Mutual invocation of Swift and OC

Swift after four years of development has become mature, it is time to learn, thank the company Swift Big Brother's generous enlighten. The heart has a sense of record, if there is insufficient to welcome criticism.

New Swift Project

Create a new swift, OC class file

You can create a bridge header file when you create a new OC file, or create a new bridge connector file yourself.

If you do not create a bridging file,

1. Create a header file: HeaderFileForSwiftAndOC.h
2. Find the path: project target, Bulid Settings, objective-c bridging Header
3. Fill in:$ (swift_module_name)/headerfileforswiftandoc.h

Fill in the code in the swift file with the OC file OC

OCClass.h

#import <Foundation/Foundation.h>@interface OCClass : NSObject- (void)ocFunction:(NSString *)str;@end

Occlass.m

#import "OCClass.h"#import "SwiftAndOC-Swift.h"//新建swift项目时默认创建，包含了所有swift文件引用@implementation OCClass- (void)ocFunction:(NSString *)str{    NSLog(@"\noc func par - str = %@",str);    SwiftObj *swiftObj = [[SwiftObj alloc]init];    [swiftObj swiftFuncWithPar:@"OC -> swift"];}@end

Swift

Viewcontroller.swift

import UIKitclass ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()                let ocObj = OCClass();        ocObj.ocFunction("swift -> OC");        // Do any additional setup after loading the view, typically from a nib.    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

Swiftobj.swift

import UIKitclass SwiftObj: NSObject {    @objc func swiftFunc(par:String){//@objc 很重要 必须写 不然oc调用时找不到该方法        print("swift func par = \(par)");    }}

Run the project

Controller printing

2018-06-20 18:01:19.346937+0800 SwiftAndOC[6803:243390] oc func par  = swift -> OCswift func par = OC -> swift

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Links: Technical Blog??????? Jane Book homepage

Mutual invocation of Swift and OC