CloudKit iOS 12.1 to 12.2 API Differences

CKAsset.h
Declaration
From@property (nonatomic, readonly, copy, nonnull) NSURL *fileURL
To@property (nonatomic, readonly, copy, nullable) NSURL *fileURL

CKNotification.h
Declaration
From+ (nonnull instancetype)notificationFromRemoteNotificationDictionary:(nonnull NSDictionary *)notificationDictionary
To+ (nullable instancetype)notificationFromRemoteNotificationDictionary:(nonnull NSDictionary *)notificationDictionary