Add didSelectPublisher to UITabBar

CombineCommunity · KimTaeHyeong17 · Oct 21, 2021 · Oct 21, 2021 · 6269c2c7a47c7601531e85d03bcd2dae1d373636
commit 6269c2c7a47c7601531e85d03bcd2dae1d373636
diff --git a/Example/Example.xcodeproj/project.pbxproj b/Example/Example.xcodeproj/project.pbxproj
@@ -19,6 +19,7 @@
 		A24C440622F592E800BC2E2B /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = A24C440522F592E800BC2E2B /* Assets.xcassets */; };
 		A24C440922F592E800BC2E2B /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = A24C440722F592E800BC2E2B /* LaunchScreen.storyboard */; };
 		B9BC1EAD26BAE72B00AE95E5 /* UIScrollViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B9BC1EAC26BAE72B00AE95E5 /* UIScrollViewTests.swift */; };
+		CE1E41612721BE980033C23C /* UITabBarTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = CE1E41602721BE980033C23C /* UITabBarTests.swift */; };
 		DC8A555624B5ED4B007BCEEC /* UITableViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = DC8A555524B5ED4B007BCEEC /* UITableViewTests.swift */; };
 		DC8A555E24B60A9A007BCEEC /* UICollectionViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = DC8A555D24B60A9A007BCEEC /* UICollectionViewTests.swift */; };
 /* End PBXBuildFile section */
@@ -51,6 +52,7 @@
 		B84F6B1029BF235509B7F677 /* Pods-Example-ExampleTests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Example-ExampleTests.release.xcconfig"; path = "Target Support Files/Pods-Example-ExampleTests/Pods-Example-ExampleTests.release.xcconfig"; sourceTree = "<group>"; };
 		B9BC1EAC26BAE72B00AE95E5 /* UIScrollViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIScrollViewTests.swift; sourceTree = "<group>"; wrapsLines = 1; };
 		BE798B0656978A899BDE50BF /* Pods_Example_ExampleTests.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Example_ExampleTests.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		CE1E41602721BE980033C23C /* UITabBarTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UITabBarTests.swift; sourceTree = "<group>"; };
 		DC8A555324B5ED4B007BCEEC /* ExampleTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = ExampleTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		DC8A555524B5ED4B007BCEEC /* UITableViewTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UITableViewTests.swift; sourceTree = "<group>"; };
 		DC8A555724B5ED4B007BCEEC /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -144,6 +146,7 @@
 				7822AD1D24E1504600187502 /* UITextViewTests.swift */,
 				0AEC3D4D25260DC7007EE97C /* UISearchBarTests.swift */,
 				3F50DED225D6B4B700AC53A7 /* UIPageControlTests.swift */,
+				CE1E41602721BE980033C23C /* UITabBarTests.swift */,
 				DC8A555724B5ED4B007BCEEC /* Info.plist */,
 			);
 			path = ExampleTests;
@@ -349,6 +352,7 @@
 				7822AD1E24E1504600187502 /* UITextViewTests.swift in Sources */,
 				0AEC3D4E25260DC7007EE97C /* UISearchBarTests.swift in Sources */,
 				DC8A555E24B60A9A007BCEEC /* UICollectionViewTests.swift in Sources */,
+				CE1E41612721BE980033C23C /* UITabBarTests.swift in Sources */,
 				B9BC1EAD26BAE72B00AE95E5 /* UIScrollViewTests.swift in Sources */,
 				3F50DED325D6B4B700AC53A7 /* UIPageControlTests.swift in Sources */,
 				DC8A555624B5ED4B007BCEEC /* UITableViewTests.swift in Sources */,

diff --git a/Example/Example/ControlsViewController.swift b/Example/Example/ControlsViewController.swift
@@ -19,7 +19,8 @@ class ControlsViewController: UIViewController {
     @IBOutlet private var datePicker: UIDatePicker!
     @IBOutlet private var console: UITextView!
     @IBOutlet private var rightBarButtonItem: UIBarButtonItem!
-
+    @IBOutlet private var tabBar: UITabBar!
