Question

我在同一VC中的2个不同代码部分的视图（在Storyboard中创建）中以编程方式创建了一些图像视图，但是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

    }
}

上面的代码正确地显示了图像视图，但我也将这些图像保存在Core Data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：图像Data1,2,3，类型为Binary Data（NSData）。现在，当此视图出现时，如果视图已经有图像，它将运行上面的代码，但第一个imageView1覆盖了大约80％的视图，而其他2个图像视图很少出现。为什么这样？

Answer 1

尝试更改内容模式

imageView.contentMode = .ScaleAspectFill

Answer 2

Ok, so I got it figured out.

In viewDiDLoad() method, before the switch statement, I added the following line and it now works.

self.viewForImages.layoutIfNeeded()

图像视图显示不同的大小 - 斯威夫特

2 个答案: