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Implemented max number of photos that can be selected #3

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2c3fc04
Implemented max number of photos that can be selected
olejnjak Jun 11, 2015
1aba110
Fixed colectionView cell states when collectionView is not expanded
olejnjak Jun 11, 2015
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1 change: 1 addition & 0 deletions Example/DVGAssetPickerController/DVGViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ - (IBAction)pickPhoto:(id)sender
{
DVGAssetPickerViewController *picker = [[DVGAssetPickerViewController alloc] init];
picker.delegate = self;
picker.maxNumberOfAssets = 2;
[self presentViewController:picker animated:YES completion:nil];
}

Expand Down
1 change: 1 addition & 0 deletions Pod/Classes/DVGAssetPickerViewController.h
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Expand Up @@ -33,5 +33,6 @@ typedef NS_ENUM(NSUInteger, DVGAssetPickerMenuItem) {
- (void)cancel;
@property (nonatomic, weak) id<DVGAssetPickerDelegate> delegate;
@property (strong, nonatomic) ALAssetsLibrary *assetsLibrary;
@property (nonatomic) NSUInteger maxNumberOfAssets;

@end
29 changes: 29 additions & 0 deletions Pod/Classes/DVGAssetPickerViewController.m
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Expand Up @@ -24,6 +24,7 @@
static CGFloat const kCollectionViewExpandedHeight = 308.f;
static CGFloat const kCollectionViewPadding = 4.f;
static NSTimeInterval const kExpandAnimationDuration = 0.3;
static CGFloat const kDefaultDisabledSelectionAlpha = .6;

@interface DVGAssetPickerViewController ()
<UIViewControllerTransitioningDelegate,
Expand Down Expand Up @@ -359,6 +360,15 @@ - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView

UIImage *thumbnail = [UIImage imageWithCGImage:[asset aspectRatioThumbnail]];
cell.imageView.image = thumbnail;

if ([self canSelectAnotherAsset] || [self.selectedAssets containsObject:asset])
{
cell.imageView.alpha = 1;
}
else
{
cell.imageView.alpha = kDefaultDisabledSelectionAlpha;
}

return cell;
}
Expand All @@ -373,6 +383,15 @@ - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
DVGAssetPickerCheckmarkView *checkmark = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"Checkmark" forIndexPath:indexPath];
checkmark.selected = [self.selectedAssets containsObject:asset];
view = checkmark;

if ([self canSelectAnotherAsset] || [self.selectedAssets containsObject:asset])
{
view.hidden = NO;
}
else
{
view.hidden = YES;
}
}

return view;
Expand All @@ -383,6 +402,8 @@ - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
ALAsset *asset = self.assets[indexPath.row];

if ([self canSelectAnotherAsset] == NO && ![self.selectedAssets containsObject:asset]) return;

if (!self.collectionViewExpanded) {
self.selectedAssets = [NSMutableSet setWithObject:asset];
Expand All @@ -394,6 +415,7 @@ - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPa
DVGAssetPickerCollectionLayout *layout = (id)self.collectionView.collectionViewLayout;
layout.showCheckmarks = self.collectionViewExpanded;
[self.tableView reloadData];
[collectionView reloadData];
}];
}
else {
Expand Down Expand Up @@ -450,4 +472,11 @@ - (UIPresentationController *)presentationControllerForPresentedViewController:(
presentingViewController:presenting];
}

#pragma mark - Helpers

- (BOOL)canSelectAnotherAsset
{
return self.maxNumberOfAssets == 0 || self.selectedAssets.count < self.maxNumberOfAssets;
}

@end