AsyncTextAttachment并不能很好的支持UILabel, 将Demo中的UITextView替换成UILabel, 无法显示图片,

[lixiang1994]

UILabel:

UITextView:

[lixiang1994]

[bohdan-ios]

"UILabel uses an internal NSLayoutManager for laying out the text and drawing it. Unfortunately Apple does not provide a property for us to access or customize it." Source

I use a trick reload attributedText after the attachment has been loaded:

extension UILabel {

    func reloadAttributedText() {
        let attr = attributedText
        attributedText = nil
        attributedText = attr
    }
}

Hope it helps!

[midhunmgopal]

Hi @Bochbo,
could you please explain a little more about how this reloadAttributedText() method got called?
I am also facing a situation where the image is downloading but it is not reflecting on the UI.

[bohdan-ios]

Hello, @midhunmgopal

Call reloadAttributedText() after the delegate method textAttachmentDidLoadImage called.
See the code example below.

Code example

class ViewController: UIViewController {

    private let label = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .black
        configureLabel()

        let imageURL = "https://shorturl.at/GNV01"
        let attributedString = NSMutableAttributedString(imageURL: imageURL, delegate: self)
        label.attributedText = attributedString
    }

    private func configureLabel() {
        view.addSubview(label)
        label.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            label.topAnchor.constraint(equalTo: view.topAnchor, constant: 16),
            label.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
            label.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -16),
            label.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
        ])
    }
}

extension ViewController: AsyncTextAttachmentDelegate {

    func textAttachmentDidLoadImage(textAttachment: AsyncTextAttachment,
                                    displaySizeChanged: Bool) {
        label.reloadAttributedText()
    }
}

extension UILabel {

    func reloadAttributedText() {
        let attr = attributedText
        attributedText = nil
        attributedText = attr
    }
}

[midhunmgopal]

Thank you so much @Bochbo ...
It worked !!