objective-c - 从另一个类添加和控制UIImageView subview

我有两个类：MainViewController和PlayerImageController（NSObject）

我如何能够将UIImageView的子视图从PlayerImageController添加到MainViewController并规定诸如

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.view addSubview:[PlayerImageController addPlayerImage]];
}

- (void)somethingHappened
{
    [PlayerImageController changePlayerImage];
}

并将我的方法放在PlayerImageController类中，例如

+ (UIImageView *) addPlayerImage
{
    heroPlayerImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"hero-still.png"]];
    [heroPlayerImageView setFrame:CGRectMake(151, 200, 17, 23)];
    return heroPlayerImageView;
}

+ (void) changePlayerImage
{
  //change image
}

谢谢！

最佳答案

我认为在您的情况下，您应该使用代理模式。
宣布：

@protocol PlayerImageUpdater
  - createPlayerImage;
  - changePlayerImage;
@end

然后加：

@interface PlayerImageController <PlayerImageUpdater>

然后添加到MainViewController ivar和属性，如：

@property (...) id<PlayerImageUpdater> playerDelegate;

将此代表设置为：mainViewController.playerDelegate = playerImageControllerInstance;

并在代码中使用：

[playerDelegate createPlayerImage];
[playerDelegate changePlayerImage];