在 swift 中将 UIImage 降级到 1MB

Question

UIImageJPEGRepresentation是降级图像的伟大功能。

我只是在寻找将图像降级到1MB。

是的，有一种循环方式，我们可以应用多个检查，直到我们收到 1024KB 的数据计数。

let image = UIImage(named: "test")!
if let imageData = UIImagePNGRepresentation(image) {
let kb = imageData.count / 1024
if kb > 1024 {
let compressedData =  UIImageJPEGRepresentation(image, 0.2)!
}
}

请问有什么优雅的解决方案吗？

Answer 1

您可以创建一个函数

func resize(image:UIImage) -> Data? {
if let imageData = UIImagePNGRepresentation(image){ //if there is an image start the checks and possible compression
let size = imageData.count / 1024
if size > 1024 { //if the image data size is > 1024
let compressionValue = CGFloat(1024 / size) //get the compression value needed in order to bring the image down to 1024
return UIImageJPEGRepresentation(image, compressionValue) //return the compressed image data
}
else{ //if your image <= 1024 nothing needs to be done and return it as is
return imageData
}
}
else{ //if it cant get image data return nothing
return nil
}
}