[platform_view]use cmd to uninstall the app (#111139)

dev/devicelab/bin/tasks/native_platform_view_ui_tests_ios.dart

@@ -15,6 +15,17 @@ Future<void> main() async {
     final String projectDirectory = '${flutterDirectory.path}/dev/integration_tests/ios_platform_view_tests';
 
     await inDirectory(projectDirectory, () async {
+
+      // To address "Failed to terminate" failure.
+      section('Uninstall previously installed app');
+
+      await flutter(
+        'install',
+        options: <String>[
+          '--uninstall-only',
+        ],
+      );
+
       section('Build clean');
 
       await flutter('clean');

dev/integration_tests/ios_platform_view_tests/ios/PlatformViewUITests/PlatformViewUITests.m

@@ -26,45 +26,6 @@ static const CGFloat kStandardTimeOut = 60.0;
   [super setUp];
   self.continueAfterFailure = NO;
 
-  // Delete the previously installed app if needed before running.
-  // This is to address "Failed to terminate" failure.
-  // The solution is based on https://stackoverflow.com/questions/50016018/uitest-failed-to-terminate-com-test-abc3708-after-60-0s-state-is-still-runnin
-  XCUIApplication *springboard = [[XCUIApplication alloc] initWithBundleIdentifier:@"com.apple.springboard"];
-  [springboard activate];
-  XCUIElement *appIcon = springboard.icons[@"ios_platform_view_tests"];
-
-  if ([appIcon waitForExistenceWithTimeout:kStandardTimeOut]) {
-    NSLog(@"Deleting previously installed app.");
-
-    // It's possible that app icon is not hittable yet.
-    NSPredicate *hittable = [NSPredicate predicateWithFormat:@"exists == YES AND hittable == YES"];
-    [self expectationForPredicate:hittable evaluatedWithObject:appIcon handler:nil];
-    [self waitForExpectationsWithTimeout:kStandardTimeOut handler:nil];
-
-    // Pressing for 2 seconds will bring up context menu.
-    // Pressing for 3 seconds will dismiss the context menu and make icons wiggle.
-    [appIcon pressForDuration:2];
-
-    // The "Remove App" button in context menu.
-    XCUIElement *contextMenuRemoveButton = springboard.buttons[@"Remove App"];
-    XCTAssert([contextMenuRemoveButton waitForExistenceWithTimeout:kStandardTimeOut], @"The context menu remove app button must appear.");
-    [contextMenuRemoveButton tap];
-
-    // Tap the delete confirmation
-    XCUIElement *deleteConfirmationButton = springboard.alerts.buttons[@"Delete App"];
-    XCTAssert([deleteConfirmationButton waitForExistenceWithTimeout:kStandardTimeOut], @"The first delete confirmation button must appear.");
-    [deleteConfirmationButton tap];
-
-    // Tap the second delete confirmation
-    XCUIElement *secondDeleteConfirmationButton = springboard.alerts.buttons[@"Delete"];
-    XCTAssert([secondDeleteConfirmationButton waitForExistenceWithTimeout:kStandardTimeOut], @"The second delete confirmation button must appear.");
-    [secondDeleteConfirmationButton tap];
-
-    [NSThread sleepForTimeInterval:3];
-  } else {
-    NSLog(@"No previously installed app found.");
-  }
-
   self.app = [[XCUIApplication alloc] init];
   [self.app launch];
 }