add new API shouldSelectPlusChildViewController

Author: ChenYilong

CYLTabBarController/CYLPlusButton.h

@@ -54,6 +54,8 @@
  */
 + (UIViewController *)plusChildViewController;
 
++ (BOOL)shouldSelectPlusChildViewController;
+
 #pragma mark - Deprecated API
 
 + (CGFloat)multiplerInCenterY CYL_DEPRECATED("Deprecated in 1.6.0. Use `+multiplierOfTabBarHeight:` instead.");

CYLTabBarController/CYLPlusButton.m

@@ -45,6 +45,13 @@ + (void)registerSubclass {
 #pragma clang diagnostic pop
 
 - (void)plusChildViewControllerButtonClicked:(UIButton<CYLPlusButtonSubclassing> *)sender {
+    BOOL notNeedConfigureSelectionStatus = [[self class] respondsToSelector:@selector(shouldSelectPlusChildViewController)] && ![[self class] shouldSelectPlusChildViewController];
+    if (notNeedConfigureSelectionStatus) {
+        return;
+    }
+    if (sender.selected) {
+        return;
+    }
     sender.selected = YES;
     [self cyl_tabBarController].selectedIndex = CYLPlusButtonIndex;
 }

CYLTabBarController/CYLTabBarController.m

@@ -268,14 +268,17 @@ - (void)offsetTabBarSwappableImageViewToFit:(CGFloat)swappableImageViewDefaultOf
 
 #pragma mark - delegate
 
-- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController*)viewController {
+- (void)updateSelectionStatusIfNeededForTabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
     NSUInteger selectedIndex = tabBarController.selectedIndex;
     UIButton *plusButton = CYLExternPlusButton;
-    if (CYLPlusChildViewController) {
-        if ((selectedIndex == CYLPlusButtonIndex) && (viewController != CYLPlusChildViewController)) {
-            plusButton.selected = NO;
-        }
+    BOOL shouldConfigureSelectionStatus = CYLPlusChildViewController && ((selectedIndex == CYLPlusButtonIndex) && (viewController != CYLPlusChildViewController));
+    if (shouldConfigureSelectionStatus) {
+        plusButton.selected = NO;
     }
+}
+
+- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
+    [[self cyl_tabBarController] updateSelectionStatusIfNeededForTabBarController:tabBarController shouldSelectViewController:viewController];
     return YES;
 }
 

CYLTabBarController/UIViewController+CYLTabBarControllerExtention.m

@@ -66,8 +66,10 @@ - (void)checkTabBarChildControllerValidityAtIndex:(NSUInteger)index {
     @try {
         UIViewController *viewController;
         viewController = tabBarController.viewControllers[index];
-        if (index != tabBarController.selectedIndex) {
-            CYLExternPlusButton.selected = NO;
+        UIButton *plusButton = CYLExternPlusButton;
+        BOOL shouldConfigureSelectionStatus = (CYLPlusChildViewController) && ((index != CYLPlusButtonIndex) && (viewController != CYLPlusChildViewController));
+        if (shouldConfigureSelectionStatus) {
+            plusButton.selected = NO;
         }
     } @catch (NSException *exception) {
         NSString *formatString = @"\n\n\

Example/Classes/View/CYLPlusButtonSubclass.m

@@ -140,11 +140,20 @@ - (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSIn
 //                                                   initWithRootViewController:plusChildViewController];
 //    return plusChildNavigationController;
 //}
-
-
+//
 //+ (NSUInteger)indexOfPlusButtonInTabBar {
 //    return 4;
 //}
+//
+//+ (BOOL)shouldSelectPlusChildViewController {
+//    BOOL isSelected = CYLExternPlusButton.selected;
+//    if (isSelected) {
+//        NSLog(@"🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is selected");
+//    } else {
+//        NSLog(@"🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is not selected");
+//    }
+//    return YES;
+//}
 
 + (CGFloat)multiplierOfTabBarHeight:(CGFloat)tabBarHeight {
     return  0.3;