如何正确显示UIImageView?迅速

时间:2016-09-05 02:33:45

标签: ios swift image uiimageview scale

我的应用程序中有一个UIImageView,我试图让它显示一个宽阔的短片。我正在尝试保留原始图像的宽高比。

这是我的代码。它目前无法按我希望的方式工作:

func scaleImage(oldImage: UIImage) -> UIImage {

  // 1. Use only y=273 to y=299

  let x = 0
  let y = Int(oldImage.size.height/2)
  let width = Int(oldImage.size.width)
  let height = 150
  let cropRect = CGRect(x: y, y: x, width: height, height: width)

  let cgImage = CGImageCreateWithImageInRect(oldImage.CGImage, cropRect)

  var image = UIImage(CGImage: cgImage!, scale:oldImage.scale, orientation: oldImage.imageOrientation)

  UIImageWriteToSavedPhotosAlbum(oldImage, nil, nil, nil)
  UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)

  imageView.translatesAutoresizingMaskIntoConstraints = true

  imageView.image = image

  imageView.contentMode = UIViewContentMode.ScaleAspectFit

  imageView.frame.size.height = image.size.height
}

这是保存到相机胶卷的已编辑图像:http://i.imgur.com/3FeNCMh.png

这是UIImageView上显示的内容:http://i.imgur.com/FCgeUJD.png

如您所见,图像在两侧被切掉。我在这里缺少什么?

0 个答案:

没有答案