fix: rickytan#96 修复从下一级返回上一级时，如果上级没有设置 disable，会自动设置 disable 为 YES 的 bug，因为返回到上一级时，hasSetLeftItem 永远为 YES；

Author: rickytan

CHANGELOG.md

@@ -1,3 +1,7 @@
+0.6.2
+
+- fix #96
+
 0.6.1
 
 - fix `-preferredStatusBarStyle`

RTRootNavigationController.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'RTRootNavigationController'
-  s.version          = '0.6.1'
+  s.version          = '0.6.2'
   s.summary          = 'Transparently make every view controller has its own navigation bar'
   s.description      = <<-DESC
 More and more apps use custom navigation bar for each different view controller, instead of one common, gloabal navigation bar.

RTRootNavigationController/Classes/RTRootNavigationController.m

@@ -860,6 +860,9 @@ - (void)navigationController:(UINavigationController *)navigationController
         if (hasSetLeftItem && !viewController.rt_hasSetInteractivePop) {
             viewController.rt_disableInteractivePop = YES;
         }
+        else if (!viewController.rt_hasSetInteractivePop) {
+            viewController.rt_disableInteractivePop = NO;
+        }
         if (!self.useSystemBackBarButtonItem && !hasSetLeftItem) {
             if ([viewController respondsToSelector:@selector(rt_customBackItemWithTarget:action:)]) {
                 viewController.navigationItem.leftBarButtonItem = [viewController rt_customBackItemWithTarget:self