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objective-c – UISplitViewController：如何呈现popover？

HTML5 发布时间：2022-04-27 发布网站：大佬教程 code.js-code.com

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我有一个UISplitViewController,它是一个带有以下委托方法的UISplitViewControllerDelegate：

当iPad在PorTrait中启动时,我希望可以看到SplitView中的Popover.我怎样才能做到这一点？

- (void)splitViewController:(UISplitViewController *)svc
     willHideViewController:(UIViewController *)aViewController
          withBarButtonItem:(UIBarButtonItem *)barButtonItem
       forPopoverController:(UIPopoverController *)pc
{
    //setTing the barButtonItem in the toolbar in the detail view.

    [pc presentPopoverFromBarButtonItem:barButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:NO];
}

但上面的代码给了我以下错误：

解决方法

只有一个问题,错误的地方调用presentPopover方法,splitViewController：* WillHide * ViewController …….所以,barButtonItem存在但不存在于屏幕上.我使用下一个代码,它对我有用.
对于处理所有情况,您需要使用2种方法.

- (void)viewDidAppear:(BOOL)animated
{
    if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPorTrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPorTraitUpsideDown) {
        if (self.view.window != nil) {
            [_masterPopoverController presentPopoverFromRect:CGRectMake(0,1,1) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:NO];
        }
    }
    [super viewDidAppear:animated];
}

和

-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    if (fromInterfaceOrientation == UIDeviceOrientationLandscapeLeft || fromInterfaceOrientation == UIDeviceOrientationLandscapeRight) {
        if (self.view.window != nil) {
            [_masterPopoverController presentPopoverFromRect:CGRectMake(0,1) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:NO];
        }
    }
}