弹出视图控制器，然后同时关闭前一个视图控制器
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【中文标题】弹出视图控制器，然后同时关闭前一个视图控制器【英文标题】：Pop view controller and then dismiss previous view controller simultaneously 【发布时间】：2016-12-01 17:32:51 【问题描述】：我的主视图控制器 A 呈现视图控制器 B，然后将视图控制器 C 推送到其（B 的）导航堆栈上。现在，从C，我希望能够直接到A。如果我从C运行dismissViewController，动画不流畅，如果我将C弹出到B然后关闭B，则有两个单独/不同的动画，其中我不想要。
有没有办法让我直接从 C 转到 A 而无需中间过渡？
因此，运行以下（从 C 开始）显示了一个突然的转换
[self dismissViewControllerAnimated:YES completion:nil];
而运行以下（从 C 中）显示两个单独的转换...
UIViewController *previousViewController = [self.navigationController.viewControllers
objectAtIndex:(self.navigationController.viewControllers.count - 2)];
[self.navigationController popViewControllerAnimated:YES];
[previousViewController dismissViewControllerAnimated:YES completion:nil];
【问题讨论】：
【参考方案1】：使用popToViewController:animated:
[self.navigationController popToViewController: self.navigationController.viewControllers.firstObject animated: YES];
或者，使用setViewControllers:animated:
NSMutableArray* viewControllers = [self.navigationController.viewControllers mutableCopy];
[viewControllers removeLastObject];
[viewControllers removeLastObject];
[self.navigationController setViewControllers: viewControllers animated: YES];
【讨论】：
非常感谢@TomSwift。这应该可行，但我的设置中还有另一个问题即将到来 - 我实际上创建了一个新的导航堆栈（从 A 呈现 B），因为我希望导航栏有所不同。所以当我弹出到 A 时，它只是崩溃了，因为 A 不在导航堆栈上！我需要进行相当多的重构，所以稍后可能会再次合并您的反馈。再次感谢！【参考方案2】：如果你的主控制器是你的根控制器，你可以使用
[self.navigationController popToRootViewControllerAnimated:YES];
【讨论】：
非常感谢@Flexicoder。害怕 A 不是根视图控制器 - 事实上，根据我对 Tom 的评论，我从 B 启动了一个新的导航堆栈，弹出到根视图控制器只会把我从 C 带到 B！再次感谢！【参考方案3】：为此创建了一个演示，“如果我从 C 运行dismissViewController，动画不流畅”发现动画足够流畅。
视图控制器 (Swift)
class ViewController: UIViewController
@IBAction func dismissAction(_ sender:UIBarButtonItem)
if let presentingViewController = navigationController?.presentingViewController as? ViewController
presentingViewController.dismiss(animated: true, completion: nil)
故事板（源代码）
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11542" systemVersion="16B2555" targetRuntime="ios.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="oLA-Di-cgf">
<device id="retina3_5" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="n0L-NI-h0u">
<objects>
<viewController id="oLA-Di-cgf" customClass="ViewController" customModule="test" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="r6P-JA-nnH"/>
<viewControllerLayoutGuide type="bottom" id="ahY-rd-YdT"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="85O-5M-YL1">
<rect key="frame" x="0.0" y="0.0" />
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<toolbar opaque="NO" clearsContextBeforeDrawing="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="O7h-fZ-9h7">
<rect key="frame" x="0.0" y="436" />
<items>
<barButtonItem title="Present" id="maa-Qr-JCa">
<connections>
<segue destination="Wca-5m-4jx" kind="presentation" id="CMi-Rw-iRx"/>
</connections>
</barButtonItem>
</items>
</toolbar>
</subviews>
<color key="backgroundColor" red="0.41568627450000001" green="0.77647058820000003" blue="0.62745098040000002" alpha="1" colorSpace="calibratedRGB"/>
<constraints>
<constraint firstItem="ahY-rd-YdT" firstAttribute="top" secondItem="O7h-fZ-9h7" secondAttribute="bottom" id="081-86-3ey"/>
<constraint firstItem="O7h-fZ-9h7" firstAttribute="leading" secondItem="85O-5M-YL1" secondAttribute="leading" id="Gxg-mQ-PmM"/>
<constraint firstAttribute="trailing" secondItem="O7h-fZ-9h7" secondAttribute="trailing" id="oeG-uG-4Z5"/>
</constraints>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="gfv-GB-jC7" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="3872" y="-131"/>
</scene>
<!--Navigation Controller-->
<scene sceneID="P5w-Qq-Qnr">
<objects>
<navigationController id="Wca-5m-4jx" sceneMemberID="viewController">
<navigationBar key="navigationBar" contentMode="scaleToFill" id="gc0-XE-nSj">
<rect key="frame" x="0.0" y="0.0" />
<autoresizingMask key="autoresizingMask"/>
</navigationBar>
<connections>
<segue destination="pdW-3L-D3v" kind="relationship" relationship="rootViewController" id="Cmi-b2-qJ7"/>
</connections>
</navigationController>
<placeholder placeholderIdentifier="IBFirstResponder" id="8Iw-y7-6CL" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="4654" y="-131"/>
</scene>
<!--View Controller-->
<scene sceneID="yLb-Gh-kwS">
<objects>
<viewController id="pdW-3L-D3v" customClass="ViewController" customModule="test" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="6r9-si-Z7k"/>
<viewControllerLayoutGuide type="bottom" id="gn1-Ij-96t"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="GHL-CQ-FOp">
<rect key="frame" x="0.0" y="0.0" />
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" red="1" green="0.40000000600000002" blue="0.40000000600000002" alpha="1" colorSpace="calibratedRGB"/>
</view>
<navigationItem key="navigationItem" id="xWV-p6-Kxr">
<barButtonItem key="rightBarButtonItem" title="Dismiss" id="YEp-mM-R0q">
<connections>
<action selector="dismissAction:" destination="pdW-3L-D3v" id="uIX-Ji-H2L"/>
</connections>
</barButtonItem>
</navigationItem>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="KGz-ra-8TI" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="5458" y="-131"/>
</scene>
</scenes>
</document>
【讨论】：
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