新增导出视频代码；新增长按对图片排序的功能

TZImagePickerController.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		6D32B9BD1CD83640005CE1E0 /* LxGridViewFlowLayout.m in Sources */ = {isa = PBXBuildFile; fileRef = 6D32B9BC1CD83640005CE1E0 /* LxGridViewFlowLayout.m */; };
 		6DC358661CC8BAFD00898D29 /* TZImagePickerController.bundle in Resources */ = {isa = PBXBuildFile; fileRef = 6DC358651CC8BAFD00898D29 /* TZImagePickerController.bundle */; };
 		900E65811C2BB8D5003D9A9E /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 900E65801C2BB8D5003D9A9E /* main.m */; };
 		900E65841C2BB8D5003D9A9E /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 900E65831C2BB8D5003D9A9E /* AppDelegate.m */; };
@@ -46,6 +47,8 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		6D32B9BB1CD83640005CE1E0 /* LxGridViewFlowLayout.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = LxGridViewFlowLayout.h; sourceTree = "<group>"; };
+		6D32B9BC1CD83640005CE1E0 /* LxGridViewFlowLayout.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = LxGridViewFlowLayout.m; sourceTree = "<group>"; };
 		6DC358651CC8BAFD00898D29 /* TZImagePickerController.bundle */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.plug-in"; path = TZImagePickerController.bundle; sourceTree = "<group>"; };
 		900E657C1C2BB8D5003D9A9E /* TZImagePickerController.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = TZImagePickerController.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		900E65801C2BB8D5003D9A9E /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
@@ -146,6 +149,8 @@
 				900E65831C2BB8D5003D9A9E /* AppDelegate.m */,
 				900E65851C2BB8D5003D9A9E /* ViewController.h */,
 				900E65861C2BB8D5003D9A9E /* ViewController.m */,
+				6D32B9BB1CD83640005CE1E0 /* LxGridViewFlowLayout.h */,
+				6D32B9BC1CD83640005CE1E0 /* LxGridViewFlowLayout.m */,
 				9038D58F1C3974F0007DE549 /* TZTestCell.h */,
 				9038D5901C3974F0007DE549 /* TZTestCell.m */,
 				900E65881C2BB8D5003D9A9E /* Main.storyboard */,
@@ -346,6 +351,7 @@
 				90EBF5D61C2E298000CB9BCC /* UIView+Layout.m in Sources */,
 				90CE84B71C3BABB6003D0779 /* TZVideoPlayerController.m in Sources */,
 				900EF0021C2BD7E400EA709B /* TZAssetCell.m in Sources */,
+				6D32B9BD1CD83640005CE1E0 /* LxGridViewFlowLayout.m in Sources */,
 				900EF0161C2C134900EA709B /* TZPhotoPreviewCell.m in Sources */,
 				900E65871C2BB8D5003D9A9E /* ViewController.m in Sources */,
 				90CE84AE1C3A89EF003D0779 /* TZImageManager.m in Sources */,
@@ -493,6 +499,10 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				FRAMEWORK_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/TZImagePickerController",
+				);
 				INFOPLIST_FILE = TZImagePickerController/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 6.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
@@ -509,6 +519,10 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				FRAMEWORK_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/TZImagePickerController",
+				);
 				INFOPLIST_FILE = TZImagePickerController/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 6.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";

TZImagePickerController/AppDelegate.m

@@ -16,30 +16,27 @@
 
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-    // Override point for customization after application launch.
     return YES;
 }
 
 - (void)applicationWillResignActive:(UIApplication *)application {
-    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
-    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
+
 }
 
 - (void)applicationDidEnterBackground:(UIApplication *)application {
-    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
-    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+  
 }
 
 - (void)applicationWillEnterForeground:(UIApplication *)application {
-    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
+   
 }
 
 - (void)applicationDidBecomeActive:(UIApplication *)application {
-    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+   
 }
 
 - (void)applicationWillTerminate:(UIApplication *)application {
-    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+
 }
 
