如何创建将在 iPad 上使用弹出窗口并推送到 iPhone 上的导航堆栈的 segue?

How can I create a segue that will use a popover on iPad, and push onto the navigation stack on the iPhone?

在我的应用程序中,某些视图控制器在 iPad(或更具体地说,常规水平尺寸 class)上将它们呈现为弹出窗口是有意义的,但在 iPhone(或紧凑的水平尺寸 class)将它们推到导航堆栈上是有意义的。有没有一种优雅的方式来支持这个?默认情况下,如果我使用 "Present as Popover" segue,它将在 iPhone 上模态显示,这不是我想要的。

我找到了一种方法来获得我想要的行为,但它很丑陋而且似乎容易出错。我根据当前大小 class 在两个不同的 segue 之间进行选择。为了支持 iOS 9 多任务处理,我实现了 [UIViewController willTransitionToTraitCollection:withTransitionCoordinator] 并在弹出窗口和弹出窗口之间手动移动视图控制器导航控制器(这部分似乎特别容易出错)。

似乎应该有一些简单的方法来实现自定义 segue 来处理这个问题,或者实现某种自定义自适应表示控制器,但我一直无法理解它。有人成功过吗?

在我看来这是最简单的方法,

第 1 步:创建从一个控制器到另一个控制器的两个 segue。
第 2 步: 将一个 segue 的 segue 属性 设置为另一个
的 push 和 popover 第 3 步: 现在根据您的要求调用执行 segue,i.e.iPad 或 iPhone

这里是a sample code

示例代码注意:将 bool 条件更改为 false 以检查 didSelectRowAtIndexPath.

中的另一个条件

这是我最终构建的内容。我对它不是很满意,这就是为什么我直到现在才发布它。它不支持使用相同 class 查看控​​制器的两个 segue,并且它需要您自己跟踪弹出窗口的源矩形和源视图。但也许这对其他人来说是一个很好的起点。

PushPopoverSegue.swift

import UIKit

class PushPopoverSegue: UIStoryboardSegue {

    var sourceBarButtonItem: UIBarButtonItem!
    var permittedArrowDirections: UIPopoverArrowDirection = .Any

    override func perform() {
        assert( self.sourceViewController.navigationController != nil )
        assert( self.sourceBarButtonItem != nil )

        if self.sourceViewController.traitCollection.horizontalSizeClass == .Compact {
            self.sourceViewController.navigationController!.pushViewController(self.destinationViewController, animated: true)
        }
        else {
            let navigationController = UINavigationController(rootViewController: self.destinationViewController)
            let popover = UIPopoverController(contentViewController: navigationController)
            popover.presentPopoverFromBarButtonItem(self.sourceBarButtonItem, permittedArrowDirections: self.permittedArrowDirections, animated: true)
        }
    }

}

UIViewController+PushPopoverTransition.h

#import <UIKit/UIKit.h>

@interface UIViewController (PushPopoverTransition)

- (void) transitionPushPopoversToHorizontalSizeClass: (UIUserInterfaceSizeClass) sizeClass withMapping: (NSDictionary*) mapping;

@end

UIViewController+PushPopoverTransition.m

#import "UIViewController+PushPopoverTransition.h"

@implementation UIViewController (PushPopoverTransition)

- (void) transitionPushPopoversToHorizontalSizeClass: (UIUserInterfaceSizeClass) sizeClass withMapping: (NSDictionary*) mapping
{
    if ( sizeClass == UIUserInterfaceSizeClassCompact )
    {
        if ( self.presentedViewController == nil )
            return;

        NSParameterAssert( [self.presentedViewController isKindOfClass:[UINavigationController class]] );
        UINavigationController* navigationController = (UINavigationController*) self.presentedViewController;
        NSArray* viewControllers = navigationController.viewControllers;
        UIViewController* topOfStack = viewControllers[0];

        if ( [mapping.allKeys containsObject:NSStringFromClass( [topOfStack class] ) ] )
        {
            [self.presentedViewController dismissViewControllerAnimated:NO completion:^{
                for ( UIViewController* viewController in viewControllers )
                    [self.navigationController pushViewController:viewController animated:NO];
            }];
        }
    }
    else if ( sizeClass == UIUserInterfaceSizeClassRegular )
    {
        NSUInteger indexOfSelf = [self.navigationController.viewControllers indexOfObject:self];

        if ( indexOfSelf < self.navigationController.viewControllers.count  - 1 )
        {
            UIViewController* topOfStack = self.navigationController.viewControllers[indexOfSelf + 1];
            if ( [mapping.allKeys containsObject:NSStringFromClass( [topOfStack class] )] )
            {
                NSArray* poppedControllers = [self.navigationController popToViewController:self animated:NO];
                UINavigationController* navigationController = [[UINavigationController alloc] init];
                navigationController.modalPresentationStyle = UIModalPresentationPopover;
                navigationController.viewControllers = poppedControllers;

                id popoverSource = mapping[NSStringFromClass( [topOfStack class] )];
                if ( [popoverSource isKindOfClass:[UIBarButtonItem class]] )
                {
                    navigationController.popoverPresentationController.barButtonItem = popoverSource;
                }
                else if ( [popoverSource isKindOfClass:[NSArray class]] )
                {
                    NSArray* popoverSourceArray = (NSArray*) popoverSource;
                    NSParameterAssert(popoverSourceArray.count == 2);
                    UIView* sourceView = popoverSourceArray[0];
                    CGRect sourceRect = [(NSValue*) popoverSourceArray[1] CGRectValue];
                    navigationController.popoverPresentationController.sourceView = sourceView;
                    navigationController.popoverPresentationController.sourceRect = sourceRect;
                }

                [self presentViewController:navigationController animated:NO completion:nil];
            }
        }
    }
}

@end

示例用法

在 interface builder 中创建一个 segue,并将其 "Kind" 设置为 Custom,并将其 "Class" 设置为 PushPopoverSegue

ViewController.m

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    ((PushPopoverSegue*) segue).sourceView = /* source view */;
    ((PushPopoverSegue*) segue).sourceRect = /* source rect */;
}

-(void) willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    if ( newCollection.horizontalSizeClass == UIUserInterfaceSizeClassUnspecified )
        return;

    [self transitionPushPopoversToHorizontalSizeClass:newCollection.horizontalSizeClass withMapping:@{
        @"MyDestinationViewController": @[ /* source view */,
                                       [NSValue valueWithCGRect:/* source rect*/] ]
    }];
}