如何将 PHAsset 转换为 PHLivePhoto

Question

我有PHAsset，我想获得PHLivePhoto。

PHAsset 是PHLivePhoto 的资产。

我知道这个函数。

/// Requests a Live Photo from the given resource URLs. The result handler will be called multiple times to deliver new PHLivePhoto instances with increasingly more content. If a placeholder image is provided, the result handler will first be invoked synchronously to deliver a live photo containing only the placeholder image. Subsequent invocations of the result handler will occur on the main queue.
//  The targetSize and contentMode parameters are used to resize the live photo content if needed. If targetSize is equal to CGRectZero, content will not be resized.
//  When using this method to provide content for a PHLivePhotoView, each live photo instance delivered via the result handler should be passed to -     [PHLivePhotoView setLivePhoto:].
+ (PHLivePhotoRequestID)requestLivePhotoWithResourceFileURLs:(NSArray<NSURL *> *)fileURLs placeholderImage:(UIImage *__nullable)image targetSize:(CGSize)targetSize contentMode:(PHImageContentMode)contentMode resultHandler:(void(^)(PHLivePhoto *__nullable livePhoto, NSDictionary *info))resultHandler;

但我不知道怎么用。

如何转换？

Answer 1

您可以在 PHImageManager 中使用此方法

- (PHImageRequestID)requestLivePhotoForAsset:(PHAsset *)asset targetSize:(CGSize)targetSize contentMode:(PHImageContentMode)contentMode options:(PHLivePhotoRequestOptions *)options resultHandler:(void (^)(PHLivePhoto *livePhoto, NSDictionary *info))resultHandler

在 resultHandler 中，您可以获得准备在 PHLivePhotoView 中显示的 PHLivePhoto。

示例：

[[PHImageManager defaultManager] requestLivePhotoForAsset:asset targetSize:self.contentView.frame.size contentMode:PHImageContentModeDefault options:nil resultHandler:^(PHLivePhoto * _Nullable livePhoto, NSDictionary * _Nullable info) { self.contentView.livePhoto = livePhoto  }];

Answer 2

[asset requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
PHLivePhoto *livePhoto = [contentEditingInput.livePhoto];
}];