I want to remove back-button which takes me to previous VC. Is solution in changing rootVC or?
I have LoginVC and HomeVC. If user successfully logs in, he shouldn't have an option to go back to login screen because it makes no sense.
LoginVC:
let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
let homeVC = (mainStoryboard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController)
self.navigationController?.pushViewController(homeVC , animated: true)
I think it is about changing rootVC, not this(as I found on Stackoverflow):
self.navigationItem.rightBarButtonItem.hidden = YES
Rather than mess around with swapping the app's .rootViewController, you can set the navigation controller's viewController stack:
let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
let homeVC = (mainStoryboard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController)
// instead of pushing to homeVC
//self.navigationController?.pushViewController(homeVC , animated: true)
// set homeVC as the only VC in the navigation stack
self.navigationController?.setViewControllers([homeVC], animated: true)
You can also use that when you allow your user to log-out (just replace homeVC with your startup VC).
Here is some simple example code:
class StartViewController: UIViewController {
// has a button in Storyboard to push to LogInViewController
}
class LogInViewController: UIViewController {
@IBAction func doLoginTapped(_ sender: Any) {
if let vc = storyboard?.instantiateViewController(withIdentifier: "HomeVC") as? HomeViewController {
self.navigationController?.setViewControllers([vc], animated: true)
}
}
}
class HomeViewController: UIViewController {
// has a button in Storyboard to push to LoggedInSecondViewController
@IBAction func doLogoutTapped(_ sender: Any) {
if let vc = storyboard?.instantiateViewController(withIdentifier: "StartVC") as? StartViewController {
self.navigationController?.setViewControllers([vc], animated: true)
}
}
}
class LoggedInSecondViewController: UIViewController {
}
and here is the Storyboard for that code:
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15505" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="EqK-Mj-3Vf">
<device id="retina4_7" orientation="portrait" appearance="light"/>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15510"/>
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--Log In View Controller-->
<scene sceneID="e5u-QJ-Bww">
<objects>
<viewController id="b3W-0i-Mlb" customClass="LogInViewController" customModule="scratchy" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="ncx-cU-8Af">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="OSX-B9-w8Z">
<rect key="frame" x="154.5" y="318.5" width="66" height="30"/>
<state key="normal" title="Do Log In"/>
<connections>
<action selector="doLoginTapped:" destination="b3W-0i-Mlb" eventType="touchUpInside" id="j1a-uJ-1IG"/>
</connections>
</button>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="This is LogIn VC" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="NsK-V0-VeG">
<rect key="frame" x="126" y="121" width="123" height="21"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<constraints>
<constraint firstItem="NsK-V0-VeG" firstAttribute="centerX" secondItem="ncx-cU-8Af" secondAttribute="centerX" id="QpB-r9-5qU"/>
<constraint firstItem="NsK-V0-VeG" firstAttribute="top" secondItem="EbT-Jq-J3U" secondAttribute="top" constant="77" id="ZKY-xE-pEb"/>
<constraint firstItem="OSX-B9-w8Z" firstAttribute="centerX" secondItem="ncx-cU-8Af" secondAttribute="centerX" id="fMq-4v-XyT"/>
<constraint firstItem="OSX-B9-w8Z" firstAttribute="centerY" secondItem="ncx-cU-8Af" secondAttribute="centerY" id="qVY-nC-PqE"/>
</constraints>
<viewLayoutGuide key="safeArea" id="EbT-Jq-J3U"/>
</view>
<navigationItem key="navigationItem" id="o8k-0O-cNJ"/>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="uP4-Vf-4SL" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="380" y="824"/>
</scene>
<!--Start View Controller-->
<scene sceneID="SdS-pG-Q2l">
<objects>
<viewController storyboardIdentifier="StartVC" id="cLV-i6-MSZ" customClass="StartViewController" customModule="scratchy" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="Dy4-oJ-DW4">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IP4-Qz-zns">
<rect key="frame" x="107" y="318.5" width="161" height="30"/>
<state key="normal" title="Push to go to Log In VC"/>
<connections>
<segue destination="b3W-0i-Mlb" kind="show" id="MFe-2F-dT0"/>
</connections>
</button>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="This is Start VC" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="IFb-C0-mX9">
<rect key="frame" x="128.5" y="133" width="118" height="21"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<constraints>
