1>                        
                          Text              (              "Hello, SwiftUI!"              )                        
                          .              navigationBarTitleDisplayMode              (              .inline)                        
                          .toolbar              {              // <2>                        
                          ToolbarItem              (placement:              .principal)              {              // <3>                        
                          VStack              {                        
                          Text              (              "Title"              )              .              font              (              .headline)                        
                          Text              (              "Subtitle"              )              .              font              (              .subheadline)                        
                          }                        
                          }                        
                          }                        
                          }

<i> Because this is a customize of navigation bar title, a view needs to be embedded inside a NavigationView.
<ii> Set .toolbar modifier to a root view of NavigationView.
<3> Set ToolbarItem of placement type .principal with content that y'all want to prove as a championship view.

The above code would produce this in SwiftUI.

This isn't restricted to just text; you tin use an epitome or button in the championship view.

The following example uses SF Symbols in a title view.

                                    NavigationView              {                        
                          Text              (              "Howdy, SwiftUI!"              )                        
                          .              navigationBarTitleDisplayMode              (              .inline)                        
                          .toolbar              {                        
                          ToolbarItem              (placement:              .principal)              {                        
                          HStack              {                        
                          Image              (systemName:              "sunday.min.fill"              )                        
                          Text              (              "Title"              )              .              font              (              .headline)                        
                          }                        
                          }                        
                          }                        
                          }

The post-obit case uses a button in a championship view.

                                    NavigationView              {                        
                          Text              (              "Howdy, SwiftUI!"              )                        
                          .              navigationBarTitleDisplayMode              (              .inline)                        
                          .toolbar              {                        
                          ToolbarItem              (placement:              .chief)              {                        
                          VStack              {                        
                          Text              (              "Title"              )              .              font              (              .headline)                        
                          Push              (              "Subtitle"              )              {                        
                                    
                          }                        
                          }                        
                          }                        
                          }                        
                          }

Custom title view with a button — Custom title view with a push

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titleView
ToolbarItem
toolbar(items:)

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