A swift view can have subviews, the subview can have it’s own subview also. So you can implement a view tree in swift, all the subviews are saved in a subview array, later added subview will override previously added subview. This article will show you an example to tell you how to add, insert, move […]
How To Add, Insert, Move, Remove Sub View In iOS Swift Read More »
When I develop an iOS example application use swift, I meet a strange situation. When I click the run button to start my iOS example, it runs well. My example iOS app has a button, so I click it to trigger a Touch Up Inside event for this button, but this action makes my iOS
How To Fix Swift Unrecognized Selector Sent To Instance Error Read More »
When we develop iOS app use Xcode, we design the app GUI ( graphical user interface ) in Main.storyboard file. And the swift source code is edited in ViewController.swift file. But how to use swift source code in ViewController.swift file to modify storyboard UI component’s attributes or process UI component’s action event? This article will
How To Connect Storyboard UI Component To ViewController Class Code Read More »
This article will tell you what is Xcode Library, Assistant Editor, and Inspector. It will also tell you how to display Xcode Library, Assistant Editor, and Inspector window when you need them. Because for Xcode beginners, you may find you can not find them at some time.
How To Display Xcode Library, Assistant Editor, Inspectors Window Read More »
In the previous article How To Draw Rectangle View Use Swift In the iOS App we have learned how to draw a rectangle, how to set the rectangle background color, and how to add the rectangle as the subview of the iOS app’s main view. But when we set the rectangle background color, we use
How To Set iOS UIView Background With Customized Color Or Image In Swift Read More »
There are three kinds of variable declaration in swift programming. You can declare a swift variable as a variable (var name: String = “jerry”) that value can be changed in code, a constant ( let x:Int = Int(10) ) that value can not be changed, and an optional variable ( var x:Int? ) that value
How To Fix Error ‘Value Of Optional Type Must Be Unwrapped To A Value Of Type’ In Swift Read More »
iCloud is a very good place for you to save your iOS device documents ( such as photos, videos, audios, etc ) in the cloud. This service can make your documents never lost. So when we take a picture with iPhone, the picture will be synced to iCloud and then sync to every device that
How To Keep Photos Saved In iCloud When Delete From iPhone Read More »
When you develop an iOS application, sometimes you may need to create a SubView and add it into the iOS root view object programmatically. This article will just show you an example about how to do it.
How To Add Subview In iOS Programmatically Read More »
When you add a UI component such as a button in the interface builder of the Xcode project, you can adjust it’s position by hand. For example, you place the button at the center position both horizontally and vertically. But when you preview the screen on different devices or in different screen orientations. You will
iOS Auto Layout With Constraint Example Read More »