#import "ViewController.h" #import <Photos/Photos.h> @interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate> @property (weak, nonatomic) IBOutlet UIImageView *imageView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } - (IBAction)selectImage { [self getThumbnailImages]; } /** * 获得所有相簿的原图 */ - (void)getOriginalImages { // 获得所有的自定义相簿 PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; // 遍历所有的自定义相簿 for (PHAssetCollection *assetCollection in assetCollections) { [self enumerateAssetsInAssetCollection:assetCollection original:YES]; } // 获得相机胶卷 PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject; [self enumerateAssetsInAssetCollection:cameraRoll original:YES]; } /** * 获得所有相簿中的缩略图 */ - (void)getThumbnailImages { // 获得所有的自定义相簿 PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; // 遍历所有的自定义相簿 for (PHAssetCollection *assetCollection in assetCollections) { [self enumerateAssetsInAssetCollection:assetCollection original:NO]; } // 获得相机胶卷 PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject; [self enumerateAssetsInAssetCollection:cameraRoll original:NO]; } /** * 遍历相簿中的所有图片 * * @param assetCollection 相簿 * @param original 是否要原图 */ - (void)enumerateAssetsInAssetCollection:(PHAssetCollection *)assetCollection original:(BOOL)original { NSLog(@"相簿名:%@", assetCollection.localizedTitle); PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init]; // 同步获得图片, 只会返回1张图片 options.synchronous = YES; // 获得某个相簿中的所有PHAsset对象 PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil]; for (PHAsset *asset in assets) { // 是否要原图 CGSize size = original ? CGSizeMake(asset.pixelWidth, asset.pixelHeight) : CGSizeZero; // 从asset中获得图片 [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) { NSLog(@"%@", result); }]; } } /** * 获得相机胶卷中的所有图片 */ - (void)getImagesFromCameraRoll { // 获得相机胶卷中的所有图片 PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsWithOptions:nil]; __block int count = 0; for (PHAsset *asset in assets) { [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:CGSizeMake(asset.pixelWidth, asset.pixelHeight) contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) { NSLog(@"%@ - %zd", result, count++); }]; } } /** * 利用UIImagePickerController挑选图片 */ - (void)getImageFromIpc { // UIImagePickerController : 可以从系统自带的App(照片\相机)中获得图片 // 判断相册是否可以打开 if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return; UIImagePickerController *ipc = [[UIImagePickerController alloc] init]; // 打开照片应用(显示所有相簿) ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 打开照片应用(只显示"时刻"这个相簿) // ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; // 照相机 // ipc.sourceType = UIImagePickerControllerSourceTypeCamera; ipc.delegate = self; [self presentViewController:ipc animated:YES completion:nil]; } #pragma mark - <UIImagePickerControllerDelegate> - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info { // 销毁控制器 [picker dismissViewControllerAnimated:YES completion:nil]; // 设置图片 self.imageView.image = info[UIImagePickerControllerOriginalImage]; } @end
总结:1:从相册中选取照片可以利用UIImagePickerController,前提是必须遵守两个协议:
<UIImagePickerControllerDelegate, UINavigationControllerDelegate>但是此种方法只能获取到相册中的一张照片。使用方法如下:1:可以先判断其是否支持相机或是相册,不支持直接return,不执行以下代码 2:创建对象,设置代理,在设置sourceType(注意两种类型的区别),弹出就用presentViewController可以弹出相册,dissmiss返回到应用。实现代理方法获取图片: self.imageView.image = info[UIImagePickerControllerOriginalImage];3:UIImagePickerController显示中文界面:
1.Project-->Info-->Localizations添加Chinese
2.修改Target-->Info-->Localization native development region : China
- (void)getImageFromIpc
{
// UIImagePickerController : 可以从系统自带的App(照片\相机)中获得图片
// 判断相册是否可以打开
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
// 打开照片应用(显示所有相簿)
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
// 打开照片应用(只显示"时刻"这个相簿)
// ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
// 照相机
// ipc.sourceType = UIImagePickerControllerSourceTypeCamera;
ipc.delegate = self;
[self presentViewController:ipc animated:YES completion:nil];
}
#pragma mark - <UIImagePickerControllerDelegate>
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
// 销毁控制器
[picker dismissViewControllerAnimated:YES completion:nil];
// 设置图片
self.imageView.image = info[UIImagePickerControllerOriginalImage];
}
2:若是想多选照片:1:可用系统框架:#import <Photos/Photos.h> 2:使用步骤:1:先获得所有相簿,在获得相簿胶卷
PHAssetCollection
2:遍历相簿数组,得到每一个相册照片PHAsset,再利用PHAsset请求获得每一张照片
3:若想做成系统相簿的样式:1:此界面可采用九宫格搭建,或是采用collection搭建,建议用后者,因为后者可以有循环利用的机制,节省
内存
2:如下界面搭建:可以监听每张图片的点击,当点击到某张图片的时候,将封装好的蒙板和对勾,盖在上面,或是再移除