如何调整 UIImageView 的大小(swift) [英] How to resize an UIImageView (swift)

问题描述

我是 swift 的初学者，我无法调整 UIImageView 的大小.

I'm a beginner with swift and I can't get the resize of a UIImageView working.

这是我目前的布局:

我想要的是调整图像的大小以占据屏幕宽度的一半(每行 2 张图像).

What I want is to resize the images to occupy half the screen's width (2 images per row).

这是我的故事板:

这是在我的控制器中绘制集合视图的函数:

Here is the function drawing the collection view inside my controller :

func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! {
        var cell : MenuInspirationCellView = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as MenuInspirationCellView

        cell.imageView.layer.borderWidth = 2
        cell.imageView.layer.borderColor = UIColor.yellowColor().CGColor

        //This is my first approach trying to modify the frame :
        cell.imageView.frame = CGRectMake(0,0, self.view.bounds.width / 2,v120)
        var cellImage : UIImage = UIImage(data: NSData(contentsOfURL: NSURL(string:              images[indexPath.row]))) 
        cell.imageView.image = cellImage;

        //This is my second approach (based on http://www.snip2code.com/Snippet/89236/Resize-Image-in-iOS-Swift) :


        // to resize an image to dimension 52x52
        //var newSize:CGSize = CGSize(width: 52,height: 52)
        //let rect = CGRectMake(0,0, newSize.width, newSize.height)
        //UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
        // image is a variable of type UIImage
        //cellImage.drawInRect(rect)
        //let newImage = UIGraphicsGetImageFromCurrentImageContext()
        //UIGraphicsEndImageContext()
        // resized image is stored in constant newImage
        //cell.imageView.image = newImage;


        //This is my thrid approach (based on https://gist.github.com/hcatlin/180e81cd961573e3c54d, of course i added his functions but I don't show them here for the sake of readability) :
         //cell.imageView.image = self.RBSquareImageTo(cellImage, size: CGSize(width: 80, height: 80))

        return cell
    }

有什么线索可以解决这个问题吗?

Any leads to sort this out ?

推荐答案

你的单元格的大小由你的 UICollectionViewLayout 对象决定，在你的情况下它是一个 UICollectionViewFlowLayout.如果您希望所有单元格的大小相同，则可以在布局本身上配置属性；itemSize 和 minimumInterimSpacing 可以解决问题.或者，如果您希望您的单元格具有不同的大小，例如根据每个包含的图像或其他内容，您需要您的集合视图委托来实现 UICollectionViewDelegateFlowLayout 方法:

The sizes of your cells are decided by your UICollectionViewLayout object, which is a UICollectionViewFlowLayout in your case. If you want all of your cells to be the same size, you can configure the properties on the layout itself; itemSize and minimumInterimSpacing will do the trick. Alternatively, if you want your cells to be different sizes, say depending on the image each contains or whatever, you needs your collection view delegate to implement the UICollectionViewDelegateFlowLayout method:

optional func collectionView(collectionView: UICollectionView!, layout collectionViewLayout: UICollectionViewLayout!, sizeForItemAtIndexPath indexPath: NSIndexPath!) -> CGSize

为每个单元格返回您想要的大小.

returning the size you want for each cell.

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