ios - 在新 Controller 标题中传递了 UIButton AttributeTitle

Question

我想问一下如何将 UIButton 中的 attributeTitle 传递到新的 Controller 导航标题中。我有 3 个按钮，设置准确，这是我的代码。

let fiqhButton: UIButton = {
    let button = UIButton(type: .system)
    let attributeText = NSAttributedString(string: "Fiqh", attributes: [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 60), NSAttributedString.Key.foregroundColor: UIColor.white])
    button.setAttributedTitle(attributeText, for: .normal)
    button.setTitleColor(.white, for: .normal)
    button.setBackgroundImage(#imageLiteral(resourceName: "milada-vigerova-36934-unsplash").withRenderingMode(.alwaysOriginal), for: .normal)
    button.clipsToBounds = true
    button.tag = 1
    button.addTarget(self, action: #selector(handlePushVC), for: .touchUpInside)
    return button
}()

这是我的 handlePushVC

@objc fileprivate func handlePushVC() {
    let layout = UICollectionViewFlowLayout()
    let searchVideoController = SearchVideoController(collectionViewLayout: layout)
    navigationController?.pushViewController(searchVideoController, animated: true)
}

谢谢

Answer 1

您可以从您的 handlePushVC 获取按钮功能，或简单地通过调用 self.fightButton .如果你想做第一个选项，你可以像这样改变你的目标:

button.addTarget(self, action: #selector(self.handlePushVC(_:)), for: .touchUpInside)

然后在您的函数中，您可以获得发送者/按钮的属性标题，并将其传递给您的 Controller 以进行推送:

@objc func handlePushVC(_ button: UIButton) {
    let layout = UICollectionViewFlowLayout()
    let searchVideoController = SearchVideoController(collectionViewLayout: layout)
    searchVideoController.title = button.attributedTitle(for: .normal)
    navigationController?.pushViewController(searchVideoController, animated: true)
}

如您所见，我们正在传递 button.attributedTitle(for: .normal) , 所以你需要做一个可选属性 NSAttributedString?那里。

最后，在您的 SearchVideoController 中的 viewDidLoad() ，您使用这个简短的函数将该变量分配给您的导航标题:

/// Sets the title with attributed string
public func setAttributedTitle(_ title: String, color: UIColor, font: UIFont) {

    let titleLabel = UILabel()
    let attributes = [NSAttributedString.Key.foregroundColor: color,
                      NSAttributedString.Key.font : font as Any]
    titleLabel.attributedText = NSAttributedString(string: title, attributes: attributes)
    titleLabel.sizeToFit()
    self.navigationItem.titleView = titleLabel
}

希望对您有所帮助!