以不同尺寸显示的图像视图 - Swift

Question

我在同一个 VC 的 2 个不同代码部分的视图（在 Storyboard 中创建）中以编程方式创建一些图像视图，但我得到了不同的结果。这是我的代码：

var images: Int?

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

 switch images {

    case 0:
        imagesCount = countImages.noImage

    case 1:
        imageView1 = UIImageView(frame: CGRect(x: 0, y: 0, width: Int((viewForImages.frame.width)), height: Int((viewForImages.frame.height))))
        imageView1.image = UIImage(data: imageData1!)

        viewForImages.addSubview(imageView1)


    case 2:
        for view in self.viewForImages.subviews {
            view.removeFromSuperview()
        }
        imageView1 = UIImageView(frame: CGRect(x: 0, y: 0, width: Int((viewForImages.frame.width) / 2) - 1, height: Int((viewForImages.frame.height))))
        imageView1.image = UIImage(data: imageData1!)
        viewForImages.addSubview(imageView1)

        imageView2 = UIImageView(frame: CGRect(x: Int(imageView1.frame.width) + 1, y: 0, width: Int((viewForImages.frame.width) / 2), height: Int(viewForImages.frame.height)))
        imageView2.image = UIImage(data: imageData2!)

        viewForImages.addSubview(imageView2)



    case 3:
        for view in self.viewForImages.subviews {
            view.removeFromSuperview()
        }
        imageView1 = UIImageView(frame: CGRect(x: 0, y: 0, width: Int((viewForImages.frame.width) / 2) - 1, height: Int((viewForImages.frame.height))))
        imageView1.image = UIImage(data: imageData1!)
        viewForImages.addSubview(imageView1)

        imageView2 = UIImageView(frame: CGRect(x: Int((viewForImages.frame.width) / 2) + 1, y: 0, width: Int((viewForImages.frame.width) / 2), height: Int((viewForImages.frame.height) / 2) - 1))
        imageView2.image = UIImage(data: imageData2!)

        viewForImages.addSubview(imageView2)

        imageView3 = UIImageView(frame: CGRect(x: Int((viewForImages.frame.width) / 2) + 1, y: Int(imageView2.frame.height) + 1, width: Int((viewForImages.frame.width) / 2), height: Int((viewForImages.frame.height)) / 2))
        imageView3.image = UIImage(data: imageData3!)

        viewForImages.addSubview(imageView3)

    default:
        break

    }
}

上面的代码正确显示了图像视图，但我也将这些图像保存在核心数据中，当我再次打开此视图时，然后在 viewDidLoad() 中，我添加了以下代码：

override func viewDidLoad() {
    super.viewDidLoad()
            self.imageView1 = UIImageView(frame: CGRect(x: 0, y: 0, width: Int((viewForImages.frame.width) / 2) - 1, height: Int((viewForImages.frame.height))))

            if let data = entry.imageData1 {
                self.imageView1.image = UIImage(data: data)
            }
            viewForImages.addSubview(imageView1)

            self.imageView2 = UIImageView(frame: CGRect(x: Int((viewForImages.frame.width) / 2) + 1, y: 0, width: Int((viewForImages.frame.width) / 2), height: Int((viewForImages.frame.height) / 2) - 1))

            if let data = entry.imageData2 {
                self.imageView2.image = UIImage(data: data)
            }
            viewForImages.addSubview(imageView2)

           self.imageView3 = UIImageView(frame: CGRect(x: Int((viewForImages.frame.width) / 2) + 1, y: Int(imageView2.frame.height) + 1, width: Int((viewForImages.frame.width) / 2), height: Int((viewForImages.frame.height)) / 2))
            if let data = entry.imageData3 {
                self.imageView3.image = UIImage(data: data)
            }
            viewForImages.addSubview(imageView3)
}

因此，每当 VC 加载时，图像如下所示：

注意：viewForImages 是我使用 Storyboard 创建的视图，entry 是一个具有 3 个属性的实体：二进制数据 (NSData) 类型的图像 Data1、2、3。现在当这个视图出现时，如果视图已经有图像，它会运行上面的代码，但是首先 imageView1 覆盖了大约 80% 的视图，而其他 2 个图像视图很少出现。为什么会这样？

Answer 1

尝试改变内容模式

imageView.contentMode = .ScaleAspectFill

Answer 2

好的，我明白了。

在 viewDiDLoad() 方法中，在 switch 语句之前，我添加了以下行，现在可以使用了。

self.viewForImages.layoutIfNeeded()

以不同尺寸显示的图像视图 - Swift

Image Views showing in different sizes - Swift

core-data

uiimageview

uiimagepickercontroller

ios

swift