我通过Sprite Kit进入iOS,我认识到这是不明智的.
我的目标是在Game Over上显示一个“Share”按钮.轻击共享按钮应该呈现一个SLComposeViewController(Twitter Share).场景的内容不应该改变.
规定“游戏结束”的游戏逻辑生活在SKScene的子类SpriteMyScene.m中.
我可以在游戏中显示一个Share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];
}
我遇到困难是试图让showTweetButton方法工作.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：
-[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’
解决方法
您正在创建一个新的视图控制器,但不会显示它：
SpriteViewController *viewController = [SpriteViewController alloc];
我假设SpriteViewController是呈现您的SpriteMyScene,并且您想手动控制回呈现的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
@class SpriteViewController; @interface SpriteMyScene : SKScene @property (nonatomic,weak) SpriteViewController *spriteViewController; @end
在SpriteViewController.m
// somewhere you initialize your SpriteMyScene object,I'm going to call it myScene myScene.spriteViewController = self;
在SpriteMyScene.m
#import "SpriteViewController.h"
- (void)sendToController
{
NSLog(@"ok");
// use the already-created spriteViewController
[_spriteViewController openTweetSheet];
}
