我正在寻找解决方案如何显示保存在照片库中的图像的缩略图。我知道有缩略图的方法但结果太小(并且对于相反的fullScreen尺寸太大)。我想设置我想要的缩略图的自定义大小。我试图寻找任何解决方案,但我认为这太复杂了。现在我有这些显示拇指的方法:
func setFromAlbum(album:ALAssetsGroup) {
//self.imageView.image = UIImage(CGImage:album.posterImage().takeUnretainedValue())
album.enumerateAssetsWithOptions(NSEnumerationOptions.Reverse, usingBlock: {
(asset: ALAsset!, index: Int, stop: UnsafeMutablePointer<ObjCBool>) -> Void in
if ((asset) != nil) // first non-nil element will be the recent asset
{
var assetRep: ALAssetRepresentation = asset.defaultRepresentation()
self.imageView.image = UIImage(CGImage: assetRep.fullScreenImage().takeUnretainedValue())
stop.initialize(true)
}
})
}
这是显示照片的缩略图:
func setFromAsset(asset:ALAsset) {
let assetRep: ALAssetRepresentation = asset.defaultRepresentation()
let image = UIImage(CGImage: assetRep.fullScreenImage().takeUnretainedValue())
self.photoImageView.image = image
}
我试过这个但没有成功:
func setFromAsset(asset:ALAsset) {
let imageOptions:[NSObject: AnyObject] = [
kCGImageSourceThumbnailMaxPixelSize : 20
]
let assetRep: ALAssetRepresentation = asset.defaultRepresentation()
let imageRef = assetRep.CGImageWithOptions(imageOptions).takeUnretainedValue()
let image = UIImage(CGImage: imageRef)
self.photoImageView.image = image
}
我在字典中尝试了更多具有不同值的键,但无法正常工作。我发现也许方法CGImageSourceCreateThumbnailAtIndex
可以帮助我,但是例子只是在Objective C中,对我来说太过分了。
有人可以帮助我如何使用ALAssets创建自定义大小的缩略图?表现出色,表现出色。感谢
答案 0 :(得分:0)
let objAlAsset = arrayImages.objectAtIndex(0) as! ALAsset
var image = UIImage(CGImage:objAlAsset.aspectRatioThumbnail().takeUnretainedValue())
let imgData = UIImageJPEGRepresentation(image, 1.0)