Question

我正在进行JSON解析，我想在UITableView中显示解析后的数据。

为此，我尝试将解析后的数据从NSMutableDictionary分配到NSArray以显示在表视图中，但数组返回null。

这里我的数组返回null值;

NSMutableDictionary *tempDict1;
NSArray *arr = [[tempDict1 valueForKey:@"rates"]  componentsSeparatedByString:@";"];

码

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{
    [connection release];

    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    self.responseData = nil;

    //    NSArray *latestrates = [[responseString JSONValue] objectForKey:@"rates"];
    [responseString release];

    values = [responseString JSONValue];
    array = [[NSMutableArray alloc] init];
    array = [values valueForKey:@"rates"];
    NSLog(@"array values:--> %@",array);


    tempDict1 = (NSMutableDictionary *)array;  
    arr = [[tempDict1 valueForKey:@"rates"]  componentsSeparatedByString:@";"];
    NSString *subStar = @"=";
    NSMutableArray *arrTitle = [[NSMutableArray alloc] init];
    NSMutableArray *arrValues = [[NSMutableArray alloc] init];
    [arrTitle removeAllObjects];
    [arrValues removeAllObjects];
    for (int i=0; i<[arr count]-1; i++)
    {
        [arrTitle addObject:[[arr objectAtIndex:i] substringToIndex:NSMaxRange([[arr objectAtIndex:i] rangeOfString:subStar])-1]];
        [arrValues addObject:[[arr objectAtIndex:i] substringFromIndex:NSMaxRange([[arr objectAtIndex:i] rangeOfString:subStar])]];
        NSLog(@"arrTitle is:--> %@",arrTitle);
    }

    tempDict1 = (NSMutableDictionary*)[array objectAtIndex:0];
    array = [values valueForKey:@"rates"];
    NSLog(@"tempDict--%@",tempDict1);

    [arr retain];
    [tbl_withData reloadData];

}

Answer 1

尝试在connectionDidFinishLoading中编辑第四行

values = [responseString JSONFragments];

Answer 2

NSError *error = nil;
NSArray *array = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&error];
NSLog(@"Your data - %@",array);

现在您可以根据数据格式获取它。

修改

我想你也不知道如何获得webResponse 所以这是一种获得webResponse的方法 - 首先在XML课程中设置ViewController.h代理人并宣布NSMutableData全球

@interface ViewController : UIViewController<NSXMLParserDelegate> @property(nonatomic, retain)NSMutableData *responseData; @end

现在在responseData类
中合成了此ViewController.m
@synthesize responseData = _responseData;

现在，您可以使用request方法在服务器上发送viewDidLoad:，以您想要发送的方式发送给您。

-(void)viewDidLoad { NSString *urlString = [NSString stringWithFormat:@"http://EnterYourURLHere"]; NSURL *URL = [NSURL URLWithString:urlString]; NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc]init]; [urlRequest setURL:URL]; [urlRequest setHTTPMethod:@"POST"]; [urlRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-type"]; NSURLConnection *urlConnection = [[NSURLConnection alloc]initWithRequest:urlRequest delegate:self]; if(!urlConnection) { [[[UIAlertView alloc]initWithTitle:@"OOoopppssS !!" message:@"There is an error occured. Please check your internet connection or try again." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show]; } } #pragma mark - Parsing delegate methods -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { self.responseData = [[NSMutableData alloc]init]; [self.responseData setLength:0]; } -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.responseData appendData:data]; } -(void)connectionDidFinishLoading:(NSURLConnection *)connection { //Now parse your data here - NSError *error = nil; NSArray *array = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableContainers error:&error]; NSLog(@"Your data - %@",array); }

如何将值从NSMutableDictionary分配给NSArray

2 个答案: