使用 RCTAsyncLocalStorage + getAllKeys

我正在尝试获取 iOS 本机代码上的 AsyncStorage。这是我的代码

- (void)jsonFromLocalRNStrogeForKey:(NSString *)key completion:(void (^)(NSDictionary * _Nullable, NSError * _Nullable))completion {
    RCTResponseSenderBlock rnCompletion = ^(NSArray *response) {

        NSString *jsonAsString;

        if (response.count > 1) {
            NSArray *response1 = response[1];
            if (response1.count > 0) {
                NSArray *response2 = response1[0];
                if (response2.count > 1) {
                    jsonAsString = response2[1];
                }
            }
        }

        @try {
            NSData *jsonAsData = [jsonAsString dataUsingEncoding:NSUTF8StringEncoding];

            NSError *error;

            NSDictionary *json = [
              NSJSONSerialization
              JSONObjectWithData:jsonAsData
              options:NSJSONReadingMutableContainers
              error:&error
            ];

            completion(json, error);
        }
        @catch (NSException *exception) {
            NSLog(@"error: %@", exception.reason);

            NSMutableDictionary * info = [NSMutableDictionary dictionary];
            [info setValue:exception.name forKey:@"ExceptionName"];
            [info setValue:exception.reason forKey:@"ExceptionReason"];
            [info setValue:exception.callStackReturnAddresses forKey:@"ExceptionCallStackReturnAddresses"];
            [info setValue:exception.callStackSymbols forKey:@"ExceptionCallStackSymbols"];
            [info setValue:exception.userInfo forKey:@"ExceptionUserInfo"];

            NSError *error = [[NSError alloc] initWithDomain:@"" code:1 userInfo:info];

            completion(nil, error);
        }
    };

    // RCTAsyncLocalStorage *storage = [RCTAsyncLocalStorage new];
    RCTAsyncLocalStorage *storage = [[RCTAsyncLocalStorage alloc] init];

    dispatch_async(storage.methodQueue, ^{
        @try {
            // [storage performSelector:@selector(multiGet:callback:) withObject:@[key] withObject:rnCompletion];
            [storage performSelector:@selector(getAllKeys:callback:) withObject:rnCompletion];
        }
        @catch (NSException *exception) {
            NSLog(@"error: %@", exception.reason);
        }
    });
}

当我试图拿到我的一把钥匙时(multiGet)

[self jsonFromLocalRNStrogeForKey:@"session" completion:^(NSDictionary* data,NSError* error) {
    if (data) {
        NSString * name = [data valueForKeyPath: @"token"];
        if (![name isKindOfClass:[NSNull class]]) {
            [self reportIncomingCallFrom:name withUUID:callInvite.uuid];
        }
    } else {
        NSLog(@"error: JSON Parsing Error: %@",error.localizedFailureReason);
    }
}];

我总是归零

当我试图拿到所有钥匙时(...@selector(getAllKeys:...)看看我的 AsyncStorage 中有什么，我得到了异常

@"NSInvalidArgumentException" - reason: @"-[RCTAsyncLocalStorage getAllKeys:callback:]: unrecognized selector sent to instance 0x1085512c0"

注册护士有RCT_EXPORT_METHOD(getAllKeys:(RCTResponseSenderBlock)callback) in RCTAsyncLocalStorage.m;但在RCTAsyncLocalStorage.h (void)getAllKeys:(RCTResponseSenderBlock)callback它不存在，甚至添加它也不起作用（https://github.com/facebook/react-native/blob/master/React/Modules/RCTAsyncLocalStorage.h https://github.com/facebook/react-native/blob/master/React/Modules/RCTAsyncLocalStorage.h).

"react-native": "^0.48.4",

如何返回 NSJsonSerialization https://stackoverflow.com/questions/48232786/how-can-i-return-nsjsonserialization

首先，

注册护士有 RCT_EXPORT_METHOD(getAllKeys:(RCTResponseSenderBlock)回调) 在 RCTAsyncLocalStorage.m；但在 RCTAsyncLocalStorage.h (void)getAllKeys:(RCTResponseSenderBlock)回调它不存在

在 Objective-C 中，即使未在头文件中声明，您也可以调用方法performSelector:withObject:.

直接调用此方法（无需先检查目标是否respondsToSelector:) 是不好的做法，因为内部方法声明可能会改变。

其次，这一行是不正确的：

[storage performSelector:@selector(getAllKeys:callback:) withObject:rnCompletion];

在这里，你说的是getAllKeys::采用两个参数，但实现仅声明一个。

因此，提取所有密钥的正确方法如下：

dispatch_async(storage.methodQueue, ^{

    if([storage respondsToSelector:@selector(getAllKeys:)]){
        [storage performSelector:@selector(getAllKeys:) withObject:[^(NSArray* response){
            NSLog(@"Contents: %@",response);
        } copy]];
    }else{
        NSLog(@"storage does not respond to selector `getAllKeys:`");
    }

});