Category development

Let’s learn Set in Swift language

Set is different from Array. Array is ordered. By the way Set isn’t. Another different thing is Array can have same elements. For example, let ar1 = [1, 1, 1, 1] The code above is possible in Array. But you…

iOS Application States

There are three questions for distinguishing app states. Is the app possible to execute codes? Is the app visible? Is the app possible to get events? When app on iOS does enters a state? Active: User launches an app. Inactive:…