 @end

TZImagePickerController/Assets.xcassets/photo_delete.imageset/Contents.json

+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "photo_delete@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file

TZImagePickerController/Base.lproj/Main.storyboard

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="9531" systemVersion="14F1509" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10116" systemVersion="15E65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9529"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
     </dependencies>
     <scenes>
         <!--View Controller-->

TZImagePickerController/Info.plist

@@ -20,6 +20,8 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>1</string>
+	<key>CFBundleAllowMixedLocalizations</key>
+	<true/>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UILaunchStoryboardName</key>

TZImagePickerController/LxGridViewFlowLayout.h

+//
+//  LxGridViewFlowLayout.h
+//  LxGridView
+//
+
+#import <UIKit/UIKit.h>
+
+
+@interface LxGridViewFlowLayout : UICollectionViewFlowLayout
+
+@property (nonatomic,assign) BOOL panGestureRecognizerEnable;
+@property (nonatomic, assign) NSInteger itemCount;
+
+@end
+
+@protocol LxGridViewDataSource <UICollectionViewDataSource>
+
+@optional
+
+- (void)collectionView:(UICollectionView *)collectionView
+       itemAtIndexPath:(NSIndexPath *)sourceIndexPath
+   willMoveToIndexPath:(NSIndexPath *)destinationIndexPath;
+- (void)collectionView:(UICollectionView *)collectionView
+       itemAtIndexPath:(NSIndexPath *)sourceIndexPath
+    didMoveToIndexPath:(NSIndexPath *)destinationIndexPath;
+
+- (BOOL)collectionView:(UICollectionView *)collectionView
+canMoveItemAtIndexPath:(NSIndexPath *)indexPath;
+- (BOOL)collectionView:(UICollectionView *)collectionView
+       itemAtIndexPath:(NSIndexPath *)sourceIndexPath
+    canMoveToIndexPath:(NSIndexPath *)destinationIndexPath;
+
+@end
+
+@protocol LxGridViewDelegateFlowLayout <UICollectionViewDelegateFlowLayout>
+
+@optional
+
+- (void)collectionView:(UICollectionView *)collectionView
+                layout:(UICollectionViewLayout *)collectionViewLayout
+willBeginDraggingItemAtIndexPath:(NSIndexPath *)indexPath;
+- (void)collectionView:(UICollectionView *)collectionView
+                layout:(UICollectionViewLayout *)collectionViewLayout
+didBeginDraggingItemAtIndexPath:(NSIndexPath *)indexPath;
+- (void)collectionView:(UICollectionView *)collectionView
+                layout:(UICollectionViewLayout *)collectionViewLayout
+willEndDraggingItemAtIndexPath:(NSIndexPath *)indexPath;
+- (void)collectionView:(UICollectionView *)collectionView
+                layout:(UICollectionViewLayout *)collectionViewLayout
+didEndDraggingItemAtIndexPath:(NSIndexPath *)indexPath;
+
+@end
\ No newline at end of file

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -40,6 +40,9 @@
 /// Get video 获得视频
 - (void)getVideoWithAsset:(id)asset completion:(void (^)(AVPlayerItem * playerItem, NSDictionary * info))completion;
 
+/// Export video 导出视频
+- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion;
+
 /// Get photo bytes 获得一组照片的大小
 - (void)getPhotosBytesWithArray:(NSArray *)photos completion:(void (^)(NSString *totalBytes))completion;
 

