Add nullability annotations to all cells.

Author: nlutsenko

ParseUI/Classes/Cells/PFCollectionViewCell.h

@@ -21,6 +21,10 @@
 
 #import <UIKit/UIKit.h>
 
+#import <ParseUI/ParseUIConstants.h>
+
+PFUI_ASSUME_NONNULL_BEGIN
+
 @class PFImageView;
 @class PFObject;
 
@@ -50,6 +54,8 @@
 
  @param object An instance of `PFObject` to update from.
  */
-- (void)updateFromObject:(PFObject *)object;
+- (void)updateFromObject:(PFUI_NULLABLE PFObject *)object;
 
 @end
+
+PFUI_ASSUME_NONNULL_END

ParseUI/Classes/Cells/PFPurchaseTableViewCell.h

@@ -21,8 +21,11 @@
 
 #import <UIKit/UIKit.h>
 
+#import <ParseUI/ParseUIConstants.h>
 #import <ParseUI/PFTableViewCell.h>
 
+PFUI_ASSUME_NONNULL_BEGIN
+
 /*!
  An enum that represents states of the PFPurchaseTableViewCell.
  @see PFPurchaseTableViewCell
@@ -53,11 +56,13 @@ typedef NS_ENUM(uint8_t, PFPurchaseTableViewCellState) {
 /*!
  @abstract Label where price of the product is displayed.
  */
-@property (nonatomic, strong, readonly) UILabel *priceLabel;
+@property (PFUI_NULLABLE_PROPERTY nonatomic, strong, readonly) UILabel *priceLabel;
 
 /*!
  @abstract Progress view that is shown, when the product is downloading.
  */
-@property (nonatomic, strong, readonly) UIProgressView *progressView;
+@property (PFUI_NULLABLE_PROPERTY nonatomic, strong, readonly) UIProgressView *progressView;
 
 @end
+
+PFUI_ASSUME_NONNULL_END

ParseUI/Classes/Cells/PFTableViewCell.h

@@ -21,8 +21,11 @@
 
 #import <UIKit/UIKit.h>
 
+#import <ParseUI/ParseUIConstants.h>
 #import <ParseUI/PFImageView.h>
 
+PFUI_ASSUME_NONNULL_BEGIN
+
 /*!
  The `PFTableViewCell` class represents a table view cell which can download and display remote images stored on Parse.
 
@@ -36,6 +39,8 @@
 
  @see PFImageView
  */
-@property (nonatomic, strong, readonly) PFImageView *imageView;
+@property (PFUI_NULLABLE_PROPERTY nonatomic, strong, readonly) PFImageView *imageView;
 
 @end
+
+PFUI_ASSUME_NONNULL_END