自定义相册

如果直接使用系统的相册,并不会创建一个属于自己app的相册,所以我们在这里要实现自定义创建属于自己app的相册;

//直接调用系统的相册
UIImageWriteToSavedPhotosAlbum(_image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

//直接封装了一个自定义相册的方法
#import "LZPAlbumManager.h"
#import <Photos/Photos.h>
#import <SVProgressHUD/SVProgressHUD.h>
@implementation LZPAlbumManager

//获取指定的相册
//由用户传入想要找的相册的名字
+(PHAssetCollection *)getExistAlumWithAssetName:(NSString *)assetName{
    //该方法返回一个包含所有相册的数组(可以看做是一个数组,返回的类型可以遍历)
    PHFetchResult * result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    //遍历返回的数组,获得所有的相册名字
    for (PHAssetCollection * collection in result) {
        if ([collection.localizedTitle isEqualToString:assetName]) {
            return collection;
        }
    }
    return nil;
}

//保存指定的图片到指定的相册中
+(void)saveImageWithAlumAssetName:(NSString *)assetName andImageName:(UIImage *)image{
//获取相薄,因为一个系统中只有一个相薄,这里是使用的单例
    PHPhotoLibrary * phLi = [PHPhotoLibrary sharedPhotoLibrary];
    [phLi performChanges:^{

        //自定义相册
        PHAssetCollectionChangeRequest * assetCollectionChangeRequest;
        //判断自己的app专有的相册是否存在,如果存在,直接保存,如果不存在,创建一个指定名字的相册后再保存图片
        if ([self getExistAlumWithAssetName:assetName]) {
            //使用原有的相册保存
            assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:[self getExistAlumWithAssetName:assetName]];
        }else{
        //创建一个指定名称的相册
            assetCollectionChangeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:assetName];
        }
        //创建图片请求对象
        PHAssetChangeRequest * assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

        //把图片放在自定义相册中
        [assetCollectionChangeRequest addAssets:@[assetChangeRequest.placeholderForCreatedAsset ]];

    } completionHandler:^(BOOL success, NSError * _Nullable error) {

        if (!error) {
            [SVProgressHUD showSuccessWithStatus:@"保存成功"];
        }else{
            [SVProgressHUD showErrorWithStatus:@"保存失败"];
        }
    }];
}
@end