NSDictionary *dictionary=[NSDictionary dictionaryWithObject:@"aa" forKey:@"1" ];
NSLog(@"%@",dictionary);
NSDictionary *dictionary1=[NSDictionary dictionaryWithObjectsAndKeys:@"aaa",@"1", nil];
NSLog(@"%@",dictionary1);
NSDictionary *dictionary3 = @{@"1":@"a",@"2":@"aa",@"3":@"aaa"};
NSLog(@"%@",dictionary3);
NSDictionary *dictionary2=[NSDictionary dictionaryWithDictionary:dictionary];
//字典的方法：
//字典键值对的个数
NSLog(@"%zi",dictionary3.count);
//获取某一关键字的值
NSString *str = [dictionary3 objectForKey:@"2"];
NSLog(@"%@",str);
//取出所有关键对应的值
//先取出字典中所有的键，放入一个数组中，然后对这个数组便利
NSArray *arr = [dictionary3 allKeys];//取出所有的键值
for (NSString *obj in arr){
NSLog(@"%@",dictionary3[obj]);//根据键取值
}
//使用枚举器取出值
NSString *obj1;
NSEnumerator *e = [dictionary3 objectEnumerator];//获取所有value的值
while (obj1=[e nextObject]) {
NSLog(@"@@@%@",obj1);
}
//stop代表遍历停止
[dictionary3 enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
if (stop) {
NSLog(@"key=%@,value=%@",key,obj);
}
}];