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -409,6 +409,58 @@
     }
 }
 
+#pragma mark - Export video
+
+- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion {
+    if ([asset isKindOfClass:[PHAsset class]]) {
+        PHVideoRequestOptions* options = [[PHVideoRequestOptions alloc] init];
+        options.version = PHVideoRequestOptionsVersionOriginal;
+        options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
+        options.networkAccessAllowed = YES;
+        [[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset* avasset, AVAudioMix* audioMix, NSDictionary* info){
+            // NSLog(@"Info:\n%@",info);
+            AVURLAsset* myAsset = (AVURLAsset*)avasset;
+            // NSLog(@"AVAsset URL: %@",myAsset.URL);
+            
+            NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:myAsset];
+            // NSLog(@"%@",compatiblePresets);
+            
+            if ([compatiblePresets containsObject:AVAssetExportPresetHighestQuality]) {
+                AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:myAsset presetName:AVAssetExportPresetMediumQuality];
+                NSDateFormatter *formater = [[NSDateFormatter alloc] init];
+                [formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss"];
+                NSString *outputPath = [NSHomeDirectory() stringByAppendingFormat:@"/tmp/output-%@.mp4", [formater stringFromDate:[NSDate date]]];
+                NSLog(@"video outputPath = %@",outputPath);
+                
+                exportSession.outputURL = [NSURL fileURLWithPath:outputPath];
+                exportSession.outputFileType = AVFileTypeMPEG4;
+                exportSession.shouldOptimizeForNetworkUse = YES;
+                [exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
+                    switch (exportSession.status) {
+                        case AVAssetExportSessionStatusUnknown:
+                            NSLog(@"AVAssetExportSessionStatusUnknown"); break;
+                        case AVAssetExportSessionStatusWaiting:
+                            NSLog(@"AVAssetExportSessionStatusWaiting"); break;
+                        case AVAssetExportSessionStatusExporting:
+                            NSLog(@"AVAssetExportSessionStatusExporting"); break;
+                        case AVAssetExportSessionStatusCompleted:
+                            NSLog(@"AVAssetExportSessionStatusCompleted");
+                            if (completion) {
+                                completion(outputPath);
+                            }
+                            break;
+                        case AVAssetExportSessionStatusFailed:
+                            NSLog(@"AVAssetExportSessionStatusFailed"); break;
+                        default: break;
+                    }
+                }];
+            }
+        }];
+    } else {
+        NSLog(@"iOS8以前的系统，导出视频代码暂未更新...");
+    }
+}
+
 #pragma mark - Private Method
 
 - (TZAlbumModel *)modelWithResult:(id)result name:(NSString *)name{
@@ -434,6 +486,8 @@
         else if ([name rangeOfString:@"Selfies"].location != NSNotFound) newName = @"自拍";
         else if ([name rangeOfString:@"shots"].location != NSNotFound)   newName = @"截屏";
         else if ([name rangeOfString:@"Videos"].location != NSNotFound)  newName = @"视频";
+        else if ([name rangeOfString:@"Panoramas"].location != NSNotFound)  newName = @"全景照片";
+        else if ([name rangeOfString:@"Favorites"].location != NSNotFound)  newName = @"个人收藏";
         else newName = name;
         return newName;
     } else {
@@ -442,11 +496,15 @@
 }
 
 - (UIImage *)scaleImage:(UIImage *)image toSize:(CGSize)size {
+    if (image.size.width > size.width) {
         UIGraphicsBeginImageContext(size);
         [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
         UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
         UIGraphicsEndImageContext();
         return newImage;
+    } else {
+        return image;
+    }
 }
 
 - (UIImage *)fixOrientation:(UIImage *)aImage {

TZImagePickerController/TZTestCell.h

@@ -11,6 +11,10 @@
 @interface TZTestCell : UICollectionViewCell
 
 @property (nonatomic, strong) UIImageView *imageView;
+@property (nonatomic, strong) UIButton *deleteBtn;
+@property (nonatomic, assign) NSInteger row;
+
+- (UIView *)snapshotView;
 
 @end
 

TZImagePickerController/TZTestCell.m

@@ -7,6 +7,7 @@
 //
 
 #import "TZTestCell.h"
+#import "UIView+Layout.h"
 
