问题
I have an iOS7 application, which was based on the Xcode master-detail template, that I am porting to iOS8. One area that has changed a lot is the UISplitViewController.
When in portrait mode, if the user taps on the detail view controller, the master view controller is dismissed:
I would also like to be able to programmatically hide the master view controller if the user taps on a row.
In iOS 7, the master view controller was displayed as a pop-over, and could be hidden as follows:
[self.masterPopoverController dismissPopoverAnimated:YES];
With iOS 8, the master is no longer a popover, so the above technique will not work.
I've tried to dismiss the master view controller:
self.dismissViewControllerAnimated(true, completion: nil)
Or tell the split view controller to display the details view controller:
self.splitViewController?.showDetailViewController(bookViewController!, sender: self)
But nothing has worked so far. Any ideas?
回答1:
Extend the UISplitViewController as follows:
extension UISplitViewController {
func toggleMasterView() {
let barButtonItem = self.displayModeButtonItem()
UIApplication.sharedApplication().sendAction(barButtonItem.action, to: barButtonItem.target, from: nil, forEvent: nil)
}
}
In didSelectRowAtIndexPath or prepareForSegue, do the following:
self.splitViewController?.toggleMasterView()
This will smoothly slide the master view out of the way.
I got the idea of using the displayModeButtonItem() from this post and I am simulating a tap on it per this post.
I am not really happy with this solution, since it seems like a hack. But it works well and there seems to be no alternative yet.
回答2:
Use preferredDisplayMode. In didSelectRowAtIndexPath or prepareForSegue:
self.splitViewController?.preferredDisplayMode = .PrimaryHidden
self.splitViewController?.preferredDisplayMode = .Automatic
Unfortunately the master view abruptly disappears instead of sliding away, despite the documentation stating:
If changing the value of this property leads to an actual change in the current display mode, the split view controller animates the resulting change.
Hopefully there is a better way to do this that actually animates the change.
回答3:
I was able to have the desired behavior in a Xcode 6.3 Master-Detail Application (universal) project by adding the following code in the MasterViewController's - prepareForSegue:sender: method:
if view.traitCollection.userInterfaceIdiom == .Pad && splitViewController?.displayMode == .PrimaryOverlay {
let animations: () -> Void = {
self.splitViewController?.preferredDisplayMode = .PrimaryHidden
}
let completion: Bool -> Void = { _ in
self.splitViewController?.preferredDisplayMode = .Automatic
}
UIView.animateWithDuration(0.3, animations: animations, completion: completion)
}
The complete - prepareForSegue:sender: implementation should look like this:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let indexPath = self.tableView.indexPathForSelectedRow() {
let object = objects[indexPath.row] as! NSDate
let controller = (segue.destinationViewController as! UINavigationController).topViewController as! DetailViewController
controller.detailItem = object
controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem()
controller.navigationItem.leftItemsSupplementBackButton = true
if view.traitCollection.userInterfaceIdiom == .Pad && splitViewController?.displayMode == .PrimaryOverlay {
let animations: () -> Void = {
self.splitViewController?.preferredDisplayMode = .PrimaryHidden
}
let completion: Bool -> Void = { _ in
self.splitViewController?.preferredDisplayMode = .Automatic
}
UIView.animateWithDuration(0.3, animations: animations, completion: completion)
}
}
}
}
Using traitCollection may also be an alternative/supplement to displayMode in some projects. For example, the following code also works for a Xcode 6.3 Master-Detail Application (universal) project:
let traits = view.traitCollection
if traits.userInterfaceIdiom == .Pad && traits.horizontalSizeClass == .Regular {
let animations: () -> Void = {
self.splitViewController?.preferredDisplayMode = .PrimaryHidden
}
let completion: Bool -> Void = { _ in
self.splitViewController?.preferredDisplayMode = .Automatic
}
UIView.animateWithDuration(0.3, animations: animations, completion: completion)
}
回答4:
The code below hides the master view with animation
UIView.animateWithDuration(0.5) { () -> Void in
self.splitViewController?.preferredDisplayMode = .PrimaryHidden
}
回答5:
Just improving a little bit the answers listed here already, the following code is working properly for me, and it also handles the animation smoothly:
extension UISplitViewController {
func toggleMasterView() {
var nextDisplayMode: UISplitViewControllerDisplayMode
switch(self.preferredDisplayMode){
case .PrimaryHidden:
nextDisplayMode = .AllVisible
default:
nextDisplayMode = .PrimaryHidden
}
UIView.animateWithDuration(0.5) { () -> Void in
self.preferredDisplayMode = nextDisplayMode
}
}
}
and then, as mentioned, you just use the extended function anywhere in your View controllers
self.splitViewController?.toggleMasterView()
回答6:
Modifying the answers above this is all I needed in a method of my detail view controller that configured the view:
[self.splitViewController setPreferredDisplayMode:UISplitViewControllerDisplayModePrimaryHidden];
Of course it lacks the grace of animation.
回答7:
try
let svc = self.splitViewController svc.preferredDisplayMode = UISplitViewControllerDisplayMode.PrimaryHidden
回答8:
Swift 4 update:
Insert it into prepare(for segue: ...
if splitViewController?.displayMode == .primaryOverlay {
let animations: () -> Void = {
self.splitViewController?.preferredDisplayMode = .primaryHidden
}
let completion: (Bool) -> Void = { _ in
self.splitViewController?.preferredDisplayMode = .automatic
}
UIView.animate(withDuration: 0.3, animations: animations, completion: completion)
}
回答9:
My solution in the Swift 1.2
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
var screen = UIScreen.mainScreen().currentMode?.size.height
if (UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad) || screen >= 2000 && UIDevice.currentDevice().orientation.isLandscape == true && (UIDevice.currentDevice().userInterfaceIdiom == .Phone){
performSegueWithIdentifier("showDetailParse", sender: nil)
self.splitViewController?.preferredDisplayMode = UISplitViewControllerDisplayMode.PrimaryHidden
} else if (UIDevice.currentDevice().userInterfaceIdiom == .Phone) {
performSegueWithIdentifier("showParse", sender: nil)
}
}
回答10:
for iPad add Menu button like this
UIBarButtonItem *menuButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"burger_menu"]
style:UIBarButtonItemStylePlain
target:self.splitViewController.displayModeButtonItem.target
action:self.splitViewController.displayModeButtonItem.action];
[self.navigationItem setLeftBarButtonItem:menuButtonItem];
This work great with both landscape and portrait mode. To programmatically close the popover vc you just need to force the button action like this
[self.splitViewController.displayModeButtonItem.target performSelector:appDelegate.splitViewController.displayModeButtonItem.action];
来源：https://stackoverflow.com/questions/27243158/hiding-the-master-view-controller-with-uisplitviewcontroller-in-ios8