ios開發多選照片實現

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#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];}/** *  獲得所有相簿的原圖 */- (void)getOriginalImages{    // 獲得所有的自訂相簿    PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];    // 遍曆所有的自訂相簿    for (PHAssetCollection *assetCollection in assetCollections) {        [self enumerateAssetsInAssetCollection:assetCollection original:YES];    }        // 獲得相機菲林    PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;    [self enumerateAssetsInAssetCollection:cameraRoll original:YES];}/** *  獲得所有相簿中的縮圖 */- (void)getThumbnailImages{    // 獲得所有的自訂相簿    PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];    // 遍曆所有的自訂相簿    for (PHAssetCollection *assetCollection in assetCollections) {        [self enumerateAssetsInAssetCollection:assetCollection original:NO];    }        // 獲得相機菲林    PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;    [self enumerateAssetsInAssetCollection:cameraRoll original:NO];}/** *  遍曆相簿中的所有圖片 * *  @param assetCollection 相簿 *  @param original        是否要原圖 */- (void)enumerateAssetsInAssetCollection:(PHAssetCollection *)assetCollection original:(BOOL)original{    NSLog(@"相簿名:%@", assetCollection.localizedTitle);        PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];    // 同步獲得圖片, 只會返回1張圖片    options.synchronous = YES;    // 獲得某個相簿中的所有PHAsset對象    PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];    for (PHAsset *asset in assets) {        // 是否要原圖        CGSize size = original ? CGSizeMake(asset.pixelWidth, asset.pixelHeight) : CGSizeZero;                // 從asset中獲得圖片        [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {            NSLog(@"%@", result);        }];    }}/** *  獲得相機菲林中的所有圖片 */- (void)getImagesFromCameraRoll{    // 獲得相機菲林中的所有圖片    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挑選圖片 */- (void)getImageFromIpc{    // UIImagePickerController : 可以從系統內建的App(照片\相機)中獲得圖片    // 判斷相簿是否可以開啟    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];    // 開啟照片應用(顯示所有相簿)    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    // 開啟照片應用(只顯示"時刻"這個相簿)    // ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;    // 照相機    // 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{    // 銷毀控制器    [picker dismissViewControllerAnimated:YES completion:nil];    // 設定圖片    self.imageView.image = info[UIImagePickerControllerOriginalImage];}@end

總結：1：從相簿中選取照片可以利用UIImagePickerController，前提是必須遵守兩個協議：

<UIImagePickerControllerDelegate, UINavigationControllerDelegate>但是此種方法只能擷取到相簿中的一張照片。使用方法如下：1：可以先判斷其是否支援相機或是相簿，不支援直接return，不執行以下代碼 2：建立對象，設定代理，在設定sourceType（注意兩種類型的區別），彈出就用presentViewController可以彈出相簿，dissmiss返回到應用。實現代理方法擷取圖片：   self.imageView.image = info[UIImagePickerControllerOriginalImage];3：UIImagePickerController顯示中文介面：

1.Project-->Info-->Localizations添加Chinese

2.修改Target-->Info-->Localization native development region ： China 

- (void)getImageFromIpc

{

    // UIImagePickerController : 可以從系統內建的App(照片\相機)中獲得圖片

 

    // 判斷相簿是否可以開啟

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;

 

    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];

    // 開啟照片應用(顯示所有相簿)

    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    // 開啟照片應用(只顯示"時刻"這個相簿)

    // ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

    // 照相機

    // 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

{

    // 銷毀控制器

    [picker dismissViewControllerAnimated:YES completion:nil];

 

    // 設定圖片

    self.imageView.image = info[UIImagePickerControllerOriginalImage];

}

 2：若是想多選照片：1：可用系統架構：#import <Photos/Photos.h>  2：使用步驟：1：先獲得所有相簿，在獲得相簿菲林  

PHAssetCollection

2：遍曆相簿數組，得到每一個相簿照片PHAsset，再利用PHAsset請求獲得每一張照片

3：若想做成系統相簿的樣式：1：此介面可採用九宮格搭建，或是採用collection搭建，建議用後者，因為後者可以有迴圈利用的機制，節省

記憶體

2：如下介面搭建：可以監聽每張圖片的點擊，當點擊到某張圖片的時候，將封裝好的蒙板和對勾，蓋在上面，或是再移除

 

ios開發多選照片實現