+
     private var subscriptions = Set<AnyCancellable>()
 
     override func viewDidLoad() {
@@ -50,6 +51,7 @@ class ControlsViewController: UIViewController {
             .merge(with: leftSwipe.swipePublisher.map { "Swiped Left with Gesture \($0.memoryAddress)" },
                    longPress.longPressPublisher.map { "Long Pressed with Gesture \($0.memoryAddress)" },
                    doubleTap.tapPublisher.map { "Double-tapped view with two fingers with Gesture \($0.memoryAddress)" },
+                   tabBar.didSelectPublisher.map { "tabBar selected title is \($0.title ?? "") and badge is \($0.badgeValue ?? "")"},
                    console.reachedBottomPublisher().map { _ in "Reached the bottom of the UITextView" })
             .scan("") { $0 + "\n" + $1 }
             .handleEvents(receiveOutput: { [console] text in

diff --git a/Example/Example/Main.storyboard b/Example/Example/Main.storyboard
@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14854.2" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="4Ib-BL-pNq">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="19162" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="4Ib-BL-pNq">
     <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14806.4"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="19144"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -53,7 +55,7 @@
                                     <stackView opaque="NO" contentMode="scaleToFill" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="P4e-Ie-0W8">
                                         <rect key="frame" x="0.0" y="119" width="382" height="31"/>
                                         <subviews>
-                                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="utR-GO-fQs" userLabel="Tap this button">
+                                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="utR-GO-fQs" userLabel="Tap this button">
                                                 <rect key="frame" x="0.0" y="0.0" width="325" height="31"/>
                                                 <state key="normal" title="Tap this button"/>
                                             </button>
@@ -68,24 +70,39 @@
                                 </subviews>
                             </stackView>
                             <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" text="Events:" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="CVe-Hd-do1" userLabel="Debug Text View">
-                                <rect key="frame" x="16" y="514" width="382" height="348"/>
-                                <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
-                                <color key="textColor" systemColor="labelColor" cocoaTouchSystemColor="darkTextColor"/>
+                                <rect key="frame" x="16" y="514" width="382" height="288"/>
+                                <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                                <color key="textColor" systemColor="labelColor"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                 <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
                             </textView>
+                            <tabBar contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="k0l-ab-jMZ">
+                                <rect key="frame" x="0.0" y="812" width="414" height="50"/>
+                                <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="50" id="uzX-ud-E4R"/>
+                                </constraints>
+                                <items>
+                                    <tabBarItem title="first tab" image="1.circle" catalog="system" badgeValue="1" id="NqF-BG-elX"/>
+                                    <tabBarItem title="second tab" image="2.circle" catalog="system" badgeValue="2" id="Dwd-8P-Jhm"/>
+                                    <tabBarItem title="third tab" image="3.circle" catalog="system" badgeValue="3" id="jZo-uA-PmX"/>
+                                </items>
+                            </tabBar>
                         </subviews>
-                        <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="PSG-wD-zhs"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                         <constraints>
+                            <constraint firstItem="k0l-ab-jMZ" firstAttribute="top" secondItem="CVe-Hd-do1" secondAttribute="bottom" constant="10" id="382-hP-BZc"/>
                             <constraint firstItem="PSG-wD-zhs" firstAttribute="trailing" secondItem="7by-4H-6wI" secondAttribute="trailing" constant="16" id="63g-lD-KyA"/>
                             <constraint firstItem="7by-4H-6wI" firstAttribute="top" secondItem="PSG-wD-zhs" secondAttribute="top" id="FQB-eU-nn2"/>
