無法從JSON蒸汽檢索對象來枚舉

我試圖掌握如何在目標C中使用塊。在這個簡單的應用程序，我正在寫，我得到一組圖像作爲一個JSON流。我試圖讓圖像出來並將它們物化，然後將它們收集到NSMutableArray中。下面是我的代碼無法從JSON蒸汽檢索對象來枚舉

WebImage.h

#import <Foundation/Foundation.h> 

@interface WebImage : NSObject <NSCopying> 

@property (strong, nonatomic) NSString *imageId; 
@property (strong, nonatomic) NSString *imageName; 
@property (strong, nonatomic) NSString *imagePath; 

- (id)initWithId:(NSString *)imageId andName:(NSString *)imageName andPath:(NSString *)imagePath; 
+ (NSArray *)retrieveAllImages; 

@end

WebImage.m

#import "WebImage.h" 
#import "AFNetworking.h" 

#define HOST_URL @"http://toonmoodz.osmium.lk/" 

@implementation WebImage 

#pragma mark - NSCopying 
- (id)copyWithZone:(NSZone *)zone 
{ 
    WebImage *newImage = [WebImage new]; 
    newImage.imageId = self.imageId; 
    newImage.imageName = self.imageName; 
    newImage.imagePath = self.imagePath; 

    return newImage; 
} 

- (id)initWithId:(NSString *)imageId andName:(NSString *)imageName andPath:(NSString *)imagePath 
{ 
    if (self = [self init]) { 
     self.imageId = imageId; 
     self.imageName = imageName; 
     self.imagePath = imagePath; 
    } 
    return self; 
} 

+ (NSArray *)retrieveAllImages 
{ 
    NSMutableArray *images = [[NSMutableArray alloc] init]; 

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 
    [manager GET:[NSString stringWithFormat:@"%@%@", HOST_URL, @"All_Images.php"] parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) { 

     NSDictionary *dict = responseObject[@"Images"]; 
     NSArray *arr = [dict allValues]; 
     [arr enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { 
      NSDictionary *image = obj; 
      NSLog(@"%@", image); 
      [images addObject:[[WebImage alloc] initWithId:[image objectForKey:@"id"] 
                 andName:[image objectForKey:@"name"] 
                 andPath:[image objectForKey:@"image"]]]; 
     }]; 

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     NSLog(@"Error in image retrieveing: %@", error.localizedDescription); 
    }]; 

    return [images copy]; 
}

傳入的JSON流看起來像這樣

{ 
    Images = (
     { 
      createddate = "2014-01-08 12:20:24"; 
      id = 1; 
      image = "images/Rock_1.png"; 
      isEnabled = 1; 
      name = "Rock_1"; 
     }, 
     { 
      createddate = "2014-01-08 15:12:26"; 
      id = 2; 
      image = "images/Rock_2.png"; 
      isEnabled = 1; 
      name = "Rock_2"; 
     } 
    ); 
}

我的問題是我無法檢索來自JSON字符串的圖像對象。當我調試時，編譯器甚至不會進入retrieveAllImages方法中的GET塊，而是直接跳轉到return語句。

任何人都可以請告訴我如何糾正？

我創建了一個項目，演示了我正面臨的問題，並且我已經上傳了它here如果您想快速瀏覽一下。

謝謝。

來源

2014-01-14 Isuru

您是否嘗試在'GET'塊中設置斷點**？我認爲如果你從外部接近它們，調試器會跳過塊。 – hgwhittle

我只是試過，但沒有。它仍然跳過該塊。 – Isuru

它也沒有進入故障模塊？ – hgwhittle

問題是與

NSDictionary * dict = responseObject [@「Images」]; NSArray * arr = [dict allValues];

responseObject [@「Images」];返回一個NSArray類。所以改變你的字典到NSArray類。並用那個'dict'對象進行枚舉。你不需要你arr對象。

來源

2014-01-23 07:00:53

無法從JSON蒸汽檢索對象來枚舉

回答

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