Change the Width of Master in Uisplitviewcontroller

Change the width of Master in UISplitViewController

If you subclass UISplitViewController, you can implement -viewDidLayoutSubviews and adjust the width there. This is clean, no hacks or private APIs, and works even with rotation.

- (void)viewDidLayoutSubviews
{
    const CGFloat kMasterViewWidth = 240.0;

    UIViewController *masterViewController = [self.viewControllers objectAtIndex:0];
    UIViewController *detailViewController = [self.viewControllers objectAtIndex:1];

    if (detailViewController.view.frame.origin.x > 0.0) {
        // Adjust the width of the master view
        CGRect masterViewFrame = masterViewController.view.frame;
        CGFloat deltaX = masterViewFrame.size.width - kMasterViewWidth;
        masterViewFrame.size.width -= deltaX;
        masterViewController.view.frame = masterViewFrame;

        // Adjust the width of the detail view
        CGRect detailViewFrame = detailViewController.view.frame;
        detailViewFrame.origin.x -= deltaX;
        detailViewFrame.size.width += deltaX;
        detailViewController.view.frame = detailViewFrame;

        [masterViewController.view setNeedsLayout];
        [detailViewController.view setNeedsLayout];
    }
}

How to change width sizes of split view controller items (Master View Controller - Detail View Controller)?

The class UISplitViewController exposes a property to change the width of the master view. This property is preferredPrimaryColumnWidthFraction with which you can specify the width of the master view as a percentage respect the total width of the split view.

Resize master and detail view controllers in a split view controller?

Edit:
In iOS 8+, the relative widths can be changed by specifying the minimum/maximumPrimaryColumnWidth properties or the preferredPrimaryColumnFraction.

The below answer is still true for iOS < 8:

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You can't change the sizes for a split view controller.

See here: http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html

"The UISplitViewController class is a container view controller that manages two panes of information. The first pane has a fixed width of 320 points and a height that matches the visible window height. The second pane fills the remaining space."

Refresh UISplitViewController after changing the Master's width

This works for me:

[splitViewController.view setNeedsLayout];

I use it to show/hide the MasterViewContoller in landscape mode.

iOS SplitViewController: Show master view when loading in compact width

You should use method

func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool

which provided by UISplitViewControllerDelegate

Open UISplitViewController to Master View rather than Detail

Swift

UISplitViewController display master view above detail in portrait orientation is not about showing the Master view, it is about presenting the Detail view in full width, underneath the Master view.

UISplitViewController in portrait on iPhone shows detail VC instead of master is about the principle of the collapse mechanism.

This present answer addresses:

• Master → Detail (Compact width)
  
  
  • iPhone 4s, 5, 5s, SE, 6, 6s, 7 (any orientation)
  • iPod Touch
  • any iPhone Plus (portrait)
• side-by-side (all other sizes)
  
  
  • iPad
  • any iPhone Plus (landscape)

You must set preferredDisplayMode. You would want is .primaryVisible if it existed! Using .allVisible, iOS picks Detail if only 1 view fits (Compact width); in that size, the code below will pick Master.

The trick is to change both the preferredDisplayMode to .allVisible and to return true in collapseSecondary:onto.

class PrimarySplitViewController: UISplitViewController,
                                  UISplitViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.delegate = self
        self.preferredDisplayMode = .allVisible
    }

    func splitViewController(
             _ splitViewController: UISplitViewController,
             collapseSecondary secondaryViewController: UIViewController,
             onto primaryViewController: UIViewController) -> Bool {
        // Return true to prevent UIKit from applying its default behavior
        return true 
    }
}

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