作品链接：http://www.jianshu.com/users/1e0f5e6f73f6/top_articles
1.导入第三方框架SVProgressHUD 和 Photos框架
#import<SVProgressHUD.h>
#import<Photos/Photos.h>
2.创建全局变量相簿的名称
static NSString * PHAssetCollectionTitle = @"卡卡";
3.保存按钮
- (IBAction)save {
// 判断授权状态
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusRestricted) {
[SVProgressHUD showErrorWithStatus:@"因为系统原因，无法访问相册"];
} 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")
NSLog(@"提醒用户去[设置-隐私-照片-xxx]打开访问开关");
} else if (status == PHAuthorizationStatusAuthorized){
//用户允许当前应用访问相册 用户当初点击了好
[self saveImage];
} else if (status == PHAuthorizationStatusNotDetermined){
// 用户还没有做出选择
// 弹框请求用户授权
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
[self saveImage];
}
}];
}
}
4.保存图片
- (void)saveImage
{
// PHAsset : 一个资源, 比如一张图片\一段视频
// PHAssetCollection : 一个相簿
// PHAsset的标识，利用这个标识可以找到对应的PHAsset对象 即图片对象
__block NSString *assetLocalIdentifier = nil;
// 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
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//1.保存图片A到【相机胶卷】中
// 创建图片的请求
assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
[self showError:@"保存图片失败"];
return ;
}
// 2.获得相簿
PHAssetCollection *createdAssetCollection = [self createdAssetCollection];
if (createdAssetCollection == nil) {
[self showError:@"保存图片失败"];
return ;
}
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 获得图片
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
// 添加图片到相簿中的请求
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];
// 添加图片到相簿
[request addAssets:@[asset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
[self showError:@"保存图片失败"];
} else{
[self showSuccess:@"保存图片成功"];
}
}];
}];
}
5.获得相簿
- (PHAssetCollection *)createdAssetCollection{
PHFetchResult*assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections) {
if ([assetCollection.localizedTitle isEqualToString:PPHAssetCollectionTitle]) {
return assetCollection;
}
}
// 没有找到对应的相簿, 得创建新的相簿
// 错误信息
NSError *error = nil;
// PHAssetCollection的标识，利用这个标识可以找到对应的PHAssetCollection的对象（相簿对象）
__block NSString *assetCollectionLocalIdentifier = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
// 创建相簿的请求
assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:PPHAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
} error:&error];
if (error) return nil;
// 获得刚才创建的相簿
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.保存失败方法
- (void)showError:(NSString *)text
{
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD showErrorWithStatus:text];
});
}
