Code with Objective C & Swift

2014-06-22 Kommentare IOS

最近一時手癢，想說 Swift 可以與 Objective-C 混合使用，立馬參照官方作法Swift and Objective-C in the Same Project以及Swift Type Compatibility

當我使用純Swift物件時，執行狀況並不如預期順利，在 Stack Overflow 的這篇提供了相當不錯的解法

How to call Objective C code from Swift

Using PURE Swift Classes in Objective-C

Step 1 Create New Swift Class

PureSwiftObject.swift
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import Foundation

// Note '@objc' prefix
@objc class PureSwiftObject {

    var name: String
    init(name: String) {
        self.name = name
    }

    // Needed to add a class level initializer
    class func newInstanceNamed(name: String) -> PureSwiftObject {
        return PureSwiftObject(name: name)
    }

    // Just a method for demonstration
    func someMethod() {
        println("Some method ran in pure swift object")
    }
}

Step 2 Import Swift Files to ObjC Class

In SomeRandomClass.m:

#import "<#YourProjectName#>-Swift.h"

Step 3 Use your pure swift class

PureSwiftObject.swift
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PureSwiftObject * pureSwiftObject = [PureSwiftObject newInstanceNamed:@"Janet"];
NSLog(@"PureSwiftNamed: %@", pureSwiftObject.name);
[pureSwiftObject someMethod];
#IOS #Objective-c #Swift