• ios 用户相册


      1 ## 获得自定义的所有相簿
      2 
      3 // 获得所有的自定义相簿
      4 PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
      5 // 遍历所有的自定义相簿
      6 for (PHAssetCollection *assetCollection in assetCollections) {
      7 
      8 }
      9 
     10 
     11 ## 获得相机胶卷相簿
     12 
     13 // 获得相机胶卷
     14 PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;
     15 
     16 
     17 ## 获得某个相簿的缩略图
     18 
     19 PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
     20 // 同步获得图片, 只会返回1张图片
     21 options.synchronous = YES;
     22 
     23 // 获得某个相簿中的所有PHAsset对象
     24 PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
     25 for (PHAsset *asset in assets) {
     26     CGSize size = CGSizeZero;
     27 
     28     // 从asset中获得图片
     29     [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
     30         NSLog(@"%@", result);
     31     }];
     32 }
     33 
     34 
     35 ## 获得某个相簿的原图
     36 
     37 PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
     38 // 同步获得图片, 只会返回1张图片
     39 options.synchronous = YES;
     40 
     41 // 获得某个相簿中的所有PHAsset对象
     42 PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
     43 for (PHAsset *asset in assets) {
     44     CGSize size = CGSizeMake(asset.pixelWidth, asset.pixelHeight);
     45 
     46     // 从asset中获得图片
     47     [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
     48         NSLog(@"%@", result);
     49     }];
     50 }
     51 
     52 
     53 ## 利用UIImagePickerController挑选图片
     54 
     55 // UIImagePickerController : 可以从系统自带的App(照片相机)中获得图片
     56 
     57 // 判断相册是否可以打开
     58 if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;
     59 
     60 UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
     61 // 打开照片应用(显示所有相簿)
     62 ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
     63 // 打开照片应用(只显示"时刻"这个相簿)
     64 // ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
     65 // 照相机
     66 // ipc.sourceType = UIImagePickerControllerSourceTypeCamera;
     67 ipc.delegate = self;
     68 [self presentViewController:ipc animated:YES completion:nil];
     69 
     70 #pragma mark - <UIImagePickerControllerDelegate>
     71 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
     72 {
     73     // 销毁控制器
     74     [picker dismissViewControllerAnimated:YES completion:nil];
     75 
     76     // 设置图片
     77     self.imageView.image = info[UIImagePickerControllerOriginalImage];
     78 }
     79 
     80 
     81 ## NaN错误
     82 - 错误起因:0被当做除数, 比如 10 / 0
     83 
     84 ## 最简单的方法保存图片到相机胶卷
     85 
     86 UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
     87 
     88 /**
     89  *  通过UIImageWriteToSavedPhotosAlbum函数写入图片完毕后就会调用这个方法
     90  *
     91  *  @param image       写入的图片
     92  *  @param error       错误信息
     93  *  @param contextInfo UIImageWriteToSavedPhotosAlbum函数的最后一个参数
     94  */
     95 - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
     96 {
     97     if (error) {
     98         [SVProgressHUD showErrorWithStatus:@"图片保存失败!"];
     99     } else {
    100         [SVProgressHUD showSuccessWithStatus:@"图片保存成功!"];
    101     }
    102 }
    103 
    104 
    105 ## 保存图片到自定义相册
    106 
    107 - (IBAction)save {
    108     /*
    109      PHAuthorizationStatusNotDetermined,     用户还没有做出选择
    110      PHAuthorizationStatusDenied,            用户拒绝当前应用访问相册(用户当初点击了"不允许")
    111      PHAuthorizationStatusAuthorized         用户允许当前应用访问相册(用户当初点击了"好")
    112      PHAuthorizationStatusRestricted,        因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系)
    113      */
    114 
    115     // 判断授权状态
    116     PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    117     if (status == PHAuthorizationStatusRestricted) { // 因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系)
    118         [SVProgressHUD showErrorWithStatus:@"因为系统原因, 无法访问相册"];
    119     } else if (status == PHAuthorizationStatusDenied) { // 用户拒绝当前应用访问相册(用户当初点击了"不允许")
    120         MKLog(@"提醒用户去[设置-隐私-照片-xxx]打开访问开关");
    121     } else if (status == PHAuthorizationStatusAuthorized) { // 用户允许当前应用访问相册(用户当初点击了"好")
