如何在Objective-C中将Xcode中的特定响应转换为JSON格式？

Got it, that string you're working with is actually in the old OpenStep-style ASCII property list format—it's what you get when you print an NSDictionary with description in Objective-C, not valid JSON. Luckily, you don't have to manually hack the string to fix it; Foundation has built-in tools to handle this cleanly.

The Recommended Approach: Use NSPropertyListSerialization #

This framework is designed to parse exactly this kind of plist string, then we can convert the resulting dictionary straight to JSON. Here's a step-by-step implementation:

// First, make sure your input string is complete (yours was missing a closing })
NSString *rawPlistString = @"{ \"abc\" = \"lmn\"; \"def\" = \"pqr\"; object = { \"object1\" = { obj = 1; obj2 = ABC; }; \"object2\" = { obj3 = 0; obj4 = LMN; }; }; }";

// Convert the string to NSData
NSData *plistData = [rawPlistString dataUsingEncoding:NSUTF8StringEncoding];

// Parse the plist data into an NSDictionary
NSError *parseError = nil;
NSDictionary *resultDict = [NSPropertyListSerialization propertyListWithData:plistData
                                                                     options:NSPropertyListImmutable
                                                                      format:nil
                                                                       error:&parseError];

if (!parseError && resultDict) {
    // Now convert the dictionary to valid JSON
    NSError *jsonError = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:resultDict
                                                       options:NSJSONWritingPrettyPrinted // Optional: makes JSON human-readable
                                                         error:&jsonError];
    
    if (!jsonError && jsonData) {
        NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        NSLog(@"Converted JSON:\n%@", jsonString);
        // Use jsonString however you need
    } else {
        NSLog(@"Failed to convert to JSON: %@", jsonError.localizedDescription);
    }
} else {
    NSLog(@"Failed to parse plist string: %@", parseError.localizedDescription);
}

Why This Works: #

• NSPropertyListSerialization natively understands the key = value; syntax of OpenStep plists, even handling unquoted keys/values (like obj = 1 or obj2 = ABC) correctly.
• Once you have an NSDictionary, converting to JSON is trivial with NSJSONSerialization—it handles all the quote placement, colon replacement, and structure formatting automatically.

Manual String Manipulation (Not Recommended) #

If for some reason you can't use the plist parser, you could do string replacements, but this is error-prone (especially with nested objects or edge cases):

• Replace all instances of = with :
• Replace all instances of ; with ,
• Add quotes around unquoted keys and string values (you'll need to distinguish numeric values from strings to avoid quoting numbers like 1 or 0)

This approach is fragile, so stick with the framework method unless you have no other choice.

内容的提问来源于stack exchange，提问作者HSBP