feat: Blur view extension, UIBarButtonItem tap publisher

Author: DominikPetho

GoodExtensions.xcodeproj/project.pbxproj

@@ -25,6 +25,8 @@
 		B18F13422677479E00F7FF17 /* UIRefreshControl.swift in Sources */ = {isa = PBXBuildFile; fileRef = B18F133F2677479E00F7FF17 /* UIRefreshControl.swift */; };
 		B18F13432677479E00F7FF17 /* UIScrollView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B18F13402677479E00F7FF17 /* UIScrollView.swift */; };
 		B1D953AD2673972700EE30CE /* GesturePublisher.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_16 /* GesturePublisher.swift */; };
+		BAF111E426D7B1AB00D16E9F /* UIBarButtonPublisher.swift in Sources */ = {isa = PBXBuildFile; fileRef = BAF111E326D7B1AB00D16E9F /* UIBarButtonPublisher.swift */; };
+		BAF111E626D7B1C200D16E9F /* UIBarButtonSubscriber.swift in Sources */ = {isa = PBXBuildFile; fileRef = BAF111E526D7B1C200D16E9F /* UIBarButtonSubscriber.swift */; };
 		OBJ_113 /* DemandBuffer.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_66 /* DemandBuffer.swift */; };
 		OBJ_114 /* Sink.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_67 /* Sink.swift */; };
 		OBJ_115 /* Optional.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_69 /* Optional.swift */; };
@@ -230,6 +232,8 @@
 		B18F133E2677479D00F7FF17 /* Date.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Date.swift; sourceTree = "<group>"; };
 		B18F133F2677479E00F7FF17 /* UIRefreshControl.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UIRefreshControl.swift; sourceTree = "<group>"; };
 		B18F13402677479E00F7FF17 /* UIScrollView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UIScrollView.swift; sourceTree = "<group>"; };
+		BAF111E326D7B1AB00D16E9F /* UIBarButtonPublisher.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIBarButtonPublisher.swift; sourceTree = "<group>"; };
+		BAF111E526D7B1C200D16E9F /* UIBarButtonSubscriber.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIBarButtonSubscriber.swift; sourceTree = "<group>"; };
 		"CombineExt::CombineExt::Product" /* CombineExt.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; path = CombineExt.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		"GoodExtensions::GRCompatible::Product" /* GRCompatible.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; path = GRCompatible.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		"GoodExtensions::GoodCache::Product" /* GoodCache.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; path = GoodCache.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -417,6 +421,8 @@
 				OBJ_19 /* Publishers.swift */,
 				OBJ_20 /* UIControlPublisher.swift */,
 				OBJ_21 /* UIControlSubscriber.swift */,
+				BAF111E326D7B1AB00D16E9F /* UIBarButtonPublisher.swift */,
+				BAF111E526D7B1C200D16E9F /* UIBarButtonSubscriber.swift */,
 			);
 			name = GoodCombineExtensions;
 			path = Sources/GoodCombineExtensions;
@@ -939,8 +945,10 @@
 			buildActionMask = 0;
 			files = (
 				OBJ_172 /* GestureSubscriber.swift in Sources */,
+				BAF111E626D7B1C200D16E9F /* UIBarButtonSubscriber.swift in Sources */,
 				OBJ_173 /* Nwise.swift in Sources */,
 				B1D953AD2673972700EE30CE /* GesturePublisher.swift in Sources */,
+				BAF111E426D7B1AB00D16E9F /* UIBarButtonPublisher.swift in Sources */,
 				OBJ_174 /* Publishers.swift in Sources */,
 				OBJ_175 /* UIControlPublisher.swift in Sources */,
 				OBJ_176 /* UIControlSubscriber.swift in Sources */,

Sources/GoodCombineExtensions/UIBarButtonPublisher.swift

@@ -0,0 +1,44 @@
+//
+//  UIBarButtonPublisher.swift
+//  GoodCombineExtensions
+//
+//  Created by GoodRequest on 26/08/2021.
+//
+
+#if !os(macOS)
+import UIKit
+import Combine
+import GRCompatible
+
+@available(iOS 13.0, *)
+public struct UIBarButtonPublisher<BarButtonItem: UIBarButtonItem>: Publisher {
+
+    public typealias Output = BarButtonItem
+    public typealias Failure = Never
+
+    weak var barButtonItem: BarButtonItem?
+
+    init(barButtonItem: BarButtonItem, event: UIControl.Event) {
+        self.barButtonItem = barButtonItem
+    }
+
+    public func receive<S>(subscriber: S) where S : Subscriber,
+                                         S.Failure == UIBarButtonPublisher.Failure,
+                                         S.Input == UIBarButtonPublisher.Output {
+        let subscription = UIBarButtonSubscription(
+            subscriber: subscriber,
+            barButtonItem: barButtonItem
+        )
+        subscriber.receive(subscription: subscription)
+    }
+}
+
+@available(iOS 13.0, *)
+public extension GRActive where Base: UIBarButtonItem {
+
+    func tapPublisher(for event: UIControl.Event) -> UIBarButtonPublisher<UIBarButtonItem> {
+        UIBarButtonPublisher(barButtonItem: base, event: event)
+    }
+
+}
+#endif

Sources/GoodCombineExtensions/UIBarButtonSubscriber.swift

@@ -0,0 +1,43 @@
+//
+//  UIBarButtonSubscriber.swift
+//  GoodCombineExtensions
+//
+//  Created by GoodRequest on 26/08/2021.
+//
+
+#if !os(macOS)
+import UIKit
+import Combine
+
+@available(iOS 13.0, *)
+final class UIBarButtonSubscription<SubscriberType: Subscriber, BarButtonItem: UIBarButtonItem>: Subscription where SubscriberType.Input == BarButtonItem {
+
+    private var subscriber: SubscriberType?
+    private weak var barButtonItem: BarButtonItem?
+
+    init(subscriber: SubscriberType, barButtonItem: BarButtonItem?) {
+        self.subscriber = subscriber
+        self.barButtonItem = barButtonItem
+
+        if let button = barButtonItem?.customView as? UIButton {
+            button.addTarget(self, action: #selector(eventHandler), for: .touchUpInside)
+        } else {
+            barButtonItem?.action = #selector(eventHandler)
+            barButtonItem?.target = self
+        }
+    }
+
+    public func request(_ demand: Subscribers.Demand) {
+
+    }
+
+    public func cancel() {
+        subscriber = nil
+    }
+
+    @objc private func eventHandler() {
+        guard let barButtonItem = barButtonItem else { return }
+        _ = subscriber?.receive(barButtonItem)
+    }
+}
+#endif

Sources/GoodExtensions/GoodSwift.swift

@@ -176,6 +176,10 @@ public extension GRActive where Base: UICollectionView {
 
     /// Register reusable cell with specified class type.
     func registerCell<T: UICollectionViewCell>(fromClass type: T.Type) {
+        guard Bundle.main.path(forResource: String(describing: type), ofType: "nib") != nil else {
+            base.register(T.self, forCellWithReuseIdentifier: String(describing: type))
+            return
+        }
         base.register(UINib(nibName: String(describing: type), bundle: nil), forCellWithReuseIdentifier: String(describing: type))
     }
 
@@ -222,6 +226,10 @@ public extension GRActive where Base: UITableView {
 
     /// Register reusable cell with specified class type.
     func registerCell<T: UITableViewCell>(fromClass type: T.Type) {
+        guard Bundle.main.path(forResource: String(describing: type), ofType: "nib") != nil else {
+            base.register(T.self, forCellReuseIdentifier: String(describing: type))
+            return
+        }
         base.register(UINib(nibName: String(describing: type), bundle: nil), forCellReuseIdentifier: String(describing: type))
     }
 

Sources/GoodExtensions/UIView.swift

@@ -102,4 +102,66 @@ public extension GRActive where Base: UIView {
 
 }
 
+// MARK: - Blur
+
+public extension GRActive where Base: UIView {
+
+    func blur(_ blurRadius: Double = 3.5) {
+        unblur()
+        guard let blurredImage = createBlurryImage(blurRadius) else {
+            return
+        }
+
+        let blurredImageView = UIImageView(image: blurredImage)
+        blurredImageView.translatesAutoresizingMaskIntoConstraints = false
+        blurredImageView.tag = -419
+        blurredImageView.contentMode = .center
+        blurredImageView.backgroundColor = .clear
+
+        base.addSubview(blurredImageView)
+        NSLayoutConstraint.activate([
+            blurredImageView.centerXAnchor.constraint(equalTo: base.centerXAnchor),
+            blurredImageView.centerYAnchor.constraint(equalTo: base.centerYAnchor)
+        ])
+    }
+
+    func unblur() {
+        base.subviews.forEach {
+            if $0.tag == -419 {
+                $0.removeFromSuperview()
+                base.layoutSubviews()
+            }
+        }
+    }
+
+    private func createBlurryImage(_ blurRadius: Double) -> UIImage? {
+        UIGraphicsBeginImageContext(base.bounds.size)
+        guard let currentContext = UIGraphicsGetCurrentContext() else {
+            return nil
+        }
+        base.layer.render(in: currentContext)
+        guard let image = UIGraphicsGetImageFromCurrentImageContext(),
+            let blurFilter = CIFilter(name: "CIGaussianBlur") else {
+            UIGraphicsEndImageContext()
+            return nil
+        }
+        UIGraphicsEndImageContext()
+
+        blurFilter.setDefaults()
+
+        blurFilter.setValue(CIImage(image: image), forKey: kCIInputImageKey)
+        blurFilter.setValue(blurRadius, forKey: kCIInputRadiusKey)
+
+        var convertedImage: UIImage?
+        let context = CIContext(options: nil)
+        if let blurOutputImage = blurFilter.outputImage,
+            let cgImage = context.createCGImage(blurOutputImage, from: blurOutputImage.extent) {
+            convertedImage = UIImage(cgImage: cgImage)
+        }
+
+        return convertedImage
+    }
+
+}
+
 #endif