PHAsset 到 UIImage [英] PHAsset to UIImage

问题描述

我试图从 PHAsset 创建一个 UIImage(如缩略图或其他东西)，以便我可以将它传递给需要 UIImage 的东西.我已经尝试调整我在 SO 上找到的解决方案(因为它们都只是直接将它传递给一个 tableview 或其他东西)，但我没有成功(可能是因为我做得不对).

I'm attempting to create a UIImage (like a thumbnail or something) from a PHAsset so that I can pass it into something that takes a UIImage. I've tried adapting solutions I found on SO (since they all just directly pass it into say a tableview or something), but I have no success (likely because I'm not doing it right).

func getAssetThumbnail(asset: PHAsset) -> UIImage {
    var retimage = UIImage()
    println(retimage)
    let manager = PHImageManager.defaultManager()
    manager.requestImageForAsset(asset, targetSize: CGSize(width: 100.0, height: 100.0), contentMode: .AspectFit, options: nil, resultHandler: {(result, info)->Void in
            retimage = result
    })
    println(retimage)
    return retimage
}

println 告诉我 manager.request 行现在没有做任何事情.我如何让它将资产作为 UIImage 提供给我.

The printlns are telling me that the manager.request line isn't doing anything right now. How do I get it to give me the asset as a UIImage.

谢谢.

推荐答案

这做了我需要它做的事情，以防有人也需要它.

This did what I needed it to do, in case anyone also needs this.

func getAssetThumbnail(asset: PHAsset) -> UIImage {
    let manager = PHImageManager.defaultManager()
    let option = PHImageRequestOptions()
    var thumbnail = UIImage()
    option.synchronous = true
    manager.requestImageForAsset(asset, targetSize: CGSize(width: 100.0, height: 100.0), contentMode: .AspectFit, options: option, resultHandler: {(result, info)->Void in
            thumbnail = result!
    })
    return thumbnail
}

Swift 3 更新

func getAssetThumbnail(asset: PHAsset) -> UIImage {
    let manager = PHImageManager.default()
    let option = PHImageRequestOptions()
    var thumbnail = UIImage()
    option.isSynchronous = true
    manager.requestImage(for: asset, targetSize: CGSize(width: 100, height: 100), contentMode: .aspectFit, options: option, resultHandler: {(result, info)->Void in
        thumbnail = result!
    })
    return thumbnail
}

这篇关于PHAsset 到 UIImage的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！