iOS基础知识：Objective-C 之 JSON&XML_objective-c dictionary to json string-优快云博客

本文链接：https://blog.youkuaiyun.com/weizhouhui2013/article/details/48299631

本文探讨了iOS开发中Objective-C对JSON和XML的处理。介绍了JSON的含义，从字典转JSON字符串的方法，以及如何将JSON转换回字典。同时，概述了XML的全称——扩展文本标记语言，讲解了使用XMLDictionary解析XML的过程，以及如何将字典转换为XML字符串。

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JSON&&XML

JSON

1、全称：JavaScript Object Notation
2、from dictionary to JSON string

//creat a dictionary
    NSDictionary *jsonDic = @{
                              @"name":@"weizh",
                              @"age":@24,
                              @"gender":@"male",
                              @"weight":@140
                              };
//creat jsonData with jsonSerialization
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDic options:NSJSONWritingPrettyPrinted error:nil];
//switch to string and print    
    NSString *jsonStr = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];

    NSLog(@"jsonStr:%@",jsonStr);

print information:

jsonStr:{
  "age" : 24,
  "gender" : "male",
  "weight" : 140,
  "name" : "weizh"
}

3、from JSON to dictionary

//get data from JSON file
    NSData *jsonData = [NSData dataWithContentsOfFile:@"/Users/customer/desktop/test.json"];
//switch JSON data to OC class    
    NSError *error;
    id obj = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];

    NSLog(@"obj:%@",obj);

XML
1、全称：EXtensible Markup Language 扩展文本标记语言
2、XMLDictionary parse the XML


    XMLDictionaryParser *parser = [XMLDictionaryParser sharedInstance];
//creat dicitonary by xml dictionary parser (dictionary categary added in XMLDictionary file)     
    NSDictionary *xmlDic = [parser dictionaryWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.baidu.com"]]];

    NSLog(@"xmlDic:%@",xmlDic);

3、switch dictionary to XML string

    NSDictionary *xmlDic = @{
                              @"__name":@"Person",
                              @"__attributes":@{@"id":@"123",@"class":@"hello"},
                              @"name":@"weizh",
                              @"age":@24,
                              @"gender":@"male",
                              @"height":@1.74
                              };
    NSString *xmlStr = [xmlDic XMLString];
    NSLog(@"xmlStr: %@",xmlStr);

print information:

xmlStr: 
<Person id="123" class="hello">
    <age>24</age>
    <gender>male</gender>
    <name>weizh</name>
    <height>1.74</height>
</Person>