ios - 如何从 SKScene 呈现 UIViewController？

Question

我通过 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“分享”按钮。点击共享按钮应该会显示一个 SLComposeViewController(Twitter 共享)。场景的内容不应该改变。

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

我可以通过这种方式在游戏结束时显示分享按钮:

-(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];
}

我遇到困难的地方是试图让 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信息:

-[UIView presentScene:]: unrecognized selector sent to instance 0x13e63d00 2013-10-17 18:40:01.611 Fix[33409:a0b] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView presentScene:]: unrecognized selector sent to instance 0x13e63d00'

Answer 1

您正在创建一个新的 View Controller 但从未呈现它:

SpriteViewController *viewController = [SpriteViewController alloc];

我假设 SpriteViewController 是呈现您的 SpriteMyScene 的，您希望将控制权交还给呈现 SpriteViewController。

您需要在 SpriteMyScene 子类中保留对 SpriteViewController 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];
}