从可变字典中删除条目

- removeObjectForKey：

从字典中删除给定的键及其关联值。

NSMutableDictionary *dict =  [NSMutableDictionary dictionaryWithDictionary:@{@"key1":@"Easy",@"key2": @"Tutorials"}];
[dict removeObjectForKey:@"key1"];
NSLog(@"%@",dict);

OUTPUT

{
    key2 = Tutorials;
} 

- removeAllObjects

清空其条目的字典。

NSMutableDictionary *dict =  [NSMutableDictionary dictionaryWithDictionary:@{@"key1":@"Eezy",@"key2": @"Tutorials"}];
[dict removeAllObjects];
NSLog(@"%@",dict);

OUTPUT

{
}

- removeObjectsForKeys：

从给定数组中的元素指定的字典条目中删除。

NSMutableDictionary *dict =  [NSMutableDictionary dictionaryWithDictionary:@{@"key1":@"Easy",@"key2": @"Tutorials"}];
[dict removeObjectsForKeys:@[@"key1"]];
NSLog(@"%@",dict);

OUTPUT

{
    key2 = Tutorials;
}