NSDictionary 常用方法
NSDictionary用于保存具有映射关系的数据，因此，NSDictionary集合里保存着两组值：
一组用于保存NSDictionary里的key
另一组用于保存NSDictionary里的value
其中key与value都可以是任何引用类型的数据，key与value之间存在单向一对一的关系。（key不允许重复）
1.创建字典对象；
NSDictionary * dicYaoGe = [NSDictionary dictionaryWithObjectsAndKeys:@"瑶哥", @"name",
@"?", @"sex",
@"18", @"age",
@"105", @"weight",
nil];
NSLog(@"%@",dicYaoGe);
注意：此处写法比较反人类，value在前，key在后。
运行结果：
2014-09-19 20:47:06.329 oc07_字典[6837:303] {
age = 18;
name = "\U7476\U54e5";
sex = "?";
weight = 105;
}
2.获取所有key值
NSLog(@"%@", [dicYaoGe allKeys]);
运行结果：
2014-09-19 20:47:06.473 oc07_字典[6837:303] (
age,
sex,
weight,
name
)
3.获取所有value值
NSLog(@"%@", [dicYaoGe allValues]);
运行结果：
2014-09-19 20:47:06.474 oc07_字典[6837:303] (
18,
"?",
105,
"\U7476\U54e5"
)
4.通过key值查询value
NSLog(@"%@",[dicYaoGe objectForKey:@"weight"]);
运行结果：
2014-09-19 20:47:06.474 oc07_字典[6837:303] 105
快速遍历方法：
for (NSString *key in dicYaoGe) {
NSLog(@"%@ - %@",key ,[dicYaoGe objectForKey:key]);
}
运行结果：
2014-09-19 20:47:06.475 oc07_字典[6837:303] age - 18
2014-09-19 20:47:06.476 oc07_字典[6837:303] sex - ?
2014-09-19 20:47:06.476 oc07_字典[6837:303] weight - 105
2014-09-19 20:47:06.477 oc07_字典[6837:303] name - 瑶哥
NSMutableDictionary 常用方法
NSMutableDictionary *dicZijie = [NSMutableDictionary dictionaryWithObjectsAndKeys:
@"王子杰",@"name",
@"难以判断",@"sex",
@"七老八十",@"age",
@"200",@"weight",nil];
for (NSString *key in dicZijie) {
NSLog(@"%@-%@",key , [dicZijie objectForKey:key]);
}运行结果：
2014-09-19 20:57:55.310 oc07_字典[6858:303] age--七老八十
2014-09-19 20:57:55.311 oc07_字典[6858:303] hoby--男
2014-09-19 20:57:55.311 oc07_字典[6858:303] weight--200
2014-09-19 20:57:55.312 oc07_字典[6858:303] name--王子杰
1.添加键值对。
[dicZijie setValue:@"LOL" forKey:@"hoby"];
2.修改key对应的value
[dicZijie setValue:@"男" forKey:@"hoby"];
3.删除键值对。
[dicZijie removeObjectForKey:@"sex"];
4.通过for循环遍历所有键值对
for (NSString *key in dicZijie) {
NSLog(@"%@-%@",key , [dicZijie objectForKey:key]);
}运行结果：
2014-09-19 21:00:49.198 oc07_字典[6872:303] age-七老八十
2014-09-19 21:00:49.199 oc07_字典[6872:303] hoby-男
2014-09-19 21:00:49.199 oc07_字典[6872:303] weight-200
2014-09-19 21:00:49.200 oc07_字典[6872:303] name-王子杰
对于一个数组中字典的遍历：
NSDictionary *dicDaGe = [NSDictionary dictionaryWithObjectsAndKeys:@"大哥", @"name",
@"卖药", @"hoby",
@"男", @"sex",nil];
NSMutableArray *tongJi = [NSMutableArray arrayWithObjects:dicZijie,dicYaoGe,dicDaGe, nil];
for (NSDictionary *dic in tongJi) {
NSLog(@"______________");
for (NSString *key in dic) {
NSLog(@"%@--%@",key,[dic objectForKey:key]);
}
}
运行结果：
2014-09-19 21:00:49.201 oc07_字典[6872:303] ______________
2014-09-19 21:00:49.201 oc07_字典[6872:303] age--七老八十
2014-09-19 21:00:49.201 oc07_字典[6872:303] hoby--男
2014-09-19 21:00:49.202 oc07_字典[6872:303] weight--200
2014-09-19 21:00:49.202 oc07_字典[6872:303] name--王子杰
2014-09-19 21:00:49.203 oc07_字典[6872:303] ______________
2014-09-19 21:00:49.203 oc07_字典[6872:303] age--18
2014-09-19 21:00:49.204 oc07_字典[6872:303] sex--?
2014-09-19 21:00:49.204 oc07_字典[6872:303] weight--105
2014-09-19 21:00:49.205 oc07_字典[6872:303] name--瑶哥
2014-09-19 21:00:49.205 oc07_字典[6872:303] ______________
2014-09-19 21:00:49.206 oc07_字典[6872:303] name--大哥
2014-09-19 21:00:49.206 oc07_