如何使用objective-c向接口公开自定义初始化实现？

Posted 2023-03-10

【中文标题】如何使用objective-c向接口公开自定义初始化实现？

【英文标题】：How do I expose custom init implememntation to interface using objective-c?

【发布时间】：2020-02-25 07:46:46

【问题描述】：

我简单地定义了这样的 Swift 协议：

@objc protocol MobileKeyable 
   var assaAbloyLockServiceCode: Int  get 

然后我在我的objective-c类中使用它：

- (id)initWithComposition: (id<MobileKeyable>)composition 
    self = [super init];
    if (self) 
        _lockServiceCodes = @[@([composition assaAbloyLockServiceCode])];
    
    return self;

然后我想像这样在 Swift 中初始化该控制器：

let composition = //here MobileKeyable
MobileKeysController(composition: composition)

所以我需要将该初始化程序暴露给 Objective-c 接口：

#import "MyProject-Swift.h"
@interface MobileKeysController : NSObject <MobileKeysManagerDelegate>
- (instancetype) initWithComposition: (id<MobileKeyable>)composition;
@end

但在这里我有一个错误：MyProject-Swift.h file not found。为什么？

【参考方案1】：

也许 Xcode 试图避免一些循环......只是假设。试试转发声明

@protocol MobileKeyable;

@interface MobileKeysController : NSObject <MobileKeysManagerDelegate>
- (instancetype) initWithComposition: (id<MobileKeyable>)composition;
@end