使用Photos获取所有图片，在用CollectionView进行排版
1.首先导入#import<Photos/Photos.h>
2.判断用户是否打开了相册权限
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
NSLog(@"用户允许授权相册");
[self photoIamge];
}else {
NSLog(@"用户拒绝授权相册");
}
}];
3.获取相册内所有照片资源
- (NSMutableArray*)getAllAssetInPhotoAblumWithAscending:(BOOL)ascending{ NSMutableArray*assets = [NSMutableArray array];
PHFetchOptions *option = [[PHFetchOptions alloc] init];
//ascending 为YES时，按照照片的创建时间升序排列;为NO时，则降序排列
option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:ascending]];
PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:option];
[result enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
PHAsset *asset = (PHAsset *)obj;
// NSLog(@"照片名%@", [asset valueForKey:@"filename"]);
[assets addObject:asset];
}];
return assets;
}
4.添加图片到CollectionView
-(void)photoIamge
{
phAssets = [self getAllAssetInPhotoAblumWithAscending:YES];
for (PHAsset *set in phAssets) {
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
options.synchronous=YES;
//原图宽高(不建设使用，太大)
// CGSize imageSize=CGSizeMake(set.pixelWidth, set.pixelHeight);
[[PHImageManager defaultManager] requestImageForAsset:set targetSize:CGSizeZero contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage *result, NSDictionary *info) {
//设置图片
[array addObject:result];
[self.photoCollectionView reloadData];
}];
}
}
5.点击图片判断是否选择
//单元格个数
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return array.count;
}
//单元格内容
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *string=@"photoCell";
PhotoCollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:string forIndexPath:indexPath];
UIImage *image = array[indexPath.row];
cell.photoImageView.image=image;
cell.selectLabel.text=@"未选择";
return cell;
}
//点击单元格触发事件
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UIImage *image=[array objectAtIndex:indexPath.row];
PhotoCollectionViewCell *cell=(PhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
//已经12张图片，如果点击选择的着删除
BOOL select=YES;
//判断是否要删除图片
for (UIImage *selectImage in selectArray) {
if (selectImage==image) {
cell.selectLabel.text=@"未选择";
[selectArray removeObject:image];
select=NO;
break;
}
}
if (select==YES) {
//判断是否超过12张
if (selectArray.count>11) {
//提示不能超过12张
UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"照片不能超过12张" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *confirmAction=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alert addAction:confirmAction];
[self presentViewController:alert animated:YES completion:^{
}];
}
else
{
if ([cell.selectLabel.text isEqualToString:@"未选择"]) {
cell.selectLabel.text=@"选中";
[selectArray addObject:image];
}
else
{
cell.selectLabel.text=@"未选择";
[selectArray removeObject:image];
}
NSLog(@"%ld",selectArray.count);
NSLog(@"%@",selectArray);
}
}
}
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