處理從Flickr解析的NSDictionary內容

Question

我遇到了一個問題，正確訪問從Flickr數據（flickr.photosets.getPhotos調用）構建的NSDictionary。它不僅僅顯示描述標籤的內容，而是讀取描述標籤......以及一些不必要的數據和引號。

例如：

NSLog (@"Item description readout: %@", itemDescriptionPre); 

產生這樣的響應：

Item description readout: { 
    "_content" = "This is a caption from a photo drawn through Flickr"; 
} 

我試圖修改的NSString這個

NSString *descripTruncated = [itemDescriptionPre substringFromIndex:17]; 

但它並沒有導致系統崩潰在運行時。它也不涉及項目結尾的項目。我很抱歉，因爲NSString的修改似乎在這裏被討論了很多，但我無法找到反映我的情況。

下面是一些更多的上下文我的代碼：

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 

NSLog(@"Storing incoming data"); 

NSDictionary *results = [jsonString JSONValue]; 

NSLog(@"Building NSDictionary."); 

NSArray *photos = [[results objectForKey:@"photoset"] objectForKey:@"photo"]; 

NSLog(@"Building array from dictionary."); 

// Loop through each entry in the dictionary... 
for (NSDictionary *photo in photos) 
{ 
NSString *title = [photo objectForKey:@"title"]; 

    NSString *description = [photo objectForKey:@"description"]; 

[photoTitles addObject:title]; 

    [photoDescriptions addObject:description]; 

} 

NSLog(@"Nicer display for results: %@ First image title: %@ First image description: %@", results, [photoTitles objectAtIndex:0], [photoDescriptions objectAtIndex:0]); 

[self updateDisplay]; 

} 


-(void) updateDisplay{ 

NSString *capTitle = [[photoTitles objectAtIndex:0] uppercaseString]; 

photoTitleDisplay.text = capTitle; 

NSString *itemDescriptionPre = [photoDescriptions objectAtIndex:0]; 

NSLog (@"Item description readout: %@", itemDescriptionPre); 

} 

Answer 1

itemDescriptionPre實際上是一個NSDictionary。這應該工作：

NSDictionary *itemDescriptionPre = [photoDescriptions objectAtIndex:0]; 
NSString *itemDescription = [itemDescriptionPre objectForKey:@"_content"];