IOS开发Swift?与?OC相互调用详解

#import "MyViewController.h"
@interface MyViewController ()
@end
@implementation MyViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"OC";
    self.view.backgroundColor = UIColor.cyanColor;
    UILabel *lbl = [UILabel new];
    lbl.text = @"OC的标签";
    lbl.backgroundColor = UIColor.redColor;
    lbl.frame = CGRectMake(100, 100, 150, 50);
    [self.view addSubview:lbl];
}

#import "MyViewController.h"

import UIKit
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        title = "Swift"
        view.backgroundColor = .white
        let btn = UIButton(type: .custom)
        btn.frame = CGRect(x: 150, y: 150, width: 150, height: 100)
        btn.setTitle("点击跳转", for: .normal)
        btn.backgroundColor = .green
        view.addSubview(btn)
        btn.addTarget(self, action: #selector(didClickBtn), for: UIControl.Event.touchUpInside)
    }
    @objc func didClickBtn() {
        let myVC = MyViewController()
        navigationController?.pushViewController(myVC, animated: true)
    }
}

// OC的MyViewController.h文件
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface MyViewController : UIViewController
// 将method1方法在Swift中替换成swiftMethod()方法
- (void)method1 NS_SWIFT_NAME(swiftMethd());
// 将method2方法再Swift中隐藏
- (void)method2 NS_SWIFT_UNAVAILABLE("Swift中该方法不可调用");
@end
NS_ASSUME_NONNULL_END

class ViewController: UIViewController {
    override func viewDidLoad() {
        ......
    }
    @objc func didClickBtn() {
        let myVC = MyViewController()
        // 在Swift中找不到OC的method1与method2方法,只有一个改了名的swiftMethod方法
        myVC.swiftMethod()
        navigationController?.pushViewController(myVC, animated: true)
    }
}

// Objective-C API
- (instancetype)initWithClassName:(NSString *)name NS_REFINED_FOR_SWIFT;
// In Swift
init(__className: String)

// Objective-C API
- (NSString *)displayNameForMode:(DisplayMode)mode NS_REFINED_FOR_SWIFT;
// In Swift
func __displayNameForMode(mode: DisplayMode) -> String

// Objective-C API
@property DisplayMode mode NS_REFINED_FOR_SWIFT;
// In Swift
var __mode: DisplayMode { get set }

import Foundation
// 必须继承于 NSObject
class Person: NSObject {
    // 想公开给OC的要使用 @objc 修饰
    @objc var name: String
    @objc var age : Int
    @objc init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

#import "MyViewController.h"
#import "SwiftAndOC-Swift.h"
@interface MyViewController ()
@end
@implementation MyViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    Person *p = [[Person alloc] initWithName:@"LZ" age:18];
    NSLog(@"%@",p.name);
}