字典(基本)

//字典的两种方法
//1.
NSDictionary *dic=[[NSDictionary alloc]initWithObjectsAndKeys:@”123”,@”456”,@”789”,@”666”,@”e”,@”w”, nil];
NSLog(@”%@”,dic);
//2.//注意这里和数组不同，是用的大括号
NSDictionary *dic1 = @{@”name”:@”set”,@”ty”:@”we”} ; NSLog(@”%@”,dic1);
//一个字典给另一个字典
NSDictionary *dic2 = [[NSDictionary alloc] initWithDictionary:dic];
NSLog(@”%@”,dic2);
//取值
NSString *str=[dic2 objectForKey:@”666”];
NSLog(@”%@”,str);
NSMutableDictionary *dic3=[dic1 mutableCopy];
[dic3 setValue:@”qqq” forKey:@”ooo”];
NSLog(@”%@”,dic3);