When you develop iOS app use swift in Xcode, the project template commonly create a default UIViewController class defined in ViewController.swift file. This UIViewController class is used as a controller […]
Storyboard is a very easy to use feature in iOS app development. It is visual and user friendly. But in some cases, we need to know the backend of the […]
If you are a beginner of iOS swift programming, you may be confused by some strange swift operator, such as _, !, ?, ??. This article will tell you what […]
When we develop iOS application use Xcode, we always need to get help document of some iOS api library class or method which you do not remember. This article will […]
When you use Mac OS Finder to browse files, you will find it can not display hidden files. This is Mac OS default settings. But this is not user friendly […]
When you view pictures on Mac OS, you may find you can only view one picture at one time. If you want to view another image picture, you should close […]
When you develop iOS app, you sometimes need to simulate memory warning notification to test your iOS app in high memory pressure condition. Xcode simulator just provide such a tool […]
When you develop iOS app, you may want your app support iPhone, iPad only or support both of them. And in some cases, if your UI layout is very complex, […]
When you press iOS device’s home button, you may want your iOS app go to background and resume running later, or you may want your iOS app terminate and exit […]
