objective-c - swift 错误 : 'manager()' is unavailable: use object construction 'AFHTTPRequestOperationManager()'

Question

我有这个快速代码，我认为它应该可以工作，但它不能处理 objective-c 静态字段。我尝试在多个地方添加“()”，但没有任何效果。

func AFHTTPRequestOperationManagerDispatchOnMainQueue(mainQueue: Bool) -> AFHTTPRequestOperationManager {
    var manager = AFHTTPRequestOperationManager.manager
    manager.responseSerializer = AFJSONResponseSerializer(readingOptions: NSJSONReadingOptions.AllowFragments)
    manager.requestSerializer = AFJSONRequestSerializer(readingOptions: NSJSONReadingOptions.AllowFragments)
    if (!mainQueue) {
        manager.completionQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
    }
    return manager;
}

字段和属性如下所示:

+ (instancetype)manager;
@property (nonatomic, strong) AFHTTPRequestSerializer <AFURLRequestSerialization> * requestSerializer;
@property (nonatomic, strong) AFHTTPResponseSerializer <AFURLResponseSerialization> * responseSerializer;

我收到这些错误消息:

Error: 'manager()' is unavailable: use object construction 'AFHTTPRequestOperationManager()'
Error: '() -> AFHTTPRequestOperationManager!' does not have a member named 'responseSerializer'
Error: '() -> AFHTTPRequestOperationManager!' does not have a member named 'requestSerializer'
Error: '() -> AFHTTPRequestOperationManager!' does not have a member named 'completionQueue'
Error: function produces expected type 'AFHTTPRequestOperationManager!'; did you mean to call it with '()'?

Answer 1

当 Objective-C 导入 Swift 时，正如您在此处使用 AFNetworking 所做的那样，可识别的工厂方法将转换为简单的初始化程序。在这种情况下，这意味着(正如@Martin 指出的那样)您应该改用该表格:

var manager = AFHTTPRequestOperationManager()