Use type-safe keypath constructor in PFFileState.

Author: nlutsenko

Parse/Internal/File/State/PFFileState.m

@@ -28,11 +28,9 @@ @implementation PFFileState
 ///--------------------------------------
 
 + (NSDictionary *)propertyAttributes {
-    return @{
-        @"name" : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy],
-        @"urlString" : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy],
-        @"mimeType" : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy],
-    };
+    return @{ PFFileStatePropertyName(name) : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy],
+              PFFileStatePropertyName(urlString) : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy],
+              PFFileStatePropertyName(mimeType) : [PFPropertyAttributes attributesWithAssociationType:PFPropertyInfoAssociationTypeCopy] };
 }
 
 ///--------------------------------------

Parse/Internal/File/State/PFFileState_Private.h

@@ -9,6 +9,17 @@
 
 #import "PFFileState.h"
 
+#import "PFMacros.h"
+
+/**
+ Returns NSString representation of a property.
+
+ @param NAME The name of the property.
+
+ @return NSString representation of a given property.
+ */
+#define PFFileStatePropertyName(NAME) @keypath(PFFileState, NAME)
+
 NS_ASSUME_NONNULL_BEGIN
 
 @interface PFFileState ()