xcode

问题 Currently, my AppDelegate file contains this code to establish the CustomTabBarController as the rootViewController: window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = CustomTabBarController() I want my app to always have the CustomTabBarController on the bottom, but I want each tab to have a navigation controller. Here is the code I used to set up my tabBarController: class CustomTabBarController: UITabBarController { override func

问题 Currently, my AppDelegate file contains this code to establish the CustomTabBarController as the rootViewController: window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = CustomTabBarController() I want my app to always have the CustomTabBarController on the bottom, but I want each tab to have a navigation controller. Here is the code I used to set up my tabBarController: class CustomTabBarController: UITabBarController { override func

问题 Currently, my AppDelegate file contains this code to establish the CustomTabBarController as the rootViewController: window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = CustomTabBarController() I want my app to always have the CustomTabBarController on the bottom, but I want each tab to have a navigation controller. Here is the code I used to set up my tabBarController: class CustomTabBarController: UITabBarController { override func

问题 Currently, my AppDelegate file contains this code to establish the CustomTabBarController as the rootViewController: window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = CustomTabBarController() I want my app to always have the CustomTabBarController on the bottom, but I want each tab to have a navigation controller. Here is the code I used to set up my tabBarController: class CustomTabBarController: UITabBarController { override func

问题 Currently, my AppDelegate file contains this code to establish the CustomTabBarController as the rootViewController: window = UIWindow(frame: UIScreen.main.bounds) window?.makeKeyAndVisible() window?.rootViewController = CustomTabBarController() I want my app to always have the CustomTabBarController on the bottom, but I want each tab to have a navigation controller. Here is the code I used to set up my tabBarController: class CustomTabBarController: UITabBarController { override func

问题 I have an app that allows users to save favorites. I am using Core Data to store the favorites as managed objects. I have written some code to prevent the possibility of storing duplicates, but am wondering if there is a better way to do so. Each favorite object has an ID field that is unique. In the following code I am simply looping through and checking the ID field, and if the value already exists, setting a flag value to true, and breaking out of the loop. -(BOOL)addFavorite{ BOOL

问题 I have an app that allows users to save favorites. I am using Core Data to store the favorites as managed objects. I have written some code to prevent the possibility of storing duplicates, but am wondering if there is a better way to do so. Each favorite object has an ID field that is unique. In the following code I am simply looping through and checking the ID field, and if the value already exists, setting a flag value to true, and breaking out of the loop. -(BOOL)addFavorite{ BOOL

问题 I have an app that allows users to save favorites. I am using Core Data to store the favorites as managed objects. I have written some code to prevent the possibility of storing duplicates, but am wondering if there is a better way to do so. Each favorite object has an ID field that is unique. In the following code I am simply looping through and checking the ID field, and if the value already exists, setting a flag value to true, and breaking out of the loop. -(BOOL)addFavorite{ BOOL

问题 CMake was able to configure automatic code signing for XCode <=7 and iOS projects with a target property setting like set_target_properties(app PROPERTIES XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "PROPER IDENTIFIER") XCode 8 changed the signing process. It now is required that the option "Automatically manage signing" in the project settings "General tab -> Signing" is checked. If I check this options manually for a cmake generated project, signing works well. But I did not find a way to enable

问题 Just playing with Swift UI basic app and the preview canvas is not showing even though I'm in canvas mode. App runs, and I have this little snippet what am I missing? #if DEBUG struct ContentView_Previews : PreviewProvider { static var previews: some View { ContentView() } } #endif 回答1: To preview and interact with views from the canvas in Xcode, ensure your Mac is running on Catalina MacOS . https://developer.apple.com/tutorials/swiftui/creating-and-combining-views Please check apple