尝试修复iOS15偶现照片列表未滚动到底部的问题，release 3.7.1

README.md

@@ -128,7 +128,7 @@ A：不要去拿PHImageFileURLKey，没用的，只有通过Photos框架才能
 
 ## 六. Release Notes 最近更新     
 
-**3.7.0 修复iOS15.2下初次授权相册权限时的长时间卡顿&白屏问题** [#1547](https://github.com/banchichen/TZImagePickerController/issues/1547)               
+**3.7.1 修复iOS15.2下初次授权相册权限时的长时间卡顿&白屏问题** [#1547](https://github.com/banchichen/TZImagePickerController/issues/1547)               
 **3.6.7 修复Xcode13&iOS15下导航栏颜色异常问题**        
 3.6.2 新增allowEditVideo，单选视频时支持裁剪        
 3.6.0 修复iOS14下iCloud视频导出失败问题        

TZImagePickerController.podspec

 Pod::Spec.new do |s|
   s.name         = "TZImagePickerController"
-  s.version      = "3.7.0"
+  s.version      = "3.7.1"
   s.summary      = "A clone of UIImagePickerController, support picking multiple photos、original photo and video"
   s.homepage     = "https://github.com/banchichen/TZImagePickerController"
   s.license      = "MIT"
   s.author       = { "banchichen" => "tanzhenios@foxmail.com" }
   s.platform     = :ios
   s.ios.deployment_target = "8.0"
-  s.source       = { :git => "https://github.com/banchichen/TZImagePickerController.git", :tag => "3.7.0" }
+  s.source       = { :git => "https://github.com/banchichen/TZImagePickerController.git", :tag => "3.7.1" }
   s.requires_arc = true
   s.resources    = "TZImagePickerController/TZImagePickerController/*.{png,bundle}"
   s.source_files = "TZImagePickerController/TZImagePickerController/*.{h,m}"

TZImagePickerController.xcodeproj/project.pbxproj

@@ -823,7 +823,7 @@
 				INFOPLIST_FILE = TZImagePickerController/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				MARKETING_VERSION = 3.7.0;
+				MARKETING_VERSION = 3.7.1;
 				PRODUCT_BUNDLE_IDENTIFIER = tanzhenios2021.TZImagePickerController.www;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "";
@@ -847,7 +847,7 @@
 				INFOPLIST_FILE = TZImagePickerController/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				MARKETING_VERSION = 3.7.0;
+				MARKETING_VERSION = 3.7.1;
 				PRODUCT_BUNDLE_IDENTIFIER = tanzhenios2021.TZImagePickerController.www;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "";
@@ -934,7 +934,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 3.7.0;
+				MARKETING_VERSION = 3.7.1;
 				OTHER_LDFLAGS = "-all_load";
 				PRODUCT_BUNDLE_IDENTIFIER = tanzhen.TZImagePickerControllerFramework;
 				PRODUCT_NAME = TZImagePickerController;
@@ -975,7 +975,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 3.7.0;
+				MARKETING_VERSION = 3.7.1;
 				OTHER_LDFLAGS = "-all_load";
 				PRODUCT_BUNDLE_IDENTIFIER = tanzhen.TZImagePickerControllerFramework;
 				PRODUCT_NAME = TZImagePickerController;

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 3.7.0 - 2021.12.27
+//  version 3.7.1 - 2022.01.07
 //  更多信息，请前往项目的github地址：https://github.com/banchichen/TZImagePickerController
 
 /*

TZImagePickerController/TZImagePickerController/TZImagePickerController.m

@@ -4,7 +4,7 @@
 //
 //  Created by 谭真 on 15/12/24.
 //  Copyright © 2015年 谭真. All rights reserved.
-//  version 3.7.0 - 2021.12.27
+//  version 3.7.1 - 2022.01.07
 //  更多信息，请前往项目的github地址：https://github.com/banchichen/TZImagePickerController
 
 #import "TZImagePickerController.h"

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -148,7 +148,7 @@ static CGFloat itemMargin = 5;
         self->_collectionView.hidden = YES;
         [self configBottomToolBar];
         
-        [self scrollCollectionViewToBottom];
+        [self prepareScrollCollectionViewToBottom];
     });
 }
 
@@ -841,9 +841,25 @@ static CGFloat itemMargin = 5;
     }];
 }
 
+- (void)prepareScrollCollectionViewToBottom {
+    if (_shouldScrollToBottom && _models.count > 0) {
+        // try fix #1562：https://github.com/banchichen/TZImagePickerController/issues/1562
+        if (@available(iOS 15.0, *)) {
+            [_collectionView performBatchUpdates:^{} completion:^(BOOL finished) {
+                [self scrollCollectionViewToBottom];
+            }];
+        } else {
+            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+                [self scrollCollectionViewToBottom];
+            });
+        }
+    } else {
+        _collectionView.hidden = NO;
+    }
+}
+
 - (void)scrollCollectionViewToBottom {
     TZImagePickerController *tzImagePickerVc = (TZImagePickerController *)self.navigationController;
-    if (_shouldScrollToBottom && _models.count > 0) {
     NSInteger item = 0;
     if (tzImagePickerVc.sortAscendingByModificationDate) {
         item = _models.count - 1;
@@ -851,14 +867,9 @@ static CGFloat itemMargin = 5;
             item += 1;
         }
     }
-        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
     [self->_collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:item inSection:0] atScrollPosition:UICollectionViewScrollPositionBottom animated:NO];
     self->_shouldScrollToBottom = NO;
     self->_collectionView.hidden = NO;
-        });
-    } else {
-        _collectionView.hidden = NO;
-    }
 }
 
 - (void)checkSelectedModels {
@@ -990,7 +1001,7 @@ static CGFloat itemMargin = 5;
     [_collectionView reloadData];
     
     _shouldScrollToBottom = YES;
-    [self scrollCollectionViewToBottom];
+    [self prepareScrollCollectionViewToBottom];
 }
 
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {