ios - 将 UIImage 调整为 200x200pt/px

Question

我一直在努力调整图像的大小。基本上我偶然发现: How to scale down a UIImage and make it crispy / sharp at the same time instead of blurry?

这似乎是一个合法的解决方案，但不知何故它无法正常工作。

我的应用可以处理相册中的照片。此照片的大小应调整为大约 200x200，而宽度而非高度很重要。

不幸的是，我没有示例代码，因为我对无效解决方案的愤怒而丢弃了它，抱歉。

Answer 1

这是我的代码。图片的宽度为 850 像素而不是 200 像素:

 func resizeImage(image: UIImage, newWidth: CGFloat) -> UIImage {

    let scale = newWidth / image.size.width
    let newHeight = image.size.height * scale
    UIGraphicsBeginImageContext(CGSizeMake(newWidth, newHeight))
    image.drawInRect(CGRectMake(0, 0, newWidth, newHeight))
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage
}


@IBAction func chooseImage(sender: AnyObject) {


    var myPickerController = UIImagePickerController()
    myPickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    myPickerController.delegate = self;
    self.presentViewController(myPickerController, animated: true, completion: nil)


}

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])

{
    var imagenow = info[UIImagePickerControllerOriginalImage] as? UIImage

    imageImage.image = resizeImage(imagenow!, newWidth: 200)



    pimg2 = imageImage.image!

    cidnew2 = textFieldCID!.text!
    pname2 = textFieldName!.text
    pmanu2 = textFieldMan!.text
    pnick2 = textFieldNick!.text
    podate2 = textFieldPODate!.text
    pno2 = textFieldArtNo!.text



    self.dismissViewControllerAnimated(true, completion: nil)

}