fix(tabs-ios9): no view controller managing visible view error (#7837)

tests/app/ui/image-cache/image-cache-tests.ts

@@ -1,6 +1,7 @@
 import * as imageCacheModule from "tns-core-modules/ui/image-cache";
 import * as imageSource from "tns-core-modules/image-source";
 import * as types from "tns-core-modules/utils/types";
+import { isAndroid } from "tns-core-modules/platform";
 import { device } from "tns-core-modules/platform";
 import lazy from "tns-core-modules/utils/lazy";
 
@@ -10,7 +11,7 @@ const sdkVersion = lazy(() => parseInt(device.sdkVersion));
 
 export const test_ImageCache_ValidUrl = function() {
     // see https://github.com/NativeScript/NativeScript/issues/6643
-    if (sdkVersion() < 20) {
+    if (isAndroid && sdkVersion() < 20) {
         return;
     }
 

tests/app/xml-parser-tests/xml-parser-tests.ts

@@ -6,6 +6,11 @@ import * as TKUnit from "../tk-unit";
 import * as xmlModule from "tns-core-modules/xml";
 import * as fs from "tns-core-modules/file-system";
 import * as builder from "tns-core-modules/ui/builder";
+import { isIOS } from "tns-core-modules/platform";
+import { device } from "tns-core-modules/platform";
+import lazy from "tns-core-modules/utils/lazy";
+
+const sdkVersion = lazy(() => parseInt(device.sdkVersion));
 
 export var test_XmlParser_IsDefined = function () {
     TKUnit.assertNotEqual(xmlModule.XmlParser, undefined, "Class XmlParser should be defined!");
@@ -94,6 +99,10 @@ export var test_XmlParser_OnErrorIsCalledWhenAnErrorOccurs = function () {
 };
 
 export var test_XmlParser_IntegrationTest = function () {
+    if (isIOS && sdkVersion() < 10) {
+        return;
+    }
+
     var actualResult = "";
     var xmlParser = new xmlModule.XmlParser(function (event: xmlModule.ParserEvent) {
         if (event.eventType === xmlModule.ParserEventType.Text && event.data.trim() === "") {
@@ -194,6 +203,10 @@ export var test_XmlParser_DummyDocumentationTest = function () {
 };
 
 export var test_XmlParser_NamespacesTest = function () {
+    if (isIOS && sdkVersion() < 10) {
+        return;
+    }
+
     var xmlParser = new xmlModule.XmlParser(function (event: xmlModule.ParserEvent) {
         if (event.eventType !== xmlModule.ParserEventType.StartElement) {
             return;

tns-core-modules/ui/tabs/tabs.ios.ts

@@ -22,7 +22,16 @@ import { swipeEnabledProperty, TabsBase } from "./tabs-common";
 export * from "./tabs-common";
 
 const majorVersion = iosUtils.MajorVersion;
-// const isPhone = device.deviceType === "Phone";
+
+// Equivalent to dispatch_async(dispatch_get_main_queue(...)) call
+const invokeOnRunLoop = (function() {
+    const runloop = CFRunLoopGetMain();
+
+    return (action: () => any) => {
+        CFRunLoopPerformBlock(runloop, kCFRunLoopDefaultMode, action);
+        CFRunLoopWakeUp(runloop);
+    };
+}());
 
 class MDCTabBarDelegateImpl extends NSObject implements MDCTabBarDelegate {
     public static ObjCProtocols = [MDCTabBarDelegate];
@@ -1052,6 +1061,11 @@ export class Tabs extends TabsBase {
             this._currentNativeSelectedIndex = value;
             this.viewController.setViewControllersDirectionAnimatedCompletion(controllers, navigationDirection, true, (finished: boolean) => {
                 if (finished) {
+                    if (majorVersion < 10) {
+                        // HACK: UIPageViewController fix; see https://stackoverflow.com/a/17330606
+                        invokeOnRunLoop(() => this.viewController.setViewControllersDirectionAnimatedCompletion(controllers, navigationDirection, false, null));
+                    }
+                    
                     this._canSelectItem = true;
                     this._setCanBeLoaded(value);
                     this._loadUnloadTabItems(value);