iOS-儲存圖片到(自定義)相簿步驟
阿新 • • 發佈：2018-12-15
儲存到相簿步驟：
1.儲存圖片到【相機膠捲】
2.擁有一個【自定義相簿】
3.將剛才儲存到【相機膠捲中的圖片】引用到【自定義相簿】
①儲存圖片到【相機膠捲】
/* 一、儲存圖片到【自定義相簿】 1.儲存圖片到【相機膠捲】 1> C語言函式UIImageWriteToSavedPhotosAlbum 2> AssetsLibrary框架 3> Photos框架 2.擁有一個【自定義相簿】 1> AssetsLibrary框架 2> Photos框架 3.新增剛才儲存的圖片到【自定義相簿】 1> AssetsLibrary框架 2> Photos框架*/ - (IBAction)save:(UIButton *)sender { /* 儲存到相簿步驟： 1.儲存圖片到【相機膠捲】 2.擁有一個【自定義相簿】 3.將剛才儲存到【相機膠捲中的圖片】引用到【自定義相簿】 */ UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); } - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo { if (error) { [SVProgressHUD showErrorWithStatus:@"儲存失敗！"]; } else { [SVProgressHUD showSuccessWithStatus:@"儲存成功！"]; } }
/* //補充 錯誤資訊：-[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1] 錯誤解釋：引數越界錯誤，方法的引數個數和實際傳遞的引數個數不一致 */
Photos框架詳解和儲存圖片
1.Photos框架詳解
/* 二、Photos框架須知 1.PHAsset : 一個PHAsset物件就代表相簿中的一張圖片或者一個視訊 1> 查 : [PHAsset fetchAssets...] 2> 增刪改 : PHAssetChangeRequest(包括圖片\視訊相關的所有改動操作) 2.PHAssetCollection : 一個PHAssetCollection物件就代表一個相簿 1> 查 : [PHAssetCollection fetchAssetCollections...] 2> 增刪改 : PHAssetCollectionChangeRequest(包括相簿相關的所有改動操作) 3.對相片\相簿的任何【增刪改】操作，都必須放到以下方法的block中執行 -[PHPhotoLibrary performChanges:completionHandler:] -[PHPhotoLibrary performChangesAndWait:error:] */ /* Foundation和Core Foundation的資料型別可以互相轉換，比如NSString *和CFStringRef NSString *string = (__bridge NSString *)kCFBundleNameKey; CFStringRef string = (__bridge CFStringRef)@"test"; 獲得相機膠捲相簿 [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil] */ /* 錯誤資訊：This method can only be called from inside of -[PHPhotoLibrary performChanges:completionHandler:] or -[PHPhotoLibrary performChangesAndWait:error:]
// 非同步執行修改操作 [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{ [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image]; } completionHandler:^(BOOL success, NSError * _Nullable error) { if (error) { [SVProgressHUD showErrorWithStatus:@"儲存失敗！"]; } else { [SVProgressHUD showSuccessWithStatus:@"儲存成功！"]; } }]; // 同步執行修改操作 NSError *error = nil; [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image]; } error:&error]; if (error) { [SVProgressHUD showErrorWithStatus:@"儲存失敗！"]; } else { [SVProgressHUD showSuccessWithStatus:@"儲存成功！"]; } */
2.Photos框架儲存圖片到相機膠捲
- (IBAction)save:(UIButton *)sender { /* 儲存到相簿步驟： 1.儲存圖片到【相機膠捲】 2.擁有一個【自定義相簿】 3.將剛才儲存到【相機膠捲中的圖片】引用到【自定義相簿】 */ NSError *error = nil; // 儲存圖片到【相機膠捲】 [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image]; } error:&error]; if (error) { [SVProgressHUD showErrorWithStatus:@"儲存失敗！"]; } else { [SVProgressHUD showSuccessWithStatus:@"儲存成功！"]; } }
②擁有一個【自定義相簿】
Foundation和Core Foundation的資料型別可以互相轉換，比如NSString *和CFStringRef
NSString *string = (__bridge NSString *)kCFBundleNameKey;
CFStringRef string = (__bridge CFStringRef)@"test";
1.建立一個【自定義相簿】
/** 當前App對應的自定義相簿 */ - (PHAssetCollection *)createdCollection; - (IBAction)save:(UIButton *)sender { /* 儲存到相簿步驟： 1.儲存圖片到【相機膠捲】 2.擁有一個【自定義相簿】 3.將剛才儲存到【相機膠捲中的圖片】引用到【自定義相簿】 */ [self createdCollection]; } #pragma mark - 獲得當前App對應的自定義相簿 - (PHAssetCollection *)createdCollection { // 獲得軟體名字 NSString *title = [NSBundle mainBundle].infoDictionary[(__bridge NSString *)kCFBundleNameKey]; // 抓取所有的自定義相簿 PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; // 查詢當前App對應的自定義相簿 for (PHAssetCollection *collection in collections) { if ([collection.localizedTitle isEqualToString:title]) { return collection; } } /** 當前App對應的自定義相簿沒有被建立過 **/ // 建立一個【自定義相簿】 NSError *error = nil; __block NSString *createdCollectionID = nil; [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
createdCollectionID = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title].placeholderForCreatedAssetCollection.localIdentifier; } error:&error]; if (error) { [SVProgressHUD showErrorWithStatus:@"建立相簿失敗！"]; return nil; } // 根據唯一標識獲得剛才建立的相簿 return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject; } /* Foundation和Core Foundation的資料型別可以互相轉換，比如NSString *和CFStringRef NSString *string = (__bridge NSString *)kCFBundleNameKey; CFStringRef string = (__bridge CFStringRef)@"test"; 獲得相機膠捲相簿 [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil] */
