Photos(PHAssetChangeRequest)

最新推荐文章于 2020-10-22 17:22:01 发布

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最新推荐文章于 2020-10-22 17:22:01 发布

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分类专栏： Photos

本文链接：https://blog.youkuaiyun.com/y550918116j/article/details/50477048

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本文详细介绍如何使用Photos框架在iOS应用中创建、删除、修改照片及视频，并提供了实用代码示例，如收藏功能实现。

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Photos(PHAssetChangeRequest)

Photos(PHAssetCreationRequest)

Photos(PHAssetCollectionChangeRequest)

Photos(PHCollectionListChangeRequest)

PHAssetChangeRequest主要用于创建、删除或修改PHAsset对象。可以理解为它是沟通用户照片库中照片或视频的桥梁。

1 Adding New Assets

/// 通过UIImage创建PHAsset
///
/// - parameter image : UIImage
///
/// - returns: PHAssetChangeRequest
public class func creationRequestForAssetFromImage(image: UIImage) -> Self

/// 通过照片路径创建PHAsset
///
/// - parameter fileURL : NSURL照片地址
///
/// - returns: PHAssetChangeRequest
public class func creationRequestForAssetFromImageAtFileURL(fileURL: NSURL) -> Self?

/// 通过视频路径创建PHAsset
///
/// - parameter fileURL : NSURL视频地址
///
/// - returns: PHAssetChangeRequest
public class func creationRequestForAssetFromVideoAtFileURL(fileURL: NSURL) -> Self?

/// 创建的PHAsset对象
public var placeholderForCreatedAsset: PHObjectPlaceholder? { get }

2 Deleting Assets

/// 删除PHAsset
///
/// - parameter assets: NSFastEnumeration即[PHAsset]
///
/// - returns: void
public class func deleteAssets(assets: NSFastEnumeration)

3 Modifying Assets

/// 通过PHAsset初始化PHAssetChangeRequest
public convenience init(forAsset asset: PHAsset)

/// 创建时间
public var creationDate: NSDate?
/// 位置
public var location: CLLocation?
/// 是否收藏
public var favorite: Bool

/// 是否隐藏
public var hidden: Bool

4 Editing Asset Content

/// 修改内容
public var contentEditingOutput: PHContentEditingOutput?
/// 回归到初始状态
public func revertAssetContentToOriginal()

5 实战演练

下面演示用户收藏照片或视频的源代码

func toggleFavoriteForAsset(asset: PHAsset) {
    PHPhotoLibrary.sharedPhotoLibrary().performChanges({
        // Create a change request from the asset to be modified.
        let request = PHAssetChangeRequest(forAsset: asset)
        // Set a property of the request to change the asset itself.
        request.favorite = !asset.favorite

        }, completionHandler: { success, error in
            NSLog("Finished updating asset. %@", (success ? "Success." : error))
    })
}