NSDictionary * dic =

@{@"key":@"value",

@"key1":@"value1",

@"key2":@"value2",

@"key3":@"value3"};

NSLog(@"%@",dic);

//1.先取出字典中的keys,然后對使用數組的方式對key進行遍歷

NSArray * array = [dic allKeys];

for (NSString * key in array) {

//? ? ? ? ? ? NSString * value2 = [dic objectForKey:key];

NSString * value = dic[key];

NSLog(@"%@",value);

}

//2.快速遍歷字典

//key1不能代表鍵值對 代表的是key

for (NSString * key1 in dic) {

NSString * value2 = dic[key1];

NSLog(@"%@",value2);

}

//枚舉器

//keyEnumerator //枚舉的是key

//objectEnumerator //枚舉的是value

NSEnumerator * e = [dic keyEnumerator];

NSString * key;

//代表的是key

while ((key = [e nextObject])!=nil) {

NSString * value = dic[key];

NSLog(@"%@",value);

}