Fix a bug when push to a view controller in "viewDidLoad".

JazysYu · Apr 27, 2016 · a8087a7 · a8087a7
1 parent b8793ef
commit a8087a7
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/JZNavigationExtension/UIViewController+JZExtension.m b/JZNavigationExtension/UIViewController+JZExtension.m
@@ -71,7 +71,14 @@ - (BOOL)jz_hasNavigationBarTintColorSetterBeenCalled {
 
 - (CGFloat)jz_navigationBarBackgroundAlpha {
     id _navigationBarBackgroundAlpha = objc_getAssociatedObject(self, _cmd);
-    return _navigationBarBackgroundAlpha ? [_navigationBarBackgroundAlpha jz_CGFloatValue] : self.navigationController.jz_navigationBarBackgroundAlpha;
+    if (_navigationBarBackgroundAlpha) {
+        return [_navigationBarBackgroundAlpha jz_CGFloatValue];
+    }
+    UINavigationController *navigationController = self.navigationController;
+    if (navigationController) {
+        return navigationController.jz_navigationBarBackgroundAlpha;
+    }
+    return 1.f;
 }
 
 - (UIColor *)jz_navigationBarTintColor {