如何从SKScene呈现UIViewController？ [英] How do I present a UIViewController from SKScene?

问题描述

我通过Sprite Kit进入iOS，我认为这是不明智的。

I'm entering iOS via Sprite Kit, which I recognize is unwise.

我的目标是在游戏结束时显示分享按钮。点击共享按钮应该呈现SLComposeViewController（Twitter共享）。场景的内容不应该改变。

My goal is to display a "Share" button upon Game Over. Tapping the share button should present a SLComposeViewController (Twitter Share). The contents of the scene should not change.

决定游戏结束的游戏逻辑存在于SpriteMyScene.m中，这是SKScene的子类。

The game logic that dictates "Game Over" lives in SpriteMyScene.m, a subclass of SKScene.

我可以通过这种方式在Game上显示一个Share按钮：

I'm able to display a Share button on Game Over this way:

-(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];
}

我遇到的问题是试图让showTweetButton方法起作用。我的SpriteViewController.m如下所示：

Where I get stuck is trying to get the showTweetButton method to work. My SpriteViewController.m looks like this:

- (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：

I always get something like this in the logs:

- [UIView presentScene：]：无法识别的选择器发送到实例0x13e63d00 2013-10-17 18：40：01.611修复[33409：a0b] * 由于未捕获的异常'NSInvalidArgumentException'而终止app
，原因：
' - [UIView presentScene：]：无法识别的选择器发送到实例
0x13e63d00'

-[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'

推荐答案

您正在创建一个新的视图控制器，但从不提供它：

You're creating a new view controller but never presenting it:

SpriteViewController *viewController = [SpriteViewController alloc];

我假设 SpriteViewController 是什么出现你的 SpriteMyScene ，你想把控制权交还给现在的 SpriteViewController 。

I'm assuming that SpriteViewController is what presents your SpriteMyScene, and you'd like to hand control back to the presenting SpriteViewController.

您需要在 SpriteMyScene 子类中保留对 SpriteViewController 的引用，然后在SpriteMyScene.h中调用 openTweetSheet 。

You need to keep a reference to SpriteViewController in your SpriteMyScene subclass, and then access that reference when you call openTweetSheet.

时访问该引用

@class SpriteViewController;

@interface SpriteMyScene : SKScene

@property (nonatomic, weak) SpriteViewController *spriteViewController;

@end

SpriteViewController.m中的

in SpriteViewController.m

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

myScene.spriteViewController = self;

SpriteMyScene.m中的

in SpriteMyScene.m

#import "SpriteViewController.h"

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

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