iOS9，ALAssetsLibrary存储视频代码过期，使用新的PHPhotoLibrary存储视频

这里不对视频的录制进行过多的阐述，发现ALAssetsLibrary存储视频代码在iOS9过期的弟兄们应该都已经做到了用ALAssetsLibrary存储视频这一块了，下面直接将贴iOS9之前使用的ALAssetsLibrary存储视频代码块替换成使用新的PHPhotoLibrary存储视频的代码块。

首先我们看ALAssetsLibrary存储视频的代码：

        ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];

        __weaktypeof(self) weakSelf =self;

        [lib writeVideoAtPathToSavedPhotosAlbum:self.videoURL completionBlock:^(NSURL *assetURL, NSError *error) {

            if (weakSelf.shootSuccessBlock)

            {

                weakSelf.shootSuccessBlock(weakSelf.videoURL, image);

            }

            

        }];

上面可以看出，原来实现视频存储到本地的代码非常之少。

PHPhotoLibrary存储视频前提一定要获取相册权限，否则写入视频会崩溃：

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

NSString *appName = [infoDictionary objectForKey:@"CFBundleDisplayName"];
NSString *message = [NSString stringWithFormat:@"请在iPhone的\"设置-隐私-相机\"选项中，允许%@访问你的相机", appName];

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:message preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[weakSelf dismissViewControllerAnimated:YES completion:nil];
}];

UIAlertAction *setAction = [UIAlertAction actionWithTitle:@"系统设置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
if ([[UIApplication sharedApplication] canOpenURL:url])
{
[[UIApplication sharedApplication] openURL:url];
}
}];

[alertController addAction:okAction];
[alertController addAction:setAction];

[self presentViewController:alertController animated:YES completion:nil];

接下来贴PHPhotoLibrary存储视频的代码块：

__weak typeof(self) weakSelf = self;
PHPhotoLibrary *library = [PHPhotoLibrary sharedPhotoLibrary];
dispatch_async(dispatch_get_main_queue(), ^{

NSError *error = nil;
__block NSString *assetId = nil;
__block NSString *assetCollectionId = nil;

// 保存视频到【Camera Roll】(相机胶卷)
[library performChangesAndWait:^{

assetId = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:weakSelf.videoURL].placeholderForCreatedAsset.localIdentifier;

} error:&error];

NSLog(@"error1: %@", error);

// 获取曾经创建过的自定义视频相册名字
PHAssetCollection *createdAssetCollection = nil;
PHFetchResult <PHAssetCollection*> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections)
{
if ([assetCollection.localizedTitle isEqualToString:AssetCollectionName])
{
createdAssetCollection = assetCollection;
break;
}
}

//如果这个自定义框架没有创建过
if (createdAssetCollection == nil)
{
//创建新的[自定义的 Album](相簿\相册)
[library performChangesAndWait:^{

assetCollectionId = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:AssetCollectionName].placeholderForCreatedAssetCollection.localIdentifier;


} error:&error];

NSLog(@"error2: %@", error);

//抓取刚创建完的视频相册对象
createdAssetCollection = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionId] options:nil].firstObject;
}

// 将【Camera Roll】(相机胶卷)的视频 添加到【自定义Album】(相簿\相册)中
[library performChangesAndWait:^{
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];

[request addAssets:[PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil]];

} error:&error];
NSLog(@"error3: %@", error);

// 提示信息
if (self.shootCompletionBlock)
{
if (error)
{
NSLog(@"保存视频失败!");
self.shootCompletionBlock(nil, nil, error);
}
else
{
NSLog(@"保存视频成功!");

self.shootCompletionBlock(weakSelf.videoURL, image, nil);
}
}

});

这里排版好难= =，总之大家把代码复制到项目里面，只要把video的url换了，再运行一下，你就知道什么回事了

更多内容请看我的高仿微信的拍照录制视频博客