ios中将单个字典转换成json格式以及json格式的转换成字典解析

 //1.这段代码是将字典封装数据。

NSMutableDictionary *dict  = [[NSMutableDictionary alloc]init];
[dict setValue:@"谢飞" forKey:@"name"];
[dict setValue:@"1070430532@qq.com" forKey:@"email"];
[dict setValue:@"ios工程师" forKey:@"profession"];

//2.字典序列化，变成json字符串
NSData *dictData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];
NSString *jsonString = [[NSString alloc]initWithData:dictData encoding:NSUTF8StringEncoding];
 

//3.将json字符串再次转换成单个字典字段。
NSData* xmlData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *perDict = [NSJSONSerialization JSONObjectWithData:xmlData options:(NSJSONReadingMutableLeaves) error:nil];
NSString *name2 = [perDict objectForKey:@"name"];
NSLog(@"姓名是：%@",name2);