How To Call Objective C Code From Swift Project
When you develop iOS app use swift, if you have some older function wrote by objective-c language, you can use Objective-C bridging header file to import your objective-c header files […]
iOS Tutorial
How To Create Xcode Workspace And Add New / Exist Project Into It
Xcode use workspace and project to manage swift source code. When you develop an iOS app, you should first create a workspace, and then create and add new project into […]
iOS Swift Function External And Internal Parameter Name Example
When we define a swift function, we can provide function parameters to it, and each function parameter can has an external name and an internal name. External name is used […]
How To Add iOS App Icon, Image, Color Set To Xcode Project Assets Catalog Correctly
Xcode project organize project resource files use Asset Catalog. Each asset catalog can contain multiple asset sets, for example app icon set, image set, color set etc. When you create […]
How To Change Swift Constraints To Make Autolayout Programmatically
In previous article, we have learnt how to change swift constraints use auto layout tool bar visually ( How To Add Constraints In Xcode 10 To Implement Auto Layout ). […]
How To Fix Swift Error LayoutConstraints Unable To Simultaneously Satisfy Constraints
When i add swift constraints to button programmatically in source code, i meet an error message like this. [LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the […]
How To Make Swift Buttons Auto Layout To Full Fill Screen Width Responsively In iOS
In previous article How To Add Constraints In Xcode 10 To Implement Auto Layout, we have learnt what is swift constraints, how to use it to pin a ui component […]
How To Add Constraints In Xcode 10 To Implement Auto Layout
When you develop iOS app use swift, you can make ui component fixed size. But iOS devices has different screen size, so fixed size UI component will render differently on […]
How To Prompt Alert Dialog When Click A Button In Swift
How To Change Swift Button Title Text, Background Color, Size, Position In Main Storyboard Use Xcode Attributes Inspector
When you develop iOS app in swift, you can create and set UI component’s attributes both in swift source code and use Xcode attributes inspector. We have learnt how to […]