2.獲取相簿
#pragma mark - 獲得當前App對應的自定義相簿 // 根據唯一標識獲得剛才建立的相簿 return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject;
3.儲存圖片到自定義相簿
/** 當前App對應的自定義相簿 */ - (PHAssetCollection *)createdCollection; /** 返回剛才儲存到【相機膠捲】的圖片 */ - (PHFetchResult<PHAsset *> *)createdAssets; - (IBAction)save:(UIButton *)sender { PHAuthorizationStatus oldStatus = [PHPhotoLibrary authorizationStatus]; // 請求\檢查訪問許可權 : // 如果使用者還沒有做出選擇，會自動彈框，使用者對彈框做出選擇後，才會呼叫block // 如果之前已經做過選擇，會直接執行block [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) { dispatch_async(dispatch_get_main_queue(), ^{ if (status == PHAuthorizationStatusDenied) { // 使用者拒絕當前App訪問相簿 if (oldStatus != PHAuthorizationStatusNotDetermined) { HKLog(@"提醒使用者開啟開關") } } else if (status == PHAuthorizationStatusAuthorized) { // 使用者允許當前App訪問相簿 [self saveImageIntoAlbum]; } else if (status == PHAuthorizationStatusRestricted) { // 無法訪問相簿 [SVProgressHUD showErrorWithStatus:@"因系統原因，無法訪問相簿！"]; } }); }]; } /** * 儲存圖片到相簿 */ - (void)saveImageIntoAlbum { // 獲得相片 PHFetchResult<PHAsset *> *createdAssets = self.createdAssets; if (createdAssets == nil) { [SVProgressHUD showErrorWithStatus:@"儲存圖片失敗！"]; return; } // 獲得相簿 PHAssetCollection *createdCollection = self.createdCollection; if (createdCollection == nil) { [SVProgressHUD showErrorWithStatus:@"建立或者獲取相簿失敗！"]; return; } // 新增剛才儲存的圖片到【自定義相簿】 NSError *error = nil; [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdCollection]; [request insertAssets:createdAssets atIndexes:[NSIndexSet indexSetWithIndex:0]]; } error:&error]; // 最後的判斷 if (error) { [SVProgressHUD showErrorWithStatus:@"儲存圖片失敗！"]; } else { [SVProgressHUD showSuccessWithStatus:@"儲存圖片成功！"]; } } #pragma mark - 獲得當前App對應的自定義相簿 - (PHAssetCollection *)createdCollection { // 獲得軟體名字 NSString *title = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"]; // 抓取所有的自定義相簿 PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; // 查詢當前App對應的自定義相簿 for (PHAssetCollection *collection in collections) { if ([collection.localizedTitle isEqualToString:title]) { return collection; } } /** 當前App對應的自定義相簿沒有被建立過 **/ // 建立一個【自定義相簿】 NSError *error = nil; __block NSString *createdCollectionID = nil; [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ createdCollectionID = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title].placeholderForCreatedAssetCollection.localIdentifier; } error:&error]; if (error) return nil; // 根據唯一標識獲得剛才建立的相簿 return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject; } - (PHFetchResult<PHAsset *> *)createdAssets { NSError *error = nil; __block NSString *assetID = nil; // 儲存圖片到【相機膠捲】 [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ assetID = [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier; } error:&error]; if (error) return nil; // 獲取剛才儲存的相片 return [PHAsset fetchAssetsWithLocalIdentifiers:@[assetID] options:nil]; } //補充：不帶許可權判斷 //- (IBAction)save { // NSError *error = nil; // // // 儲存圖片到【相機膠捲】 // __block PHObjectPlaceholder *placeholder = nil; // [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ // placeholder = [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset; // } error:&error]; // if (error) { // [SVProgressHUD showErrorWithStatus:@"儲存圖片失敗！"]; // return; // } // // // 獲得相簿 // PHAssetCollection *createdCollection = self.createdCollection; // if (createdCollection == nil) { // [SVProgressHUD showErrorWithStatus:@"建立相簿失敗！"]; // return; // } // // // 新增剛才儲存的圖片到【自定義相簿】 // [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{ // PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdCollection]; // [request insertAssets:@[placeholder] atIndexes:[NSIndexSet indexSetWithIndex:0]]; // } error:&error]; // // // 最後的判斷 // if (error) { // [SVProgressHUD showErrorWithStatus:@"儲存圖片失敗！"]; // } else { // [SVProgressHUD showSuccessWithStatus:@"儲存圖片成功！"]; // } //}