diff --git a/JMActionSheetDescription.podspec b/JMActionSheetDescription.podspec
index f18ec31..7968dec 100644
--- a/JMActionSheetDescription.podspec
+++ b/JMActionSheetDescription.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "JMActionSheetDescription"
-  s.version          = "0.5.1"
+  s.version          = "0.5.2"
   s.summary          = "JMActionSheetDescription replace UIActionSheet and UIActivityViewController."
   s.description      = <<-DESC
                        JMActionSheetDescription is a descriptor component. It replace your ActionSheet and UIActivityViewController usage. Write your actionSheet description and let the framework generate your custom action representation. (Support iOS9 SplitView !)
diff --git a/Pod/Classes/JMActionSheet.m b/Pod/Classes/JMActionSheet.m
index c4d1a8e..1b6219d 100644
--- a/Pod/Classes/JMActionSheet.m
+++ b/Pod/Classes/JMActionSheet.m
@@ -39,7 +39,7 @@ @implementation JMActionSheet
 
 + (void)showActionSheetDescription:(JMActionSheetDescription *)actionSheetDescription inViewController:(UIViewController *)viewController
 {
-    [self showActionSheetDescription:actionSheetDescription inViewController:viewController fromView:nil];
+    [self showActionSheetDescription:actionSheetDescription inViewController:viewController fromView:viewController.view];
 }
 
 + (void)showActionSheetDescription:(JMActionSheetDescription *)actionSheetDescription inViewController:(UIViewController *)viewController fromView:(UIView *)view
diff --git a/Pod/Classes/JMActionSheetCollectionItem.h b/Pod/Classes/JMActionSheetCollectionItem.h
index 7a97da4..6270fdc 100644
--- a/Pod/Classes/JMActionSheetCollectionItem.h
+++ b/Pod/Classes/JMActionSheetCollectionItem.h
@@ -17,7 +17,7 @@
 @property (assign, nonatomic) UIViewContentMode actionImageContentMode;
 @end
 
-typedef void (^JMActionSheetSelectedCollectionItemBlock)(id selectedItem);
+typedef void (^JMActionSheetSelectedCollectionItemBlock)(__nonnull id selectedItem);
 
 @interface JMActionSheetCollectionItem : JMActionSheetItem
 
diff --git a/Pod/Classes/JMActionSheetPickerItem.h b/Pod/Classes/JMActionSheetPickerItem.h
index 89eed9a..1996857 100644
--- a/Pod/Classes/JMActionSheetPickerItem.h
+++ b/Pod/Classes/JMActionSheetPickerItem.h
@@ -10,7 +10,7 @@
 
 @protocol JMActionSheetPickerItemDisplayable <NSObject>
 
-- (NSString *)displayableValueForActionSheetPicker;
+- (nonnull NSString *)displayableValueForActionSheetPicker;
 
 @end