Sometime startup with nothing but blank screen

#6 · closed · 9 comments

flypigz

My codes runs fine with the initial version of PaperFoldMenuController, but after replaced with the latest version, sometime it startup with nothing but blank screen. When I try to pause this app in Xcode debug window, it show that the callstack: semaphore_wait_trap NSOperation start PaperFoldMenuController viewDidLoad I guess this is because the viewDidLoadBlockOperation, which is newly introduced.

Comments

honcheng

Hi flypigz, Thanks. I'll check with the contributor what that does. On 26 Nov, 2012 2:17 AM, flypigz wrote:

honcheng

Are you using code or IB?

lxcid

Hi flypigz, That was a code I introduced, it was meant to defer the setting of `selectedIndex` until viewDidLoad. Could you share how you initialise the PaperFoldVC code? Its weird that it got stuck there. I knew that this is running on a separate thread but on my test it doesn't seems to cause issue. I'll try to send a fix for that today that make it run on the current thread.

flypigz

I tried the demo many times, there is no such issue, I am not sure if this is because the demo view controller is too simple, and nothing to load. Pure code, no IB. Here are my init codes. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. // custom initialization [self setupDatabase]; [self applyStylesheet]; [self appStartup]; self.window.backgroundColor = [UIColor blackColor]; [self.window makeKeyAndVisible]; return YES; } #pragma mark #pragma mark - Application's Startup /////////////////////////////////////////////////////////////////////////////////////////////////// - (void)appStartup { _menuController = [[MenuViewController alloc] initWithMenuWidth:200.0 numberOfFolds:3]; [self.window setRootViewController:_menuController]; StartupViewController *startupVC = [[StartupViewController alloc] init]; UINavigationController *startupNav = [[UINavigationController alloc] initWithRootViewController:startupVC]; ThemesSettingViewController *themesVC = [[ThemesSettingViewController alloc] init]; UINavigationController *themesNav = [[UINavigationController alloc] initWithRootViewController:themesVC]; SettingsViewController *settingsVC = [[SettingsViewController alloc] init]; UINavigationController *settingsNav = [[UINavigationController alloc] initWithRootViewController:settingsVC]; HelpViewController *helpVC = [[HelpViewController alloc] init]; UINavigationController *helpNAV = [[UINavigationController alloc] initWithRootViewController:helpVC]; NSMutableArray *viewControllers = [NSMutableArray arrayWithObjects:startupNav, themesNav, settingsNav, helpNAV, nil]; [_menuController setViewControllers:viewControllers]; }

lxcid

Give me about an hour. I made a minor change to the way I handles deferring of setting selected Index and see if it helps. :) Cheers! ## Stan Chang Khin Boon Sent with Sparrow (http://www.sparrowmailapp.com/?sig) On Monday, 26 November, 2012 at 11:06 AM, flypigz wrote: > I tried the demo many times, there is no such issue, I am not sure if this is because the demo view controller is too simple, and nothing to load. > Pure code, no IB. Here are my init codes. > (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions > { > self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; > // Override point for customization after application launch. > // custom initialization > [self setupDatabase]; > [self applyStylesheet]; > [self appStartup]; > self.window.backgroundColor = [UIColor blackColor]; > [self.window makeKeyAndVisible]; > return YES; > } > #pragma mark > #pragma mark - Application's Startup > /////////////////////////////////////////////////////////////////////////////////////////////////// > (void)appStartup { > _menuController = [[MenuViewController alloc] initWithMenuWidth:200.0 numberOfFolds:3]; > [self.window setRootViewController:_menuController]; > StartupViewController *startupVC = [[StartupViewController alloc] init]; > UINavigationController *startupNav = [[UINavigationController alloc] initWithRootViewController:startupVC]; > ThemesSettingViewController *themesVC = [[ThemesSettingViewController alloc] init]; > UINavigationController *themesNav = [[UINavigationController alloc] initWithRootViewController:themesVC]; > SettingsViewController *settingsVC = [[SettingsViewController alloc] init]; > UINavigationController *settingsNav = [[UINavigationController alloc] initWithRootViewController:settingsVC]; > HelpViewController *helpVC = [[HelpViewController alloc] init]; > UINavigationController *helpNAV = [[UINavigationController alloc] initWithRootViewController:helpVC]; > NSMutableArray *viewControllers = [NSMutableArray arrayWithObjects:startupNav, themesNav, settingsNav, helpNAV, nil]; > [_menuController setViewControllers:viewControllers]; > } > > — > Reply to this email directly or view it on GitHub (https://github.com/honcheng/PaperFoldMenuController/issues/6#issuecomment-10703082).

flypigz

Hi, lxcid, I think it is a good idea to let all init stuffs run on the current thread, I don't know the reason but I guess this should be the root cause.....Thank you. Actually the initial version works fine, the only “issue” is that it do some view creation stuffs in the "- (id)initWithMenuWidth:(float)menuWidth numberOfFolds:(int)numberOfFolds" method. It is not elegant but it works.