iOS Tutorial

When you create an iOS app and run it in a simulator, you may find that the default app icon on the screen is a grid picture, this is not beautiful. This article will tell you two methods about how to change the default iOS app icon to your desired icon both in a simulator […]

When I develop and run an iOS app in Xcode iOS simulator ( such as iPhone or iPad ), I find the keyboard does not display automatically when I click the mouse key on a text field or text view UI component like below. This confused me for some time, and finally, I find the

This example will show you how to add a UIButton object and a UILabel object to your iOS app. It will also show you how to add a swift button action process method to handle the button click event to change the label text accordingly when the user clicks the button.

This example will tell you how to use UIActivityIndicatorView class to implement iOS activity indicator both visually ( in the Main.storyboard file ) and programmatically in swift source code. First, let us look at the example demo video below.

When I develop the iOS app user interface, I add one button and one activity indicator in the main storyboard file. Because I want to write swift source code to manage the button and the activity indicator, so I press the Control key and Drag & Drop the button and the activity indicator from the

This article will tell you how to add one button, two buttons, three buttons, and the editable text fields in an iOS alert dialog in swift. The alert button style type can be UIAlertAction.Style.default, UIAlertAction.Style.cancel and UIAlertAction.Style.destructive. Now let us look at the demo picture below.

In my iOS app, I add a UITextField in the Main.storyboard file. When I run the app in the iOS simulator, I find I can not input text in the UITextField use my Mac book pro hardware keyboard. And I find the soft keyboard does not prompt in the iOS simulator when I focus on

WebKit.WKWebView class is used to implement a micro web browser in the iOS app or Mac OS app. It provides several methods to load Html URL pages, local Html files, etc. But when I use it to load and display the Html page in iOS version 9 and later, I find it can not display

When I develop an iOS app, I add a UITextField in the app UI programmatically. And I also add some constraints to the UITextField object in swift source code to make it auto layout. But when I run the app, it throws an exception with the error message ‘NSGenericException’, reason: ‘Unable to activate constraint with