By Apple Inc.
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Additional resources for Using Swift with Cocoa and Objective-C
Sample text
In Swift, you can use optional chaining to invoke an optional protocol method on a possibly nil object and unwrap the possible result using if–let syntax. The code listing below illustrates the following process: Check that myDelegate is not nil. Check that myDelegate implements the method window:willUseFullScreenContentSize:. If 1 and 2 hold true, invoke the method and assign the result of the method to the value named fullScreenSize. Print the return value of the method. Swift class MyDelegate: NSObject, NSWindowDelegate { func window(NSWindow, willUseFullScreenContentSize proposedSize: NSSize) -> NSSize { return proposedSize } } var myDelegate: NSWindowDelegate?
Text = "Hello world" When getting or setting a property, use the name of the property without appending parentheses. Notice that darkGrayColor has a set of parentheses. This is because darkGrayColor is a class method on UIColor, not a property. In Objective-C, a method that returns a value and takes no arguments can be treated as an implicit getter—and be called using the same syntax as a getter for a property. This is not the case in Swift. In Swift, only properties that are written using the @property syntax in Objective-C are imported as properties.
For example, a Swift array of type [Int] contains Int structure elements. The Int type is not an instance of a class, but because the Int type bridges to the NSNumber class, the Int type is AnyObject compatible. Therefore, you can bridge a Swift array of type [Int] to an NSArray object. If an element in a Swift array is not AnyObject compatible, a runtime error occurs when you bridge to an NSArray object. You can also create an NSArray object directly from a Swift array literal, following the same bridging rules outlined above.
Using Swift with Cocoa and Objective-C by Apple Inc.
by Mark
4.0