我看到我的iOS应用程序不允许从最近升级到iOS 11的应用程序商店下载,所以我正在尝试更新它。我在Xcode 9中使用它,现在我已经设法在我的iPhone 6上启动了应用程序。但是,在初始屏幕显示之后,我似乎无法显示它。
例如,初始显示成功显示并显示一个名为“start”的按钮。当你按下它时会弹出另一个显示,但它不会(虽然它到达显示它的代码)。
这是代码,在一个名为“StartController.m”的类中,它应该调用显示:
NSLog(@"nav controller = %@", self.navigationController);
// push question controller onto the stack
[self.navigationController pushViewController:questionController animated:YES];
// the nav controller owns it now, we can release it
[questionController release];
调试显示按下按钮时成功调用此代码,但在issueController发布后,没有任何反应。 这是StartController.h中questionController的声明:
@interface StartController : UIViewController <ADBannerViewDelegate>{
QuestionController *questionController;
这是StartController.m中相同的声明:
@implementation StartController
@synthesize questionController, settingsController, nextLevelViewController, appState;
使用此代码在app delegate的“didFinishLaunchingWithOptions”方法中成功显示初始视图(使用“开始”按钮):
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
// create the start controller
self.startController = [[StartController alloc] init];
// transfer to it - not animated because it's the first view
[navController pushViewController:startController animated:NO];
// add the current nav controller view to the window view heirarchy
// [window addSubview:navController.view];
[self.window setRootViewController:startController];
// release becasause now the navController has it
[startController release];
// show the start controller
[self.window makeKeyAndVisible];
return YES;
}
供参考,这是app delegate header中navController的声明:
@interface QuizAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UINavigationController *navController;
StartController *startController;
}
@property (readonly) BOOL iPad;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) StartController *startController;
@property (nonatomic, retain) IBOutlet UINavigationController *navController;
以下是实施中的声明:
@implementation QuizAppDelegate
@synthesize window;
@synthesize startController;
@synthesize navController;
我尽量不发布太多代码,因为害怕模糊问题,但如果要求我会添加它。任何想法可能是什么问题?