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 »
Swift closures is a kind of code block which can be used as a function, function return type or other function’s parameters. It can has parameters and return values, or it can also do not has parameter and return nothing. It make writing swift code clean and clear, it can save a lot of coding …
Switch case is a powerful condition check expression which exist in many programming languages. But in swift, switch case expression add some useful features in usage, it provide more powerful usage than other programming language. This article will show you some swift switch case usage examples to show the differences.
Swift dictionary is used to store key value pair data. The stored key and value data type should be consistent. The key value data type can be declared at the dictionary variable declaration time, or the data type can be identified by the data assigned to the dictionary variable at run time. This article will …
Swift array can only store same data type values. When you declare a swift array, you had better specify the array element data type at declaration time. But if you do not specify the array element data type when declare it, it can be analyzed by the assigned data value type. And when you want …
