uipopovercontroller - 在 iOS8 : UIPopoverController presentPopoverFromRect not work for keyWindow any more

Question

如上所述，在 iOS8 中，[UIPopoverController presentPopoverFromRect] 不再适用于 [UIApplication sharedApplication].keyWindow。 (它确实适用于 iOS7)

我验证了以下代码:

TestViewController *test = [[TestViewController alloc] initWithNibName:nil bundle:nil];

if (testPopoverController == nil) {
    testPopoverController = [[UIPopoverController alloc] initWithContentViewController:test];
    testPopoverController.popoverContentSize = CGSizeMake(250, 95*5);


}

CGPoint point = [sender convertPoint:CGPointMake(0, 0) toView:nil];
CGRect rect = CGRectMake(point.x, point.y, 24, 24);

[testPopoverController presentPopoverFromRect:rect inView:[UIApplication sharedApplication].keyWindow permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];

Answer 1

我想出的最佳解决方案是有条件地处理它。如果在 iOS 7 上，请使用我们在关键窗口上显示 UIPopoverController 的工作代码。如果在 iOS 8 上，请使用以下命令:

     viewController.modalPresentationStyle = UIModalPresentationPopover;
     UIPopoverPresentationController *presentationController = viewController.popoverPresentationController;
     [presentationController setDelegate:self];
     presentationController.permittedArrowDirections = 0;
     presentationController.sourceView = [[UIApplication sharedApplication] keyWindow];
     presentationController.sourceRect = [[UIApplication sharedApplication] keyWindow].bounds;

     [viewController setPreferredContentSize:CGSizeMake(320, 480)];
     [parentController presentViewController:viewController animated:YES completion:nil];

这最终与以下功能相同:

     self.popoverController = [[UIPopoverController alloc] initWithContentViewController:viewController];
     [self.popoverController setDelegate:self];
     [self.popoverController setPopoverContentSize:isLandscape() ? CGSizeMake(480*2, 320*2) : CGSizeMake(320*2, 480*2)];
     [self.padPopover presentPopoverFromRect:CGSizeMake(320, 480)
                                      inView:[[UIApplication sharedApplication] keyWindow]
                    permittedArrowDirections:0
                                    animated:YES];