 @implementation TZTestCell
 
@@ -19,6 +20,13 @@
         _imageView.contentMode = UIViewContentModeScaleAspectFill;
         [self addSubview:_imageView];
         self.clipsToBounds = YES;
+        
+        _deleteBtn = [UIButton buttonWithType:UIButtonTypeCustom];
+        [_deleteBtn setImage:[UIImage imageNamed:@"photo_delete"] forState:UIControlStateNormal];
+        _deleteBtn.frame = CGRectMake(self.tz_width - 36, 0, 36, 36);
+        _deleteBtn.imageEdgeInsets = UIEdgeInsetsMake(-10, 0, 0, -10);
+        _deleteBtn.alpha = 0.6;
+        [self addSubview:_deleteBtn];
     }
     return self;
 }
@@ -28,4 +36,32 @@
     _imageView.frame = self.bounds;
 }
 
+- (void)setRow:(NSInteger)row {
+    _row = row;
+    _deleteBtn.tag = row;
+}
+
+- (UIView *)snapshotView {
+    UIView *snapshotView = [[UIView alloc]init];
+    
+    UIView *cellSnapshotView = nil;
+    
+    if ([self respondsToSelector:@selector(snapshotViewAfterScreenUpdates:)]) {
+        cellSnapshotView = [self snapshotViewAfterScreenUpdates:NO];
+    } else {
+        CGSize size = CGSizeMake(self.bounds.size.width + 20, self.bounds.size.height + 20);
+        UIGraphicsBeginImageContextWithOptions(size, self.opaque, 0);
+        [self.layer renderInContext:UIGraphicsGetCurrentContext()];
+        UIImage * cellSnapshotImage = UIGraphicsGetImageFromCurrentImageContext();
+        UIGraphicsEndImageContext();
+        cellSnapshotView = [[UIImageView alloc]initWithImage:cellSnapshotImage];
+    }
+    
+    snapshotView.frame = CGRectMake(0, 0, cellSnapshotView.frame.size.width, cellSnapshotView.frame.size.height);
+    cellSnapshotView.frame = CGRectMake(0, 0, cellSnapshotView.frame.size.width, cellSnapshotView.frame.size.height);
+    
+    [snapshotView addSubview:cellSnapshotView];
+    return snapshotView;
+}
+
 @end

TZImagePickerController/ViewController.m

@@ -10,15 +10,20 @@
 #import "TZImagePickerController.h"
 #import "UIView+Layout.h"
 #import "TZTestCell.h"
+#import <AssetsLibrary/AssetsLibrary.h>
+#import <Photos/Photos.h>
+#import "LxGridViewFlowLayout.h"
+#import "TZImageManager.h"
 
 @interface ViewController ()<TZImagePickerControllerDelegate,UICollectionViewDataSource,UICollectionViewDelegate> {
-    UICollectionView *_collectionView;
     NSMutableArray *_selectedPhotos;
     NSMutableArray *_selectedAssets;
 
     CGFloat _itemWH;
     CGFloat _margin;
+    LxGridViewFlowLayout *_layout;
 }
+@property (nonatomic, strong) UICollectionView *collectionView;
 @end
 
 @implementation ViewController
@@ -32,13 +37,13 @@
 }
 
 - (void)configCollectionView {
-    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
+    _layout = [[LxGridViewFlowLayout alloc] init];
     _margin = 4;
     _itemWH = (self.view.tz_width - 2 * _margin - 4) / 3 - _margin;
-    layout.itemSize = CGSizeMake(_itemWH, _itemWH);
-    layout.minimumInteritemSpacing = _margin;
-    layout.minimumLineSpacing = _margin;
-    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(_margin, 120, self.view.tz_width - 2 * _margin, 400) collectionViewLayout:layout];
+    _layout.itemSize = CGSizeMake(_itemWH, _itemWH);
+    _layout.minimumInteritemSpacing = _margin;
+    _layout.minimumLineSpacing = _margin;
+    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(_margin, 120, self.view.tz_width - 2 * _margin, 400) collectionViewLayout:_layout];
     CGFloat rgb = 244 / 255.0;
     _collectionView.backgroundColor = [UIColor colorWithRed:rgb green:rgb blue:rgb alpha:1.0];
     _collectionView.contentInset = UIEdgeInsetsMake(4, 0, 0, 2);
@@ -59,9 +64,13 @@
     TZTestCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"TZTestCell" forIndexPath:indexPath];
     if (indexPath.row == _selectedPhotos.count) {
         cell.imageView.image = [UIImage imageNamed:@"AlbumAddBtn.png"];
+        cell.deleteBtn.hidden = YES;
     } else {
         cell.imageView.image = _selectedPhotos[indexPath.row];
+        cell.deleteBtn.hidden = NO;
     }
+    cell.deleteBtn.tag = indexPath.row;
+    [cell.deleteBtn addTarget:self action:@selector(deleteBtnClik:) forControlEvents:UIControlEventTouchUpInside];
     return cell;
 }
 
