1.在公司的项目中，图片选择的时候需要自己定义一个图片选择器，自己根据PhotoKit写了一个Demo，也顺便学习了一下PhotoKit，自己扩展了一下，既能选择图片也能选择视频。
1.1 图片选择，如下图:
IMG_2052.PNG
1.2 获取相册，如下图:
IMG_2053.PNG
1.3 视频选择，如下图:
IMG_2054.PNG
2.相册和媒体的获取代码主要在ZCPhotoManager这个类里面，接下来可能写一篇关于PhotoKit介绍的博客。
2.1 获取相册
- (NSMutableArray *)showAlbums {
PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
PHFetchResult *topLevelUserCollections = [PHCollectionList fetchTopLevelUserCollectionsWithOptions:nil];
self.fetchResults = @[smartAlbums, topLevelUserCollections];
NSMutableArray *albums = [NSMutableArray array];
for (PHFetchResult *fetchResult in self.fetchResults)
{
for (PHCollection *collection in fetchResult) {
if ([collection isKindOfClass:[PHAssetCollection class]])
{
PHAssetCollection *assetCollection = (PHAssetCollection *)collection;
PHFetchResult *assets = [self assetsInAssetCollection:assetCollection];
if (assets.count > 0) {
if (assetCollection.assetCollectionSubtype == PHAssetCollectionSubtypeSmartAlbumUserLibrary) {
[albums insertObject:assetCollection atIndex:0];
} else {
[albums addObject:assetCollection];
}
}
}
}
}
return albums;
}
2.2 获取相册中的媒体
- (PHFetchResult *)assetsInAssetCollection:(PHAssetCollection *)album{
PHFetchOptions *options = [[PHFetchOptions alloc] init];
options.predicate = [NSPredicate predicateWithFormat:@"mediaType in %@", self.mediaTypes];
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
return [PHAsset fetchAssetsInAssetCollection:(PHAssetCollection *)album options:options];
}
