let image = UIImage()
//获取图片过程省略
let rect = CGRect(x: 50, y: 50, width: 50, height: 50)
let cgImageCorpped = image.cgImage?.cropping(to: rect)
let imageCorpped = UIImage(cgImage: cgImageCorpped!)
let image = UIImage()
//获取图片过程省略
let rect = CGRect(x: 50, y: 50, width: 50, height: 50)
let cgImageCorpped = image.cgImage?.cropping(to: rect)
let imageCorpped = UIImage(cgImage: cgImageCorpped!)