iPhone - 在應用程序啓動過程中，應用程序進入背景

Question

最近我遇到了一個問題，我的應用程序在初次啓動時進入後臺，但這隻發生在iOS4的iPhone 4S上。我已經進行了測試：

• 模擬器，具有不同的硬件/軟件配置
• iPhone 5（的iOS 6）
• iPhone 4S（的iOS 5.1）
• 的iPad2（iOS 6中）

並且它們都在使用它們，但是在iOS6的iPhone 4S上，應用程序的啓動在進入後臺之前大約需要20秒，如果您在幾秒鐘後「重新啓動」應用程序，您會發現它仍然存在運行和工作沒有任何問題。

是否有任何知道iPhone4S（iOS6）的問題，導致這種情況或有什麼特別的這種模式？ [我已經測試了不同的iPhone4s（iOS6的），它是發生在所有的人]

編輯

我發現了一些奇怪的意願做一些更多的測試，iPhone 4S（iOS6的）是唯一一個不顯示加載屏幕（第一視圖控制器），它只顯示啓動圖像。不管怎麼樣，這裏是在AppDelegate中和第一視圖控制器代碼：

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    // Override point for customization after application launch. 
    // Optional: automatically track uncaught exceptions with Google Analytics. 
    [GAI sharedInstance].trackUncaughtExceptions = YES; 
    // Optional: set Google Analytics dispatch interval to e.g. 20 seconds. 
    [GAI sharedInstance].dispatchInterval = 20; 
    // Optional: set debug to YES for extra debugging information. 
    [GAI sharedInstance].debug = NO; 
    // Create tracker instance. 
    __unused id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingId:@"UA-APP-ID"]; 
    return YES; 
} 

EcraPrincipalViewController.m

#import "EcraPrincipalViewController.h" 
#import "ListaPercursosTableViewController.h" 
#import "GlobalVars.h" 
#import "AppDelegate.h" 

@interface EcraPrincipalViewController() 

@end 

@implementation EcraPrincipalViewController 
{ 
    int progresso; 
    int sizePercursos; 
} 

@synthesize lbl_versao; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    self.trackedViewName = @"iPhone - EcrãPrincipal"; 
    // Do any additional setup after loading the view. 

    NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]]; 
    UIStoryboard *story = [UIStoryboard storyboardWithName:@"WalkMeStoryBoard" bundle:nil]; 
    ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:@"view_lista"]; 
    [views replaceObjectAtIndex:0 withObject:listaV]; 
    [self.navigationController setViewControllers:views]; 

    lbl_info.text = NSLocalizedString(@"downloading", NULL); 
    lbl_versao.text = NSLocalizedString(@"walkme_versao", NULL); 

    dispatch_queue_t queue = dispatch_queue_create("com.WalkMe.downloadPercursos", NULL); 
    dispatch_async(queue, ^{ 
     [[GlobalVars Instance] getLevadas:self]; 
    }); 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 

- (BOOL)shouldAutorotate 
{ 
    return [[GlobalVars Instance] podeRodar]; 
} 

- (NSUInteger)supportedInterfaceOrientations 
{ 
    return UIInterfaceOrientationMaskPortrait; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

-(void)novaAtualizacao 
{ 
    NSLog(@"Atualização encontrada"); 
    lbl_info.text = NSLocalizedString(@"atualizacao_encontrada", NULL); 
} 
-(void)atualizarPercursosInternos 
{ 
    NSLog(@"VERIFICAÇAO Interna"); 
    lbl_info.text = NSLocalizedString(@"a_atualizar_percursos", NULL); 
} 
-(void)setNewDownload:(NSNumber*)size 
{ 
    NSLog(@"Iniciou VERIFICAÇAO"); 
    progresso = 0; 
    sizePercursos = [size intValue]; 
    lbl_info.text = [NSString stringWithFormat:@"%@ 0/%d", NSLocalizedString(@"novos_percursos", NULL), sizePercursos]; 
} 
-(void)setProgress 
{ 
    NSLog(@"Progresso"); 
    progresso++; 
    lbl_info.text = [NSString stringWithFormat:@"%@ %d/%d", NSLocalizedString(@"novos_percursos", NULL), progresso, sizePercursos]; 
} 
-(void)goToLista 
{ 
    NSLog(@"ACABOU VERIFICAÇAO"); 

    UIStoryboard *story = [UIStoryboard storyboardWithName:@"WalkMeStoryBoard" bundle:nil]; 
    [[GlobalVars Instance] getLevadas]; 
    [self.navigationController pushViewController:[story instantiateViewControllerWithIdentifier:@"view_lista"] animated:NO]; 
} 

- (void)viewDidUnload { 
    [self setLbl_versao:nil]; 
    [super viewDidUnload]; 
} 
@end 

非常感謝您對我們的關注和幫助:)

Answer 1

雖然試圖弄清楚發生了什麼事情，在意見的問題提出的建議讓我意識到由於某種原因，應用程序調用了相同的方法兩次，並由於某種原因導致應用程序轉到後臺。

爲了解決這個問題，簡單地從viewDidLoad中

NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]]; 
    UIStoryboard *story = [UIStoryboard storyboardWithName:@"WalkMeStoryBoard" bundle:nil]; 
    ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:@"view_lista"]; 
    [views replaceObjectAtIndex:0 withObject:listaV]; 
    [self.navigationController setViewControllers:views]; 

刪除此行並將其添加到goToLista（初始加載完成後，這就是所謂的）。

我結束了：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    self.trackedViewName = @"iPhone - EcrãPrincipal"; 
    // Do any additional setup after loading the view. 

    lbl_info.text = NSLocalizedString(@"downloading", NULL); 
    lbl_versao.text = NSLocalizedString(@"walkme_versao", NULL); 

    dispatch_queue_t queue = dispatch_queue_create("com.WalkMe.downloadPercursos", NULL); 
    dispatch_async(queue, ^{ 
     [[GlobalVars Instance] getLevadas:self]; 
    }); 
} 

-(void)goToLista 
{ 
    NSLog(@"ACABOU VERIFICAÇAO"); 

    [[GlobalVars Instance] getLevadas]; 

    NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]]; 
    UIStoryboard *story = [UIStoryboard storyboardWithName:@"WalkMeStoryBoard" bundle:nil]; 
    ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:@"view_lista"]; 
    [views replaceObjectAtIndex:0 withObject:listaV]; 
    [self.navigationController setViewControllers:views]; 
    [self.navigationController pushViewController:[story instantiateViewControllerWithIdentifier:@"view_lista"] animated:NO]; 
} 

這解決了問題，但我不知道爲什麼。如果有人知道，請告訴，因爲我真的很想知道。

謝謝:)