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The API is written very clearly. Use propertyListWithData:options:format:error: instead.
[NSPropertyListSerialization propertyListWithData:tempData options:NSPropertyListImmutable format:NULL error:NULL];

The system library cannot solve the problem?

Test code:

NSString *dataStr = @"求助~ Unicode 轉(zhuǎn) NSString";
    
NSString *utf8Str = [NSString replaceUnicode:dataStr];    
NSLog(@" utf8Str = %@",utf8Str);
    
NSString *unnicodeStr = [NSString utf8ToUnicode:utf8Str];    
NSLog(@" unicode = %@",unnicodeStr);

Run results:

Write these two methods into the NSString category

//Unicode轉(zhuǎn)UTF-8
+ (NSString*) replaceUnicode:(NSString*)aUnicodeString
{
    NSString *tempStr1 = [aUnicodeString stringByReplacingOccurrencesOfString:@"\u" withString:@"\U"];
    
    NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\""];
    
    NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];
    
    NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];
    
    NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData
                           
                                                           mutabilityOption:NSPropertyListImmutable
                           
                                                                     format:NULL
                           
                                                           errorDescription:NULL];
    
    return [returnStr stringByReplacingOccurrencesOfString:@"\r\n" withString:@"\n"];
    
}
// utf8轉(zhuǎn)unnicode
+(NSString *) utf8ToUnicode:(NSString *)string
{
    NSUInteger length = [string length];
    
    NSMutableString *str = [NSMutableString stringWithCapacity:0];
    
    for (int i = 0;i < length; i++) {
        
        unichar _char = [string characterAtIndex:i];
        //判斷是否為英文和數(shù)字
        if (_char <= '9' && _char >= '0') {
            
            [str appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];
        } else if(_char >= 'a' && _char <= 'z') {
            
            [str appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];
        } else if(_char >= 'A' && _char <= 'Z') {
            
            [str appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];
        } else {
            [str appendFormat:@"\u%x",[string characterAtIndex:i]];
        }
    }
    return str;
}