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superview-如何列出一般逻辑的真值表?

(UIViewController *)viewController {for(UIView * next = [selfsuperview]; next; next = next.superview){UIResponder * nextResponder = [nextnextResponder]; if([nextResponderisKindOfClass:[UIViewControllerclass]]){return(UIViewController *)nextResponder ;}} turnnil;}

如何列出一般逻辑的真值表

-(void)viewDidLoad {[superviewDidLoad]; //创建一个按钮UIButton * btn = [[UIButtonalloc] init]; //监听[btnCoveraddTarget:selfaction:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];}-(void) btnCLick:(id)sender {//如何访问此按钮? [senderremoveFromSuperview];}

程序运行后,在欢迎界面之后,它将进入AppDelegate,因此我们可以在application:didFinishLaunchingWithOptions:中添加代码以完成所需的效果。您可以使用第三方SDWebImage在线获取图片,因此您需要首先导入第三方文件夹。因为显示广告的页面是在欢迎界面的基础上显示的,所以您可以直接使用LaunchScreen.xib中的视图添加UIImageView来显示图片,然后将其添加到窗口并显示在顶层。

显示广告图片后,再次删除视图并显示程序的主界面。代码如下:#import“ AppDelegate.h” #import“ UIImageView + WebCache.h” @interfaceAppDelegate()@ property(strong,nonatomic)UIView * lunchView; @ end @ implementationAppDelegate @ synthesizelunchView ;-( BOOL)应用程序:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[self.windowmakeKeyAndVisible]; lunchView = [[NSBundlemainBundle] loadNibNamed:@“ LaunchScreen” owner:niloption LunchView.frame = CGRectMake(0,0,self.window.screen.bounds.size.width,self.window.screen.bounds.size.height); [self.windowaddSubview:lunchView]; UIImageView * imageV = [[UIImageViewalloc] initWithFrame:CGRectMake(0,50,320,300)]; NSString * str = @“ http://www.jerehedu.com/images/temp/logo.gif”; [imageVsd_setImageWithURL:[NSURLURLWithString:str ] placeholderImage:[UIImageimageNamed:@“ default1.jpg”]]; [lunchViewaddSubview:imageV]; [self.windowbringSubviewToFront:lunchView]; [NSTimerscheduledTimerWithTimeInterval:3target:selfselector:@selector(removeLun)userInfo:nilrepeats:否]; returnYES;}-(无效)removeLun {[lunchViewremoveFromSuperview];}

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