ios-NSInvalidArgumentException引發應用崩潰

NSInvalidArgumentException引發應用崩潰

看一下我的代碼，從網站服務器獲得數據，但是崩潰了：

- (void)loadDataSource  
 {

   // Request  
    NSString *URLPath = [NSString stringWithFormat:@"http://imgur.com/gallery.json"];  
    NSURL *URL = [NSURL URLWithString:URLPath];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];

**CRASHED HERE**    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)  
 {

        NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];

        if (!error && responseCode == 200) {
            id res = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
            if (res && [res isKindOfClass:[NSDictionary class]]) {
                self.items = [res objectForKey:@"gallery"];
                [self dataSourceDidLoad];
            } else {
                [self dataSourceDidError];
            }
        } else {
            [self dataSourceDidError];
        }
    }];
}    

最佳回答：

代碼沒問題，但是結果中沒有對象關鍵字“gallery”的，看起來關鍵字好像是“data”。所以用下面的代碼：

self.items = [res objectForKey:@"data"]