add nullability annotations for swift

Author: isaced

FEPopupMenuController/FEPopupMenuController.h

@@ -11,17 +11,17 @@
 
 @interface FEPopupMenuController : UIViewController
 
-@property (nonatomic, strong) NSArray<FEPopupMenuItem *> *items;
+@property (nonatomic, strong) NSArray<FEPopupMenuItem *> * __nullable items;
 
 /**
  *  using FEPopupMenuItem init
  */
-- (instancetype)initWithItems:(NSArray<FEPopupMenuItem *> *)items;
+- (instancetype __nonnull)initWithItems:(NSArray<FEPopupMenuItem * > * __nonnull)items;
 
 /**
  *  popup the view controller
  */
-- (void)showInViewController:(UIViewController *)viewController atPosition:(CGPoint)position;
+- (void)showInViewController:(UIViewController * __nonnull)viewController atPosition:(CGPoint)position;
 
 /**
  *  dismiss the view controller

FEPopupMenuController/FEPopupMenuController.m

@@ -22,7 +22,7 @@ @interface FEPopupMenuController () <UITableViewDelegate,UITableViewDataSource,U
 
 @implementation FEPopupMenuController
 
--(instancetype)initWithItems:(NSArray *)items{
+-(instancetype)initWithItems:(NSArray<FEPopupMenuItem *> *)items {
     if (self = [super init]) {
         self.items = items;
         self.automaticDismiss = YES;
@@ -178,4 +178,4 @@ - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceive
     return transitioning;
 }
 
-@end
+@end