Swift 类和变量未分配并且从 Objective-C 可见

Question

我尝试使用 Swift 版本 4.2 和 5.0，结果相同。 Xcode 说当 Swift 对象从 Objective-C 代码初始化和使用时出错。库 SwiftR 是最新的。使用 Xcode 11.5

@import SwiftR;

@interface CHSignalrService ()

@property (strong, nonatomic) SignalR *srConnection;
@property (strong, nonatomic) Hub * chatHub;
@property (strong, nonatomic) Hub * orderHub;
@property (strong, nonatomic) Hub * onlineInterpreterHub;

@end

@implementation CHSignalrService

#pragma makr - Lifecycle

- (void)startConnectionWithAccessToken:(NSString *)at {
    if (self.srConnection != nil) {
        return;
    }
//below is error: No visible @interface for 'SignalR' declares the selector 'init:connectionType:'
    self.srConnection = [[SignalR alloc] init:kSignalRBaseURLString connectionType:ConnectionTypeHub];
    NSMutableDictionary *headersDict = [[NSMutableDictionary alloc] initWithDictionary:@{@"Authorization":at, @"Content-Type":@"application/json"}];
//below is error: Property 'headers' not found on object of type 'SignalR *'
    self.srConnection.headers = headersDict;
//below is error: No visible @interface for 'Hub' declares the selector 'init:'
    self.onlineInterpreterHub = [[Hub alloc] init:@"OnlineInterpreterHub"];
    [self.onlineInterpreterHub on:@"interpreterConnected" callback:^(NSArray * array) {
        [[NSNotificationCenter defaultCenter] postNotificationName:kOnlineInterpreterNotification object:array];
    }];
    self.chatHub = [[Hub alloc] init:@"ChatHub"];
    __weak typeof(self)weakSelf = self;
    [self.chatHub on:@"NobodyAnswered" callback:^(NSArray * array) {
        [weakSelf NobodyAnswered:nil];
    }];
}

Answer 1

在SignalR class声明之前添加@objc声明。供参考 - https://pinkstone.co.uk/how-to-use-swift-classes-in-objective-c/

像这样：

@objc
open class SignalR: NSObject, SwiftRWebDelegate {
    static var connections = [SignalR]()

希望这对你有用。

之前没有 @objc 声明：

谢谢:)

Swift 类和变量未分配并且从 Objective-C 可见

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Swift 类 和变量未分配并且从 Objective-C 可见

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Swift 类和变量未分配并且从 Objective-C 可见