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ios 用户相册

news 来源：原创 2024/5/2 4:04:22

  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