Objective-C如何将nsdata从Web服务转换为nsarray

如何将ID转换为数组？

我有一个与服务器对话的苹果应用程序。

我遇到的问题是应用程序以id的形式返回数据，但是我需要将其转换为数组，因为实际返回的数据如下所示。

[["30","2",1],["15","67",1],["30","4",1]]

它实际上是mysql服务器的输出

实际的应用程序代码如下所示

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"blah blah"]];

    NSURL_Layer * connection = [[NSURL_Layer alloc]initWithRequest:request];
    [connection setCompletitionBlock:^(id obj, NSError *err) {

        if (!err) {
            //Need to convert the id to nsarray here, dunno how
        } else {
            //There was an error
        }

    }];
    [connection start];

NSURL.h

-(id)initWithRequest:(NSURLRequest *)req;

@property (nonatomic,copy)NSURLConnection * internalConnection;
@property (nonatomic,copy)NSURLRequest *request;
@property (nonatomic,copy)void (^completitionBlock) (id obj, NSError * err);


-(void)start;

NSURL.m

-(id)initWithRequest:(NSURLRequest *)req {
    self = [super init];
    if (self) {
        [self setRequest:req];
    }
    return self;
}

-(void)start {

    container = [[NSMutableData alloc]init];

    internalConnection = [[NSURLConnection alloc]initWithRequest:[self request] delegate:self startImmediately:YES];

    if(!sharedConnectionList)
        sharedConnectionList = [[NSMutableArray alloc] init];
    [sharedConnectionList addObject:self];

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    [container appendData:data];

}

//If finish, return the data and the error nil
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {

    if([self completitionBlock])
        [self completitionBlock](container,nil);

    [sharedConnectionList removeObject:self];

}

//If fail, return nil and an error
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    if([self completitionBlock])
        [self completitionBlock](nil,error);

    [sharedConnectionList removeObject:self];

}

更新：

我已经添加了

    NSURL_Layer * connection = [[NSURL_Layer alloc]initWithRequest:request];
    [connection setCompletitionBlock:^(id obj, NSError *err) {

        if (!err) {     
           NSError* error;          
           NSArray* array = [NSJSONSerialization JSONObjectWithData:obj options:NSJSONReadingAllowFragments error:&error];
        } else {
            //There was an error
        }

    }];
    [connection start];

但返回错误

error   NSError *   domain: @"NSCocoaErrorDomain" - code: 3840

_userInfo NSDictionary * 1个键/值对[0]（空）@“ NSDebugDescription”：@“字符0周围的值无效。”

更新：我把

NSLog(@"Data as string:%@", [[NSString alloc]initWithData:obj encoding:NSUTF8StringEncoding]);

这给了我一个奇怪的反馈。结果，我在下面查看了我的url请求的完整代码。

    NSString *post = [NSString stringWithFormat:@"unique_id=%@&unique_password=%@",ServerUniqueID,ServerPassword];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[post length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"blah blah"]];

    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];

    NSURL_Layer * connection = [[NSURL_Layer alloc]initWithRequest:request];
    [connection setCompletitionBlock:^(id obj, NSError *err) {

        if (!err)
        {
            NSError* error;
            NSArray* array = [NSJSONSerialization JSONObjectWithData:[NSData dataWithData: obj] options:NSJSONReadingAllowFragments error:&error];
            NSLog(@"Data as string:%@", [[NSString alloc]initWithData:obj encoding:NSUTF8StringEncoding]);

            int temp = array.count;

        }
        else
        {
            //There was an error
        }
    }];
    [connection start];

如果我删除

    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];

有用

如果它不这样做，那么我有一个全新的问题要研究。