我对将UIImage转换为base64字符串有疑问。而且我已经调整了图像的宽度和高度(1024 x 768)。然后,我将此图像转换为base64字符串。但是,当我使用此base64 String到UIImage并查看图像的宽度和高度时,我之前没有调整大小(2304.0 x 3072.0)。如何正确设置我的base64字符串图像大小?
guard let image = image else { return }
print("image => \(image)")
//image => <UIImage:0x283cce7f0 anonymous {768, 1024}>
guard let base64ImageString = image.toBase64(format: .jpeg(0.2)) else { return }
let dataDecoded : Data = Data(base64Encoded: base64ImageString, options: .ignoreUnknownCharacters)!
let decodedimage = UIImage(data: dataDecoded)
let height = decodedimage?.size.height
let width = decodedimage?.size.width
print("====) \(String(describing: width)) / \(String(describing: height))")
//====) Optional(2304.0) / Optional(3072.0)
public enum ImageFormat {
case png
case jpeg(CGFloat)
}
extension UIImage {
public func toBase64(format: ImageFormat) -> String? {
var imageData: Data?
switch format {
case .png:
imageData = self.pngData()
case .jpeg(let compression):
imageData = self.jpegData(compressionQuality: compression)
}
return imageData?.base64EncodedString()
}
}
尝试这种方式,下面的代码调整图像的大小,应该在将其更改为base64之前添加它。
guard let image = image else { return }
print("image => \(image)")
//image => <UIImage:0x283cce7f0 anonymous {768, 1024}>
let desiredSize = CGSize(width: 768, height: 1024)
UIGraphicsBeginImageContextWithOptions(desiredSize, false, 1.0)
image.draw(in: CGRect(origin: CGPoint.zero, size: CGSize(width:
desiredSize.width, height: desiredSize.height)))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
guard let base64ImageString = image.toBase64(format: .jpeg(1.0)) else { return }