iOS开发--字典(NSDictionary)和JSON字符串(

1. 字典转Json字符串

// 字典转json字符串方法

-(NSString *)convertToJsonData:(NSDictionary *)dict

{

NSError *error;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];

NSString *jsonString;

if (!jsonData) {

    NSLog(@"%@",error);

}else{

    jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];

}

NSMutableString *mutStr = [NSMutableString stringWithString:jsonString];

NSRange range = {0,jsonString.length};

//去掉字符串中的空格

[mutStr replaceOccurrencesOfString:@" " withString:@"" options:NSLiteralSearch range:range];

NSRange range2 = {0,mutStr.length};

//去掉字符串中的换行符

[mutStr replaceOccurrencesOfString:@"\n" withString:@"" options:NSLiteralSearch range:range2];

return mutStr;

}

2. JSON字符串转化为字典

• (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString
  {
  if (jsonString == nil) {
  return nil;
  }

  NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
  NSError *err;
  NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
  options:NSJSONReadingMutableContainers
  error:&err];
  if(err)
  {
  NSLog(@"json解析失败：%@",err);
  return nil;
  }
  return dic;
  }