Selecting different storyboards based on device type

问题

I have a universal app in which I'm loading my main storyboard manually in application:didFinishLaunchingWithOptions.

I have 2 storyboards for iPhone and iPad which have the ~iPhone and ~iPad suffixes. I'm loading my storyboard using:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
self.initialViewController = [storyboard instantiateInitialViewController];

This prints Unknown class ViewController in Interface Builder file. to the console, so apparently it's not loading the correct storyboard. However, when I use [UIStoryboard storyboardWithName:@"MainStoryboard~iPhone" bundle:nil]; it works fine, but of course will work only for iPhone.

What am I missing? How can I use the name suffixes to automatically select the correct storyboard?

回答1:

I am not aware of any automatic selection of storyboards based on their filename suffix. You can use userInterfaceIdiom to select for iPad vs iPhone:

if ([[UIDevice currentDevice] userInterfaceIdiom] ==UIUserInterfaceIdiomPad) {
    UIStoryboard *storyboard = 
    [UIStoryboard storyboardWithName:@"MainStoryboard_iPad" bundle:nil];
} else {
    [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];
}

But if you are doing this to start up with a specifc view controller, all you need to do is drag the 'start' arrow to your preferred view controller in the storyboard

Or - select the view controller in the storyboard, go to the attributes instpector and tick isInitialViewController

回答2:

This is another thing you can set directly within your info.plist file. No need for any programming efforts. Look for the property named 'Main storyboard file base name' that will have 'Main' in it by default.

You can add another property named 'Main storyboard file base name (iPad)' that will then get used for iPad.

This is what the raw output in the plist looks like:

<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIMainStoryboardFile~ipad</key>
<string>iPad</string>

Afaik it is also possible to simply add a second storyboard named Main~iPad.storyboard (if the UIMainStoryboardFile key is set as Main). And that will get picked up for iPads. Haven't tested this in a while though.

回答3:

// In appdelegate class, while launching application select specified story board.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        UIStoryboard *storyboard1;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
    {
        storyboard1 = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:[NSBundle mainBundle]];
    }
    else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        storyboard1 = [UIStoryboard storyboardWithName:@"Main_iPad" bundle:[NSBundle mainBundle]];
    }
    UIViewController *vc = [storyboard instantiateInitialViewController];

    // Set root view controller and make windows visible
    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];

    return YES;
}

回答4:

You can name your storyboard like this

Main.storyboard (for iPhone)
Main_iPad.storyboard (for iPad)

and select them like this

- (UIStoryboard *)deviceStoryboardWithName:(NSString *)name bundle:(NSBundle *)bundle {
    if (IS_IPAD) {
        NSString *storyboardIpadName = [NSString stringWithFormat:@"%@_iPad", name];
        NSString *path = [[NSBundle mainBundle] pathForResource:storyboardIpadName ofType:@"storyboardc"];

        if (path.length > 0) {
            return [UIStoryboard storyboardWithName:storyboardIpadName bundle:bundle];
        }
    }


    return [UIStoryboard storyboardWithName:name bundle:bundle];
}

来源：https://stackoverflow.com/questions/14672023/selecting-different-storyboards-based-on-device-type

标签

iphone

ios

uistoryboard