    122         [self saveImage];
    123     } else if (status == PHAuthorizationStatusNotDetermined) { // 用户还没有做出选择
    124         // 弹框请求用户授权
    125         [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
    126             if (status == PHAuthorizationStatusAuthorized) { // 用户点击了好
    127                 [self saveImage];
    128             }
    129         }];
    130     }
    131 }
    132 
    133 - (void)saveImage
    134 {
    135     // PHAsset : 一个资源, 比如一张图片一段视频
    136     // PHAssetCollection : 一个相簿
    137 
    138     // PHAsset的标识, 利用这个标识可以找到对应的PHAsset对象(图片对象)
    139     __block NSString *assetLocalIdentifier = nil;
    140 
    141     // 如果想对"相册"进行修改(增删改), 那么修改代码必须放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中
    142     [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    143         // 1.保存图片A到"相机胶卷"中
    144         // 创建图片的请求
    145         assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;
    146     } completionHandler:^(BOOL success, NSError * _Nullable error) {
    147         if (success == NO) {
    148             [self showError:@"保存图片失败!"];
    149             return;
    150         }
    151 
    152         // 2.获得相簿
    153         PHAssetCollection *createdAssetCollection = [self createdAssetCollection];
    154         if (createdAssetCollection == nil) {
    155             [self showError:@"创建相簿失败!"];
    156             return;
    157         }
    158 
    159         [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    160             // 3.添加"相机胶卷"中的图片A到"相簿"D中
    161 
    162             // 获得图片
    163             PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
    164 
    165             // 添加图片到相簿中的请求
    166             PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];
    167 
    168             // 添加图片到相簿
    169             [request addAssets:@[asset]];
    170         } completionHandler:^(BOOL success, NSError * _Nullable error) {
    171             if (success == NO) {
    172                 [self showError:@"保存图片失败!"];;
    173             } else {
    174                 [self showSuccess:@"保存图片成功!"];;
    175             }
    176         }];
    177     }];
    178 }
    179 
    180 /**
    181  *  获得相簿
    182  */
    183 - (PHAssetCollection *)createdAssetCollection
    184 {
    185     // 从已存在相簿中查找这个应用对应的相簿
    186     PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    187     for (PHAssetCollection *assetCollection in assetCollections) {
    188         if ([assetCollection.localizedTitle isEqualToString:XMGAssetCollectionTitle]) {
    189             return assetCollection;
    190         }
    191     }
    192 
    193     // 没有找到对应的相簿, 得创建新的相簿
    194 
    195     // 错误信息
    196     NSError *error = nil;
    197 
    198     // PHAssetCollection的标识, 利用这个标识可以找到对应的PHAssetCollection对象(相簿对象)
    199     __block NSString *assetCollectionLocalIdentifier = nil;
    200     [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
    201         // 创建相簿的请求
    202         assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:XMGAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
    203     } error:&error];
    204 
    205     // 如果有错误信息
    206     if (error) return nil;
    207 
    208     // 获得刚才创建的相簿
    209     return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;
    210 }
    211 
    212 - (void)showSuccess:(NSString *)text
    213 {
    214     dispatch_async(dispatch_get_main_queue(), ^{
    215         [SVProgressHUD showSuccessWithStatus:text];
    216     });
    217 }
    218 
    219 - (void)showError:(NSString *)text
    220 {
    221     dispatch_async(dispatch_get_main_queue(), ^{
    222         [SVProgressHUD showErrorWithStatus:text];
    223     });
    224 }
    225 
    226 
    227 ## Xcode插件的安装路径
    228 
    229 /Users/用户名/Library/Application Support/Developer/Shared/Xcode/Plug-ins
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  • 原文地址:https://www.cnblogs.com/mkai/p/5691733.html
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