我正在使用Photos框架,并创建了一个应用程序,将在图片上应用过滤器。现在,我想在图像上添加文本而不是应用过滤器。此API为我提供了一个
如何使用现有的
CIImage
,我可以使用它来创建输出CIImage
。我只是不知道如何将文本添加到CIImage
的特定位置。如果我没错的话,由于性能下降,不建议将其转换为CGImage
然后添加文本。如何使用现有的
CIImage
在特定位置输出完全相同的CIImage
(保留原始图像质量)并在顶部放置文本?//Get full image
let url = contentEditingInput.fullSizeImageURL
let orientation = contentEditingInput.fullSizeImageOrientation
var inputImage = CIImage(contentsOfURL: url)
inputImage = inputImage.imageByApplyingOrientation(orientation)
//TODO: REPLACE WITH TEXT OVERLAY
/*//Add filter
let filterName = "CISepiaTone"
let filter = CIFilter(name: filterName)
filter.setDefaults()
filter.setValue(inputImage, forKey: kCIInputImageKey)
let outputImage: CIImage = filter.outputImage*/
//Create editing output
let jpegData: NSData = self.jpegRepresentationOfImage(outputImage)
let adjustmentData = PHAdjustmentData(formatIdentifier: AdjustmentFormatIdentifier, formatVersion: "1.0", data: filterName.dataUsingEncoding(NSUTF8StringEncoding))
let contentEditingOutput = PHContentEditingOutput(contentEditingInput: contentEditingInput)
jpegData.writeToURL(contentEditingOutput.renderedContentURL, atomically: true)
contentEditingOutput.adjustmentData = adjustmentData
PHPhotoLibrary.sharedPhotoLibrary().performChanges({ () -> Void in
let request = PHAssetChangeRequest(forAsset: asset)
request.contentEditingOutput = contentEditingOutput
}, completionHandler: { (success: Bool, error: NSError!) -> Void in
if !success {
NSLog("Error saving image: %@", error)
}
})