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1.導入第三方框架SVProgressHUD 和 Photos框架
#import<SVProgressHUD.h>
#import<Photos/Photos.h>
2.創建全局變量相簿的名稱
static NSString * PHAssetCollectionTitle = @"卡卡";
3.保存按鈕
- (IBAction)save {
// 判斷授權狀態
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusRestricted) {
[SVProgressHUD showErrorWithStatus:@"因為系統原因，無法訪問相冊"];
} else if (status == PHAuthorizationStatusDenied){
// 用戶拒絕當前應用訪問相冊(用戶當初點擊了"不允許")
NSLog(@"提醒用戶去[設置-隱私-照片-xxx]打開訪問開關");
} else if (status == PHAuthorizationStatusAuthorized){
//用戶允許當前應用訪問相冊? 用戶當初點擊了好
[self saveImage];
} else if (status == PHAuthorizationStatusNotDetermined){
// 用戶還沒有做出選擇
// 彈框請求用戶授權
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
[self saveImage];
}
}];
}
}
4.保存圖片
- (void)saveImage
{
// PHAsset : 一個資源, 比如一張圖片\一段視頻
// PHAssetCollection : 一個相簿
// PHAsset的標識，利用這個標識可以找到對應的PHAsset對象 即圖片對象
__block NSString *assetLocalIdentifier = nil;
// 如果想對"相冊"進行修改(增刪改), 那么修改代碼必須放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//1.保存圖片A到【相機膠卷】中
// 創建圖片的請求
assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
[self showError:@"保存圖片失敗"];
return ;
}
// 2.獲得相簿
PHAssetCollection *createdAssetCollection = [self createdAssetCollection];
if (createdAssetCollection == nil) {
[self showError:@"保存圖片失敗"];
return ;
}
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 獲得圖片
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
// 添加圖片到相簿中的請求
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];
// 添加圖片到相簿
[request addAssets:@[asset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
[self showError:@"保存圖片失敗"];
} else{
[self showSuccess:@"保存圖片成功"];
}
}];
}];
}
5.獲得相簿
- (PHAssetCollection *)createdAssetCollection{??
? PHFetchResult*assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections) {
if ([assetCollection.localizedTitle isEqualToString:PPHAssetCollectionTitle]) {
return assetCollection;
}
}
// 沒有找到對應的相簿, 得創建新的相簿
// 錯誤信息
NSError *error = nil;
// PHAssetCollection的標識，利用這個標識可以找到對應的PHAssetCollection的對象（相簿對象）
__block NSString *assetCollectionLocalIdentifier = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
// 創建相簿的請求
assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:PPHAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
} error:&error];
if (error) return nil;
// 獲得剛才創建的相簿
PHAssetCollection *assetCollection = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;
return assetCollection;
}
6.保存成功方法
- (void)showSuccess:(NSString *)text
{
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD showSuccessWithStatus:text];
});
}
7.保存失敗方法
- (void)showError:(NSString *)text
{
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD showErrorWithStatus:text];
});
}
