ios - 如何显示来自SKScene的UIViewController？

我正在通过Sprite Kit进入iOS，我认为这是不明智的。

我的目标是在游戏结束时显示一个“共享”按钮。轻按共享按钮应显示一个SLComposeViewController(Twitter共享)。场景的内容不应更改。

指示“游戏结束”的游戏逻辑存在于SKScene的子类SpriteMyScene.m中。

我可以通过以下方式在“游戏结束”上显示“共享”按钮:

-(void)update:(CFTimeInterval)currentTime {

if (gameOver){
  UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
                [button addTarget:self
                           action:@selector(sendToController)
                forControlEvents:UIControlEventTouchDown];
                [button setTitle:@"Show View" forState:UIControlStateNormal];
                button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
                [self.view addSubview:button];
    }
}

- (void)sendToController
{
    NSLog(@"ok");
    SpriteViewController *viewController = [SpriteViewController alloc];
    [viewController openTweetSheet];
}

我遇到问题的地方是试图使showTweetButton方法起作用。我的SpriteViewController.m看起来像这样:

- (void)openTweetSheet
    {
     SLComposeViewController *tweetSheet = [SLComposeViewController
                                           composeViewControllerForServiceType:
                                           SLServiceTypeTwitter];

    // Sets the completion handler.  Note that we don't know which thread the
    // block will be called on, so we need to ensure that any required UI
    // updates occur on the main queue
    tweetSheet.completionHandler = ^(SLComposeViewControllerResult result) {
        switch(result) {
                //  This means the user cancelled without sending the Tweet
            case SLComposeViewControllerResultCancelled:
                break;
                //  This means the user hit 'Send'
            case SLComposeViewControllerResultDone:
                break;
        }
    };

    //  Set the initial body of the Tweet
    [tweetSheet setInitialText:@"just setting up my twttr"];

    //  Adds an image to the Tweet.  For demo purposes, assume we have an
    //  image named 'larry.png' that we wish to attach
    if (![tweetSheet addImage:[UIImage imageNamed:@"larry.png"]]) {
        NSLog(@"Unable to add the image!");
    }

    //  Add an URL to the Tweet.  You can add multiple URLs.
    if (![tweetSheet addURL:[NSURL URLWithString:@"http://twitter.com/"]]){
        NSLog(@"Unable to add the URL!");
    }

    //  Presents the Tweet Sheet to the user
    [self presentViewController:tweetSheet animated:NO completion:^{
        NSLog(@"Tweet sheet has been presented.");
    }];
}

我总是在日志中得到这样的东西:

最佳答案

您正在创建一个新的 View Controller ，但从未展示它:

SpriteViewController *viewController = [SpriteViewController alloc];

我假设SpriteViewController是呈现SpriteMyScene的内容，并且您想将控制权交给呈现的SpriteViewController。

您需要在SpriteViewController子类中保留对SpriteMyScene的引用，然后在调用openTweetSheet时访问该引用。

在SpriteMyScene.h中

@class SpriteViewController;

@interface SpriteMyScene : SKScene

@property (nonatomic, weak) SpriteViewController *spriteViewController;

@end

在SpriteViewController.m中

// somewhere you initialize your SpriteMyScene object, I'm going to call it myScene

myScene.spriteViewController = self;

在SpriteMyScene.m中

#import "SpriteViewController.h"

- (void)sendToController
{
    NSLog(@"ok");
    // use the already-created spriteViewController
    [_spriteViewController openTweetSheet];
}