[url_launcher] migrating objc plugin to swift (#4753)

This PR converts the iOS portion of the url_launcher plugin from objc to swift. 

*List which issues are fixed by this PR. You must list at least one issue.*
flutter/flutter#119102

packages/url_launcher/url_launcher_ios/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 6.2.1
+
+* Migrates plugin from Objective-C to Swift.
+
 ## 6.2.0
 
 * Implements `supportsMode` and `supportsCloseForMode`.

packages/url_launcher/url_launcher_ios/example/ios/Runner.xcodeproj/project.pbxproj

@@ -269,7 +269,7 @@
 		97C146E61CF9000F007C117D /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1300;
+				LastUpgradeCheck = 1430;
 				ORGANIZATIONNAME = "The Flutter Authors";
 				TargetAttributes = {
 					97C146ED1CF9000F007C117D = {
@@ -631,6 +631,7 @@
 			baseConfigurationReference = 666BCD7C181C34F8BE58929B /* Pods-RunnerTests.debug.xcconfig */;
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = RunnerTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
@@ -651,6 +652,7 @@
 			baseConfigurationReference = D25C434271ACF6555E002440 /* Pods-RunnerTests.release.xcconfig */;
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				INFOPLIST_FILE = RunnerTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (

packages/url_launcher/url_launcher_ios/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1300"
+   LastUpgradeVersion = "1430"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

packages/url_launcher/url_launcher_ios/example/ios/RunnerTests/URLLauncherTests.swift

@@ -7,59 +7,52 @@ import XCTest
 
 @testable import url_launcher_ios
 
+// Tests whether NSURL parsing is strict. When linking against the iOS 17 SDK or later,
+// NSURL uses a more lenient parser which will not return nil.
+private func urlParsingIsStrict() -> Bool {
+  return URL(string: "b a d U R L") == nil
+}
+
 final class URLLauncherTests: XCTestCase {
 
-  private func createPlugin() -> FLTURLLauncherPlugin {
+  private func createPlugin() -> URLLauncherPlugin {
     let launcher = FakeLauncher()
-    return FLTURLLauncherPlugin(launcher: launcher)
+    return URLLauncherPlugin(launcher: launcher)
   }
 
-  private func createPlugin(launcher: FakeLauncher) -> FLTURLLauncherPlugin {
-    FLTURLLauncherPlugin(launcher: launcher)
+  private func createPlugin(launcher: FakeLauncher) -> URLLauncherPlugin {
+    return URLLauncherPlugin(launcher: launcher)
   }
 
   func testCanLaunchSuccess() {
-    var error: FlutterError?
-    let result = createPlugin().canLaunchURL("good://url", error: &error)
-
-    XCTAssertNotNil(result)
-    XCTAssertTrue(result?.boolValue ?? false)
-    XCTAssertNil(error)
+    let result = createPlugin().canLaunchUrl(url: "good://url")
+    XCTAssertEqual(result, .success)
   }
 
   func testCanLaunchFailure() {
-    var error: FlutterError?
-    let result = createPlugin().canLaunchURL("bad://url", error: &error)
-
-    XCTAssertNotNil(result)
-    XCTAssertFalse(result?.boolValue ?? true)
+    let result = createPlugin().canLaunchUrl(url: "bad://url")
+    XCTAssertEqual(result, .failure)
   }
 
   func testCanLaunchFailureWithInvalidURL() {
-    var error: FlutterError?
-    let result = createPlugin().canLaunchURL("urls can't have spaces", error: &error)
-
-    if (error == nil) {
-      // When linking against the iOS 17 SDK or later, NSURL uses a lenient parser, and won't
-      // fail to parse URLs, so the test must allow for either outcome.
-      XCTAssertNotNil(result)
-      XCTAssertFalse(result?.boolValue ?? true)
-      XCTAssertNil(error)
+    let result = createPlugin().canLaunchUrl(url: "urls can't have spaces")
+
+    if urlParsingIsStrict() {
+      XCTAssertEqual(result, .invalidUrl)
     } else {
-      XCTAssertNil(result)
-      XCTAssertNotNil(error)
-      XCTAssertEqual(error?.code, "argument_error")
-      XCTAssertEqual(error?.message, "Unable to parse URL")
-      XCTAssertEqual(error?.details as? String, "Provided URL: urls can't have spaces")
+      XCTAssertEqual(result, .failure)
     }
   }
 
   func testLaunchSuccess() {
     let expectation = XCTestExpectation(description: "completion called")
-    createPlugin().launchURL("good://url", universalLinksOnly: false) { result, error in
-      XCTAssertNotNil(result)
-      XCTAssertTrue(result?.boolValue ?? false)
-      XCTAssertNil(error)
+    createPlugin().launchUrl(url: "good://url", universalLinksOnly: false) { result in
+      switch result {
+      case .success(let details):
+        XCTAssertEqual(details, .success)
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
+      }
       expectation.fulfill()
     }
 
