iOS对象（字典或数组）转化为JSon…

 NSMutableDictionary *dictionary
= [[NSMutableDictionary alloc] init];

   
[dictionary setValue:@"hello" forKey:@"one"];

   
[dictionary setValue:@"world" forKey:@"two"];

 
  NSArray *arry=[NSArray arrayWithObjects:@"001",@"002",@"003", nil];

   
[dictionary setValue:arry forKey:@"three"];

 
  NSData *data=[NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:nil];

 
  NSString *jsonStr=[[NSString alloc]initWithData:dataencoding:NSUTF8StringEncoding];

    NSLog(@"jsonStr==%@",jsonStr);

输出结果为：

 


str=={


  "one" : "hello",


  "two" : "world",


  "three" : [


    "001",


    "002",


    "003"


  ]


}