Question

我在ViewController tableView中有标识符“Cell”。这是我的代码：

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell

    var url = NSURL(string: postCover[indexPath.row])
    let data = NSData(contentsOfURL: url!) //make sure your image in this url does exist, otherwise unwrap in a if let check

    cell.imageView?.contentMode = .ScaleAspectFit
    cell.imageView?.clipsToBounds = true

    cell.imageView?.image = UIImage(data: data!)
    cell.textLabel?.text = postTitle[indexPath.row]

    cell.imageView?.layer.cornerRadius =  20
    cell.imageView?.layer.masksToBounds = true;

    return cell
}

所以，cornerRadius有效，但其中一个问题是单元格（cell.imageView?.image）高度中的图像等于行高，我既不能改变高度，也不能改变这个单元格图像的宽度

当我尝试

时

cell.imageView?.frame.size.width = 100

没有什么变化。谁知道，问题是什么？

由于我无法控制图像的高度和宽度，因此我得到带有边框半径的结果矩形，但我想要一个正方形（w：100，h：100）。

Answer 1

您可以使用此扩展程序裁剪图像的最长边并返回平方UIImage：

extension UIImage {
    var squared: UIImage {
        let square = size.width < size.height ? CGSize(width: size.width, height: size.width) : CGSize(width: size.height, height: size.height)
        let imageView = UIImageView(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: square))
        imageView.contentMode = UIViewContentMode.ScaleAspectFill
        imageView.image = self
        UIGraphicsBeginImageContext(imageView.bounds.size)
        imageView.layer.renderInContext(UIGraphicsGetCurrentContext())
        let result = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return result
    }
    var circle: UIImage {
        let square = size.width < size.height ? CGSize(width: size.width, height: size.width) : CGSize(width: size.height, height: size.height)
        let imageView = UIImageView(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: square))
        imageView.contentMode = UIViewContentMode.ScaleAspectFill
        imageView.image = self
        imageView.layer.cornerRadius = square.width/2
        imageView.layer.masksToBounds = true
        UIGraphicsBeginImageContext(imageView.bounds.size)
        imageView.layer.renderInContext(UIGraphicsGetCurrentContext())
        let result = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return result
    }
    func resizeToWidth(width:Int)-> UIImage {
        let imageView = UIImageView(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: CGSize(width: CGFloat(width), height: CGFloat(ceil(CGFloat(width)/size.width * size.height)))))
        imageView.contentMode = UIViewContentMode.ScaleAspectFit
        imageView.image = self
        UIGraphicsBeginImageContext(imageView.bounds.size)
        imageView.layer.renderInContext(UIGraphicsGetCurrentContext())
        let result = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return result
    }

}

Answer 2

您无法单独更改框架宽度或高度。你必须设置完整的框架。在Objective C中它就像是

cell.imageView.frame = CGRectMake(cell.imageView.frame.origin.x, cell.imageView.frame.origin.y, 100, 100);

Answer 3

您无法更改任何视图的frame属性的属性。你必须提供一个全新的框架。

cell.imageView?.frame.size.width = 100 //wont work

尝试这样做 -

let rect = cell.imageView?.frame;

rect.size.width = 100;

cell.imageView?.frame = rect; //this will work

单元格imageView中的圆形图像以及如何调整大小？

3 个答案: