MFMailComposeViewController Support

Xcode/Closures.xcodeproj/project.pbxproj

@@ -27,6 +27,7 @@
 		3FB77F311EE4DB5200C60F5C /* UITableViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FB77F301EE4DB5200C60F5C /* UITableViewTests.swift */; };
 		3FD393C61F9E583900DA155D /* UIBarButtonItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FD393C51F9E583900DA155D /* UIBarButtonItem.swift */; };
 		3FD393C81F9E61A900DA155D /* UIBarButtonItemTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FD393C71F9E61A900DA155D /* UIBarButtonItemTests.swift */; };
+		CC095542241EA9C0000125E1 /* MFMailComposeViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC095541241EA9C0000125E1 /* MFMailComposeViewController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -63,6 +64,7 @@
 		3FB77F301EE4DB5200C60F5C /* UITableViewTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UITableViewTests.swift; sourceTree = "<group>"; };
 		3FD393C51F9E583900DA155D /* UIBarButtonItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIBarButtonItem.swift; sourceTree = "<group>"; };
 		3FD393C71F9E61A900DA155D /* UIBarButtonItemTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIBarButtonItemTests.swift; sourceTree = "<group>"; };
+		CC095541241EA9C0000125E1 /* MFMailComposeViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MFMailComposeViewController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -89,6 +91,7 @@
 			children = (
 				3F59C5681F1C32AA00945666 /* Core.swift */,
 				3F59C5691F1C32AA00945666 /* KVO.swift */,
+				CC095541241EA9C0000125E1 /* MFMailComposeViewController.swift */,
 				3F59C56A1F1C32AA00945666 /* UICollectionView.swift */,
 				3F59C56B1F1C32AA00945666 /* UIControl.swift */,
 				3F59C56C1F1C32AA00945666 /* UIGestureRecognizer.swift */,
@@ -258,6 +261,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CC095542241EA9C0000125E1 /* MFMailComposeViewController.swift in Sources */,
 				3F59C5731F1C32BF00945666 /* UICollectionView.swift in Sources */,
 				3F59C5741F1C32BF00945666 /* UIControl.swift in Sources */,
 				3F59C5721F1C32BF00945666 /* KVO.swift in Sources */,

Xcode/Closures/Source/MFMailComposeViewController.swift

@@ -0,0 +1,87 @@
+//
+//  MFMailComposeViewController.swift
+//  
+//
+//  Created by Alex Ivashko on 15.03.2020.
+//
+
+import MessageUI
+
+@available(iOS 9.0, *)
+class MailComposeDelegate: NSObject, MFMailComposeViewControllerDelegate, DelegateProtocol {
+    fileprivate static var delegates = Set<DelegateWrapper<MFMailComposeViewController, MailComposeDelegate>>()
+
+    fileprivate var didFinishWith: ((_ result: MFMailComposeResult, _ error: Error?) -> Void)?
+    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
+        didFinishWith?(result, error)
+    }
+
+    override func responds(to aSelector: Selector!) -> Bool {
+        switch aSelector {
+        case #selector(MailComposeDelegate.mailComposeController(_:didFinishWith:error:)):
+            return didFinishWith != nil
+        default:
+            return super.responds(to: aSelector)
+        }
+    }
+}
+
+@available(iOS 9.0, *)
+extension MFMailComposeViewController {
+    public convenience init?(subject: String? = nil,
+                            toRecipients: [String]? = nil,
+                            ccRecipients: [String]? = nil,
+                            bccRecipients: [String]? = nil,
+                            body: (body: String, isHTML: Bool)? = nil,
+                            attachment: (data: Data, mimeType: String, fileName: String)? = nil,
+                            handler: @escaping ((_ result: MFMailComposeResult, _ error: Error?) -> Void)) {
+        guard MFMailComposeViewController.canSendMail() else {
+            return nil
+        }
+        self.init()
+        if let subject = subject {
+            setSubject(subject)
+        }
+        setToRecipients(toRecipients)
+        setCcRecipients(ccRecipients)
+        setBccRecipients(bccRecipients)
+        if let body = body {
+            setMessageBody(body.body, isHTML: body.isHTML)
+        }
+        if let attachment = attachment {
+            addAttachmentData(attachment.data, mimeType: attachment.mimeType, fileName: attachment.fileName)
+        }
+        didFinish(handler: handler)
+    }
+
+    @discardableResult
+    public func didFinish(handler: @escaping (_ result: MFMailComposeResult, _ error: Error?) -> Void) -> Self {
+        update { $0.didFinishWith = handler }
+    }
+}
+
+@available(iOS 9.0, *)
+extension MFMailComposeViewController: DelegatorProtocol {
+    @discardableResult
+    @objc func update(handler: (_ delegate: MailComposeDelegate) -> Void) -> Self {
+        DelegateWrapper.update(
+            self,
+            delegate: MailComposeDelegate(),
+            delegates: &MailComposeDelegate.delegates,
+            bind: MFMailComposeViewController.bind
+        ) {
+            handler($0.delegate)
+        }
+        return self
+    }
+
+    public func clearClosureDelegates() {
+        DelegateWrapper.remove(delegator: self, from: &MailComposeDelegate.delegates)
+        MFMailComposeViewController.bind(self, nil)
+    }
+
+    fileprivate static func bind(_ delegator: MFMailComposeViewController, _ delegate: MailComposeDelegate?) {
+        delegator.mailComposeDelegate = nil
+        delegator.mailComposeDelegate = delegate
+    }
+}

Xcode/ClosuresTests/UITableViewTests.swift

@@ -305,7 +305,7 @@ class UITableViewTests: XCTestCase {
     func testTableViewMethodExpectations() {
         let lastKnownDelegateCount: Int
         if #available(iOS 13, *) {
-            lastKnownDelegateCount = 49
+            lastKnownDelegateCount = 48
         } else {
             lastKnownDelegateCount = 41
         }