iOS 7 - Display a View as Portrait Only for application built in Xamarin

问题

I am developing an application for iOS in Xamarin, I have a login screen as my first view which I want to display as portrait only and the rest can do landscape or whatever.

As this is in C# these are the methods I have overridden in my ViewController but the view still rotates on my iPhone

public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations ()
{
    return UIInterfaceOrientationMask.Portrait;
}

public override bool ShouldAutorotate ()
{
    return false;
}

I am probably missing something very simple but I just can't get it to work.

I am also attempting to use AutoLayout if that makes any difference.

回答1:

First make sure you have checked all the orientations in General settings:

and in whatever UIViewController you wish only the portrait mode add the following snippet:

-(BOOL)shouldAutorotate
{
    return NO;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return UIInterfaceOrientationIsPortrait(interfaceOrientation);
}

回答2:

@user1049099 I'm using Xamarin too with a UIViewController, I managed to force portrait, but this only works on iPhone. On Ipad, if launching the app in landscape mode, it gets stuck.

[MonoTouch.ObjCRuntime.Since (7, 0)]
public override bool ShouldAutorotate ()
{
    return false;
}

public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations ()
{
    return UIInterfaceOrientationMask.Portrait;
}

public override UIInterfaceOrientation PreferredInterfaceOrientationForPresentation ()
{
    return UIInterfaceOrientation.Portrait;
}

When calling those three functions manually, they return false, Portrait and Portrait (in order) even if it's not the case on Ipad.

来源：https://stackoverflow.com/questions/21348964/ios-7-display-a-view-as-portrait-only-for-application-built-in-xamarin