@@ -69,8 +78,31 @@
     if (indexPath.row == _selectedPhotos.count) { [self pickPhotoButtonClick:nil];}
 }
 
+- (void)collectionView:(UICollectionView *)collectionView itemAtIndexPath:(NSIndexPath *)sourceIndexPath didMoveToIndexPath:(NSIndexPath *)destinationIndexPath {
+    if (sourceIndexPath.item >= _selectedPhotos.count || destinationIndexPath.item >= _selectedPhotos.count) return;
+    UIImage *image = _selectedPhotos[sourceIndexPath.item];
+    if (image) {
+        [_selectedPhotos removeObjectAtIndex:sourceIndexPath.item];
+        [_selectedPhotos insertObject:image atIndex:destinationIndexPath.item];
+        [_collectionView reloadData];
+    }
+}
+
 #pragma mark Click Event
 
+- (void)deleteBtnClik:(UIButton *)sender {
+    [_selectedPhotos removeObjectAtIndex:sender.tag];
+    [_selectedAssets removeObjectAtIndex:sender.tag];
+    _layout.itemCount = _selectedPhotos.count;
+    
+    [_collectionView performBatchUpdates:^{
+        NSIndexPath *indexPath = [NSIndexPath indexPathForItem:sender.tag inSection:0];
+        [_collectionView deleteItemsAtIndexPaths:@[indexPath]];
+    } completion:^(BOOL finished) {
+        [_collectionView reloadData];
+    }];
+}
+
 - (IBAction)pickPhotoButtonClick:(UIButton *)sender {
     TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:9 delegate:self];
     imagePickerVc.selectedAssets = _selectedAssets; // optional, 可选的
@@ -109,6 +141,7 @@
 - (void)imagePickerController:(TZImagePickerController *)picker didFinishPickingPhotos:(NSArray *)photos sourceAssets:(NSArray *)assets isSelectOriginalPhoto:(BOOL)isSelectOriginalPhoto {
     _selectedPhotos = [NSMutableArray arrayWithArray:photos];
     _selectedAssets = [NSMutableArray arrayWithArray:assets];
+    _layout.itemCount = _selectedPhotos.count;
     [_collectionView reloadData];
     _collectionView.contentSize = CGSizeMake(0, ((_selectedPhotos.count + 2) / 3 ) * (_margin + _itemWH));
 }
@@ -117,9 +150,18 @@
 /// 用户选择好了视频
 - (void)imagePickerController:(TZImagePickerController *)picker didFinishPickingVideo:(UIImage *)coverImage sourceAssets:(id)asset {
     [_selectedPhotos addObjectsFromArray:@[coverImage]];
+    _layout.itemCount = _selectedPhotos.count;
+    /* 
+    // open this code to send video / 打开这段代码发送视频
+    [[TZImageManager manager] getVideoOutputPathWithAsset:asset completion:^(NSString *outputPath) {
+        NSLog(@"视频导出到本地完成,沙盒路径为:%@",outputPath);
+        // Export completed, send video here, send by outputPath or NSData
+        // 导出完成，在这里写上传代码，通过路径或者通过NSData上传
+        
+    }];
+     */
     [_collectionView reloadData];
     _collectionView.contentSize = CGSizeMake(0, ((_selectedPhotos.count + 2) / 3 ) * (_margin + _itemWH));
 }
 
-
 @end