<constraint firstItem="IP4-Qz-zns" firstAttribute="centerX" secondItem="Dy4-oJ-DW4" secondAttribute="centerX" id="0df-jh-VtW"/>
<constraint firstItem="IFb-C0-mX9" firstAttribute="top" secondItem="FgR-v5-onA" secondAttribute="top" constant="89" id="0wq-KY-OwB"/>
<constraint firstItem="IFb-C0-mX9" firstAttribute="centerX" secondItem="Dy4-oJ-DW4" secondAttribute="centerX" id="AbM-cV-Fih"/>
<constraint firstItem="IP4-Qz-zns" firstAttribute="centerY" secondItem="Dy4-oJ-DW4" secondAttribute="centerY" id="OZz-KS-otd"/>
</constraints>
<viewLayoutGuide key="safeArea" id="FgR-v5-onA"/>
</view>
<navigationItem key="navigationItem" id="FZs-4c-uJy"/>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="ZsD-zq-DWe" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="-423" y="825"/>
</scene>
<!--Navigation Controller-->
<scene sceneID="eYF-Ds-vCn">
<objects>
<navigationController automaticallyAdjustsScrollViewInsets="NO" id="EqK-Mj-3Vf" sceneMemberID="viewController">
<toolbarItems/>
<navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="fyf-nl-MqT">
<rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
<autoresizingMask key="autoresizingMask"/>
</navigationBar>
<nil name="viewControllers"/>
<connections>
<segue destination="cLV-i6-MSZ" kind="relationship" relationship="rootViewController" id="4nw-Xk-KCB"/>
</connections>
</navigationController>
<placeholder placeholderIdentifier="IBFirstResponder" id="QOw-4S-yYe" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="-1188" y="825"/>
</scene>
<!--Logged In Second View Controller-->
<scene sceneID="vaS-nn-D30">
<objects>
<viewController id="cgP-NN-DdJ" customClass="LoggedInSecondViewController" customModule="scratchy" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="phV-Lb-f4V">
<rect key="frame" x="0.0" y="0.0" width="375" height="647"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="This is Second Logged-In VC" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="plS-RQ-TJc">
<rect key="frame" x="76.5" y="313" width="222.5" height="21"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<constraints>
<constraint firstItem="plS-RQ-TJc" firstAttribute="centerY" secondItem="phV-Lb-f4V" secondAttribute="centerY" id="1l4-Gm-4xX"/>
<constraint firstItem="plS-RQ-TJc" firstAttribute="centerX" secondItem="phV-Lb-f4V" secondAttribute="centerX" id="lgM-6G-ddH"/>
</constraints>
<viewLayoutGuide key="safeArea" id="I3a-uq-iVv"/>
</view>
<navigationItem key="navigationItem" id="ZiS-qO-6ai"/>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="2aj-tp-f02" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="380" y="1493"/>
</scene>
<!--Home View Controller-->
<scene sceneID="aDs-4i-uOT">
<objects>
<viewController storyboardIdentifier="HomeVC" id="2Sw-P5-7xX" customClass="HomeViewController" customModule="scratchy" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="GGR-T3-B1f">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="This is Home VC" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="9r1-tN-d64">
<rect key="frame" x="124.5" y="323" width="126" height="21"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IgB-1W-AgB">
<rect key="frame" x="133.5" y="126" width="108" height="30"/>
<state key="normal" title="Push to Second"/>
<connections>
<segue destination="cgP-NN-DdJ" kind="show" id="xQa-nT-FSl"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="VXN-mx-1xi">
<rect key="frame" x="148.5" y="206" width="78" height="30"/>
<state key="normal" title="Do Log Out"/>
<connections>
<action selector="doLogoutTapped:" destination="2Sw-P5-7xX" eventType="touchUpInside" id="QER-XU-zLa"/>
</connections>
</button>
</subviews>
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<constraints>
<constraint firstItem="IgB-1W-AgB" firstAttribute="centerX" secondItem="GGR-T3-B1f" secondAttribute="centerX" id="Nel-cp-Vpn"/>
<constraint firstItem="9r1-tN-d64" firstAttribute="centerY" secondItem="GGR-T3-B1f" secondAttribute="centerY" id="XHH-fK-URc"/>
<constraint firstItem="VXN-mx-1xi" firstAttribute="top" secondItem="IgB-1W-AgB" secondAttribute="bottom" constant="50" id="eun-AA-w1O"/>
<constraint firstItem="9r1-tN-d64" firstAttribute="centerX" secondItem="GGR-T3-B1f" secondAttribute="centerX" id="n35-L7-XkI"/>
<constraint firstItem="VXN-mx-1xi" firstAttribute="centerX" secondItem="GGR-T3-B1f" secondAttribute="centerX" id="p2K-Ol-BjT"/>
<constraint firstItem="IgB-1W-AgB" firstAttribute="top" secondItem="r8E-HZ-gYH" secondAttribute="top" constant="126" id="z1y-oX-tvc"/>
</constraints>
<viewLayoutGuide key="safeArea" id="r8E-HZ-gYH"/>
</view>
<navigationItem key="navigationItem" id="EUX-Nq-hb0"/>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="nmk-R4-zEt" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="-423" y="1493"/>
</scene>
</scenes>
</document>