-                            <constraint firstItem="CVe-Hd-do1" firstAttribute="bottom" secondItem="PSG-wD-zhs" secondAttribute="bottom" id="Gib-yb-1r0"/>
                             <constraint firstItem="7by-4H-6wI" firstAttribute="leading" secondItem="PSG-wD-zhs" secondAttribute="leading" constant="16" id="ITW-9U-GzR"/>
                             <constraint firstItem="CVe-Hd-do1" firstAttribute="trailing" secondItem="tm0-m6-nJj" secondAttribute="trailing" id="QfS-va-pHA"/>
+                            <constraint firstItem="k0l-ab-jMZ" firstAttribute="leading" secondItem="PSG-wD-zhs" secondAttribute="leading" id="bcD-CH-ZCE"/>
                             <constraint firstItem="CVe-Hd-do1" firstAttribute="leading" secondItem="tm0-m6-nJj" secondAttribute="leading" id="iOA-eM-f8x"/>
+                            <constraint firstAttribute="trailing" secondItem="k0l-ab-jMZ" secondAttribute="trailing" id="lab-i5-lIe"/>
                             <constraint firstItem="CVe-Hd-do1" firstAttribute="top" secondItem="7by-4H-6wI" secondAttribute="bottom" id="tTk-F5-1v3"/>
+                            <constraint firstItem="k0l-ab-jMZ" firstAttribute="bottom" secondItem="PSG-wD-zhs" secondAttribute="bottom" id="vZX-sa-7c8"/>
                         </constraints>
-                        <viewLayoutGuide key="safeArea" id="PSG-wD-zhs"/>
                     </view>
                     <navigationItem key="navigationItem" title="CombineCocoa" largeTitleDisplayMode="always" id="Gpl-hh-ZcW">
                         <barButtonItem key="rightBarButtonItem" title="Tap Me!" id="bua-r4-BCr"/>
@@ -98,6 +115,7 @@
                         <outlet property="segmented" destination="Fjj-bk-JKz" id="Tv8-hI-TDa"/>
                         <outlet property="slider" destination="Cbi-R7-6Un" id="0ch-Ae-cSx"/>
                         <outlet property="switch" destination="C3j-RG-2yZ" id="d7g-oY-SUh"/>
+                        <outlet property="tabBar" destination="k0l-ab-jMZ" id="ARX-w8-w4U"/>
                         <outlet property="textField" destination="A4E-5S-bfr" id="KlI-N5-d6X"/>
                     </connections>
                 </viewController>
@@ -106,4 +124,15 @@
             <point key="canvasLocation" x="192.75362318840581" y="-4.0178571428571423"/>
         </scene>
     </scenes>
+    <resources>
+        <image name="1.circle" catalog="system" width="128" height="121"/>
+        <image name="2.circle" catalog="system" width="128" height="121"/>
+        <image name="3.circle" catalog="system" width="128" height="121"/>
+        <systemColor name="labelColor">
+            <color white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+    </resources>
 </document>
diff --git a/Example/ExampleTests/UITabBarTests.swift b/Example/ExampleTests/UITabBarTests.swift
@@ -0,0 +1,40 @@
+//
+//  UITabBarTests.swift
+//  ExampleTests
+//
+//  Created by TaeHyeongKim on 2021/10/22.
+//  Copyright © 2021 Shai Mishali. All rights reserved.
+//
+
+import XCTest
+import Combine
+@testable import CombineCocoa
+
+class UITabBarTests: XCTestCase {
+    var subscriptions = Set<AnyCancellable>()
+
+    override func tearDown() {
+        subscriptions = .init()
+    }
+
+    func test_didSelect() {
+        let tab1 = UITabBarItem(title: "testTab_1", image: nil, tag: 0)
+        let tab2 = UITabBarItem(title: "testTab_2", image: nil, tag: 1)
+        let tab3 = UITabBarItem(title: "testTab_3", image: nil, tag: 2)
+        let tabBar = UITabBar()
+        tabBar.items = [tab1, tab2, tab3]
+
+        var resultTabBarItem: UITabBarItem? = nil
+
+        tabBar.didSelectPublisher
+            .sink { resultTabBarItem = $0 }
+            .store(in: &subscriptions)
+
+        let givenTabBarItem = tab2
+        tabBar.delegate?.tabBar?(tabBar, didSelect: tab2)
+
+        XCTAssertEqual(resultTabBarItem, givenTabBarItem)
+    }
+
+
+}
diff --git a/Sources/CombineCocoa/Controls/UITabBar+Combine.swift b/Sources/CombineCocoa/Controls/UITabBar+Combine.swift
@@ -0,0 +1,36 @@
+//
+//  UITabBar+Combine.swift
+//  CombineCocoa
+//
+//  Created by TaeHyeongKim on 2021/10/21.
+//
+
+
+#if !(os(iOS) && (arch(i386) || arch(arm)))
+import Combine
+import UIKit
+
+@available(iOS 13.0, *)
+public extension UITabBar {
+
+    /// Combine wrapper for `tabBar(_:didSelect:)`
+    var didSelectPublisher: AnyPublisher<UITabBarItem, Never> {
+        let selector = #selector(UITabBarDelegate.tabBar(_:didSelect:))
+        return delegateProxy.interceptSelectorPublisher(selector)
+            .map { $0[1] as! UITabBarItem }
+            .eraseToAnyPublisher()
+    }
+
+    private var delegateProxy: UITabBarProxy {
+        .createDelegateProxy(for: self)
+    }
+
+}
+
+@available(iOS 13.0, *)
+private class UITabBarProxy: DelegateProxy, UITabBarDelegate, DelegateProxyType {
+    func setDelegate(to object: UITabBar) {
+        object.delegate = self
+    }
+}
+#endif