SplitViewController with a Login View Controller as the root

Question

So I've been researching on how to make a login view controller as the initial view controller instead of the splitview.

Some of the answers I've seen would recommend a modal view to be loaded? I'm not sure how that is set up.

eg.

How to add a login view before a UISplitViewController iPad

and

How to implement SplitViewController on second level.?

So do I add those on the loginviewcontroller class? Or where?

Any advice is welcome.

Thanks!!

Answer 1

I've done this by creating two storyboards: one with the (full-screen) login and one with the split-view.

To switch between them, I've added a custom protocol:

#import <Foundation/Foundation.h>

@protocol RootViewControllerDelegate <NSObject>

-(void)switchToStoryboard: (UIStoryboard *) storyboad animationDirectionOrNil: (NSString *)direction;

@end

The AppDelegate then implements this protocol:

-(void)switchToStoryboard:(id)storyboad animationDirectionOrNil:(NSString *)direction {
    UIViewController *newRoot=[storyboad instantiateInitialViewController];
    if ([newRoot respondsToSelector:@selector(setRootViewControllerDelegate:)]) {
        [newRoot setRootViewControllerDelegate:self];
    }
    self.window.rootViewController=newRoot;

    if(direction){
        CATransition* transition=[CATransition animation];
        transition.type=kCATransitionPush;
        transition.subtype=direction;
        [self.window.layer addAnimation:transition forKey:@"push_transition"];
    }
}

As you can see, it tries to set itself as the delegate again, so the other view-controller can switch back or to another storyboard. In order for this to work, you would have to subclass UISplitView:

Header

#import <UIKit/UIKit.h>
#import "RootViewControllerDelegate.h"

@interface MySplitViewController : UISplitViewController
@property (nonatomic, weak) id <RootViewControllerDelegate> rootViewControllerDelegate;

@end

iMplementation

#import "MySplitViewController.h"

@implementation MySplitViewController
@synthesize rootViewControllerDelegate;

- (void)viewDidLoad
{
    [super viewDidLoad];
    for (UIViewController *viewController in self.viewControllers) {
        if ([viewController respondsToSelector:@selector(setRootViewControllerDelegate:)]) {
            [viewController setRootViewControllerDelegate:self.rootViewControllerDelegate];
        }
    }
}

@end

This simple implementation looks for child-view-controllers that accept a root-view-controller-delegate and hands it down. So when you want to add a "Show Login"-button to a certain (master- or detail-)view, just create your own UIViewController-subclass, add a @property id<RootViewControllerDelegate> rootViewControllerDelegate and associate an action like this with the button:

- (IBAction)loginButtonClicked:(id)sender {
    UIStoryboard *mainSB=[UIStoryboard storyboardWithName:@"LoginStoryboard" bundle:nil];
    NSString *animationDirection=kCATransitionFromTop;
    UIDeviceOrientation currentOrientation=[[UIDevice currentDevice] orientation];
    if (currentOrientation==UIDeviceOrientationLandscapeLeft) {
        animationDirection=kCATransitionFromBottom;
    }
    [self.rootViewControllerDelegate switchToStoryboard:mainSB animationDirectionOrNil:animationDirection];
}

Feel free to adjust everything to your needs.