应用程序关闭时 3D Touch UIapplicationShortcut 不起作用

Question

您好，提前致谢。

我编写了一个应用程序，它使用 3D 触摸在主屏幕上使用新的 UIApplicationShortcut。一旦应用成为应用，快捷方式就可以使用，但如果应用关闭，则快捷方式在主屏幕上不起作用。

当应用程序关闭时，快捷方式会启动应用程序，但快捷方式不起作用，只会启动应用程序。

这是我用于快捷方式的两种方法。

- (void)setupViewControllers {
    // setup the navigation stack

    CGSize iOSDeviceScreenSize = [[UIScreen mainScreen] bounds].size;
    if (iOSDeviceScreenSize.height == 480)
    {
        _navigationController = (UINavigationController *)self.window.rootViewController;

        // iPhone 5 and iPod Touch 5th generation: 4 inch screen
        // Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone4
        UIStoryboard *iPhone4Storyboard = [UIStoryboard storyboardWithName:@"Main4s" bundle:nil];

        UIViewController *initialViewController = [iPhone4Storyboard instantiateInitialViewController];
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        self.window.rootViewController  = initialViewController;

        self.myViewController = (ViewController *)_navigationController.topViewController;
        self.myViewController.managedObjectContext = self.managedObjectContext;

        [self.window makeKeyAndVisible];
    }

    if (iOSDeviceScreenSize.height == 568)
    {
        _navigationController = (UINavigationController *)self.window.rootViewController;

        // iPhone 5 and iPod Touch 5th generation: 4 inch screen
        // Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone4
        UIStoryboard *iPhone4Storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

        UIViewController *initialViewController = [iPhone4Storyboard instantiateInitialViewController];
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        self.window.rootViewController  = initialViewController;

        self.myViewController = (ViewController *)_navigationController.topViewController;
        self.myViewController.managedObjectContext = self.managedObjectContext;

        [self.window makeKeyAndVisible];
    }

    if (self.myViewController){NSLog(@"myViewController is not nil, setupViewControllers");}
    else
    {
        NSLog(@"myViewController is nil, setupViewControllers");//breakpoint inserted here...
    }
}

- (void)application:(UIApplication *)application performActionForShortcutItem:(UIApplicationShortcutItem *)shortcutItem completionHandler:(void (^)(BOOL))completionHandler {

    [self setupViewControllers];

    // react to shortcut item selections
    NSLog(@"A shortcut item was pressed. It was %@.", shortcutItem.localizedTitle);
    if([shortcutItem.localizedTitle isEqualToString:@"Scan Tag"])
    {
        [self.myViewController toggleScanningTapped:nil];
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Enter Tag"])
    {
        [self.myViewController manualEntry];
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Search for a Tag"]){
        [self.myViewController SearchSwitch];
        [self.myViewController toggleScanningTapped:nil];
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Just Scan & Copy"]){
        [self.myViewController justCopy];
    }

    if (self.myViewController){NSLog(@"myViewController is not nil, performActionForShortcutItem");}
    else
    {
        NSLog(@"myViewController is nil, performActionForShortcutItem");
    }
}


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    [self setupViewControllers];

    NSURL *url = (NSURL *)[launchOptions valueForKey:UIApplicationLaunchOptionsURLKey];
    if (url != nil && [url isFileURL]) {
        [self.myViewController handleOpenURL:url];
    }

    if (self.myViewController){NSLog(@"myViewController is not nil, didFinishLaunchingWithOptions");}
    else{NSLog(@"myViewController is nil, didFinishLaunchingWithOptions");}

    return YES;
}

这里是 plist 条目...

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <dict>
        <key>UIApplicationShortcutItemType</key>
        <string>com.PALIANTech.SUNYScanner.static1</string>
        <key>UIApplicationShortcutItemTitle</key>
        <string>Scan Tag</string>
        <key>UIApplicationShortcutItemSubtitle</key>
        <string>Add tag to DB</string>
        <key>UIApplicationShortcutItemIconFile</key>
        <string>barcode.png</string>
    </dict>
    <dict>
        <key>UIApplicationShortcutItemType</key>
        <string>com.PALIANTech.SUNYScanner.static2</string>
        <key>UIApplicationShortcutItemTitle</key>
        <string>Enter Tag</string>
        <key>UIApplicationShortcutItemSubtitle</key>
        <string>Manually add tag to DB</string>
        <key>UIApplicationShortcutItemIconFile</key>
        <string>ManualEntry.png</string>
    </dict>
    <dict>
        <key>UIApplicationShortcutItemType</key>
        <string>com.PALIANTech.SUNYScanner.static3</string>
        <key>UIApplicationShortcutItemTitle</key>
        <string>Search for a Tag</string>
        <key>UIApplicationShortcutItemSubtitle</key>
        <string>Scan a tag to search for</string>
        <key>UIApplicationShortcutItemIconFile</key>
        <string>search.png</string>
    </dict>
</array>
</plist>

任何帮助或建议将不胜感激。

Answer 1

原因是当您的应用程序重新启动时self.myViewController 在您检查performActionForShortcutItem 和didFinishLaunchingWithOptions 中的快捷方式时仍然是nil。所以什么都没有发生。

要解决此问题，您必须实例化 myViewController 并在通过快捷方式打开应用时将其添加到导航堆栈中。

编辑

这是一个有效的（精简版）版本：

AppDelegate

@interface AppDelegate ()
@property ViewController *viewController;
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [self setupViewControllers];

    return YES;
}

- (void)setupViewControllers {
    self.viewController = [[ViewController alloc] init];
    self.viewController.view.backgroundColor = [UIColor lightGrayColor];
    self.viewController.label.text = @"Normal Launch";
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];

    self.window.rootViewController  = navigationController;
    [self.window makeKeyAndVisible];
}

- (void)application:(UIApplication *)application performActionForShortcutItem:(UIApplicationShortcutItem *)shortcutItem completionHandler:(void (^)(BOOL))completionHandler {
    [self setupViewControllers];

    if([shortcutItem.localizedTitle isEqualToString:@"Scan Tag"]) {
        self.viewController.label.text = @"Shortcut: Scan Tag";
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Enter Tag"]) {
        self.viewController.label.text = @"Shortcut: Enter Tag";
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Search for a Tag"]) {
        self.viewController.label.text = @"Shortcut: Search Tag";
    }
    if([shortcutItem.localizedTitle isEqualToString:@"Just Scan & Copy"]) {
        self.viewController.label.text = @"Shortcut: Scan & Copy Tag";
    }
}

@end

ViewController 类是一个普通的UIViewController 子类，它只有一个用于演示目的的标签。

我已经使用后台应用程序测试了快捷方式，并且该应用程序已完全从内存中删除。两者都按预期工作。

更新

如果您使用情节提要中的 ViewController，您必须像这样初始化它：

- (void)setupViewControllers {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    self.viewController = (ViewController *)[storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    ...
}

不要忘记在情节提要中设置 ViewController 的标识符：