How To Fix Error Use Of Unresolved Identifier ‘RootViewController’ In Xcode Swift Project

When I develop an iOS project in Xcode, I create a custom class RootViewController in RootViewController.swift file, this class is a subclass of UIViewController. But during the development process, when I use this custom class to create an object in another swift file ( for example SceneDelegate.swift ), I meet an error which said Use […]

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How To Fix Error Could Not Find A Storyboard Named ‘Main’ In Bundle NSBundle In Xcode 11.0

When I follow the article How To Create A Swift App Without Storyboard to learn how to create an iOS app without using the storyboard, after I remove the Main.storyboard file and run it. I meet an error message like this Could not find a storyboard named ‘Main’ in bundle NSBundle.

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How To Set Application Root View Controller Programmatically In Xcode 11

When using Xcode 11 to create a new iOS project, if you still create the root view controller in AppDelegate class’s – func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool function as usual, you will find there is a compile time error which said Value of type ‘AppDelegate’ has no member ‘window’. And

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What Is The Difference Between iOS UIView Frame And Bounds

UIKit.UIView class has two properties frame and bounds, they all save the location and size information of the UIView object, but they are different. The difference is that UIView.frame saves the data relative to it’s super view’s coordinate system, and UIView.bounds save the data relative to its own coordinate system. This article will show you an

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