@@ -68,11 +61,13 @@ final class URLLauncherTests: XCTestCase {
 
   func testLaunchFailure() {
     let expectation = XCTestExpectation(description: "completion called")
-
-    createPlugin().launchURL("bad://url", universalLinksOnly: false) { result, error in
-      XCTAssertNotNil(result)
-      XCTAssertFalse(result?.boolValue ?? true)
-      XCTAssertNil(error)
+    createPlugin().launchUrl(url: "bad://url", universalLinksOnly: false) { result in
+      switch result {
+      case .success(let details):
+        XCTAssertEqual(details, .failure)
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
+      }
       expectation.fulfill()
     }
 
@@ -81,22 +76,17 @@ final class URLLauncherTests: XCTestCase {
 
   func testLaunchFailureWithInvalidURL() {
     let expectation = XCTestExpectation(description: "completion called")
-
-    createPlugin().launchURL("urls can't have spaces", universalLinksOnly: false) { result, error in
-      if (error == nil) {
-        // When linking against the iOS 17 SDK or later, NSURL uses a lenient parser, and won't
-        // fail to parse URLs, so the test must allow for either outcome.
-        XCTAssertNotNil(result)
-        XCTAssertFalse(result?.boolValue ?? true)
-        XCTAssertNil(error)
-      } else {
-        XCTAssertNil(result)
-        XCTAssertNotNil(error)
-        XCTAssertEqual(error?.code, "argument_error")
-        XCTAssertEqual(error?.message, "Unable to parse URL")
-        XCTAssertEqual(error?.details as? String, "Provided URL: urls can't have spaces")
+    createPlugin().launchUrl(url: "urls can't have spaces", universalLinksOnly: false) { result in
+      switch result {
+      case .success(let details):
+        if urlParsingIsStrict() {
+          XCTAssertEqual(details, .invalidUrl)
+        } else {
+          XCTAssertEqual(details, .failure)
+        }
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
       }
-
       expectation.fulfill()
     }
 
@@ -108,13 +98,17 @@ final class URLLauncherTests: XCTestCase {
     let plugin = createPlugin(launcher: launcher)
 
     let expectation = XCTestExpectation(description: "completion called")
-    plugin.launchURL("good://url", universalLinksOnly: false) { result, error in
-      XCTAssertNil(error)
+    plugin.launchUrl(url: "good://url", universalLinksOnly: false) { result in
+      switch result {
+      case .success(let details):
+        XCTAssertEqual(details, .success)
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
+      }
       expectation.fulfill()
     }
 
     wait(for: [expectation], timeout: 1)
-
     XCTAssertEqual(launcher.passedOptions?[.universalLinksOnly] as? Bool, false)
   }
 
@@ -123,31 +117,35 @@ final class URLLauncherTests: XCTestCase {
     let plugin = createPlugin(launcher: launcher)
 
     let expectation = XCTestExpectation(description: "completion called")
-
-    plugin.launchURL("good://url", universalLinksOnly: true) { result, error in
-      XCTAssertNil(error)
+    plugin.launchUrl(url: "good://url", universalLinksOnly: true) { result in
+      switch result {
+      case .success(let details):
+        XCTAssertEqual(details, .success)
+      case .failure(let error):
+        XCTFail("Unexpected error: \(error)")
+      }
       expectation.fulfill()
     }
 
     wait(for: [expectation], timeout: 1)
-
     XCTAssertEqual(launcher.passedOptions?[.universalLinksOnly] as? Bool, true)
   }
 
 }
 
-final private class FakeLauncher: NSObject, FULLauncher {
+final private class FakeLauncher: NSObject, Launcher {
   var passedOptions: [UIApplication.OpenExternalURLOptionsKey: Any]?
 
-  func canOpen(_ url: URL) -> Bool {
-    return url.scheme == "good"
+  func canOpenURL(_ url: URL) -> Bool {
+    url.scheme == "good"
   }
 
   func open(
-    _ url: URL, options: [UIApplication.OpenExternalURLOptionsKey: Any] = [:],
-    completionHandler: ((Bool) -> Void)? = nil
+    _ url: URL,
+    options: [UIApplication.OpenExternalURLOptionsKey: Any],
+    completionHandler completion: ((Bool) -> Void)?
   ) {
     self.passedOptions = options
-    completionHandler?(url.scheme == "good")
+    completion?(url.scheme == "good")
   }
 }