优化照片排序，改成按更新时间排序

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -67,7 +67,8 @@ static CGFloat TZScreenScale;
         if (!allowPickingVideo) option.predicate = [NSPredicate predicateWithFormat:@"mediaType == %ld", PHAssetMediaTypeImage];
         if (!allowPickingImage) option.predicate = [NSPredicate predicateWithFormat:@"mediaType == %ld",
                                                     PHAssetMediaTypeVideo];
-        option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
+        // option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
+        option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"modificationDate" ascending:YES]];
         
         PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil];
         for (PHAssetCollection *collection in smartAlbums) {
@@ -98,7 +99,9 @@ static CGFloat TZScreenScale;
         if (!allowPickingVideo) option.predicate = [NSPredicate predicateWithFormat:@"mediaType == %ld", PHAssetMediaTypeImage];
         if (!allowPickingImage) option.predicate = [NSPredicate predicateWithFormat:@"mediaType == %ld",
                                                     PHAssetMediaTypeVideo];
-        option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
+        
+        // option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
+        option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"modificationDate" ascending:YES]];
         
         PHAssetCollectionSubtype smartAlbumSubtype = PHAssetCollectionSubtypeSmartAlbumUserLibrary | PHAssetCollectionSubtypeSmartAlbumRecentlyAdded | PHAssetCollectionSubtypeSmartAlbumVideos;
         // For iOS 9, We need to show ScreenShots Album && SelfPortraits Album

TZImagePickerController/TZImagePickerController/TZImagePickerController.h

@@ -4,7 +4,7 @@
 //
 //  Created by 谭真 on 15/12/24.
 //  Copyright © 2015年 谭真. All rights reserved.
-//
+//  version 1.4.4
 
 /*
  经过测试，比起xib的方式，把TZAssetCell改用纯代码的方式来写，滑动帧数明显提高了（约提高10帧左右）