Question

我使用旧方法将UIView注入到UIViewController中，但是升级到iOS 12后，它将无法正常工作，错误是： libc++abi.dylib: terminating with uncaught exception of type NSException

这是代码

class SlideOutMenu: UIViewController {
    var contentView:UIView!

    func setContentViewIn(view: UIView) {
        self.contentView = view
        self.view.addSubview(self.contentView)
    }
}

然后

class MainController: UIViewController {
    var slide = SlideOutMenu()
    var viewToAdd = ViewToAdd() // extends UIView
    override func viewDidLoad()
    {
        super.viewDidLoad()
        slide.setContentViewIn(viewToAdd)
    }
}

它不起作用，但是如果我这样声明，它就会起作用

class SlideOutMenu: UIViewController {
    var contentView:UIView!
    convenience init(childView: UIView) {
        self.init(nibName:nil, bundle:nil)
        self.contentView = childView
    }

    override func viewDidLoad() {
        view.addSubview(self.contentView)
    }
}

并使用

SlideOutMenu(childView: UIView())

有效。

但是这样，事实并非如此。太奇怪了

SlideOutMenu(childView: viewToAdd)

Answer 1

此在iOS 12中运行的以下代码已选中* 导入UIKit

ViewController类：UIViewController {

var view1 : UIView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    view1 = UIView.init(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    view1.center = self.view.center
    view1.backgroundColor = .red
    self.view.addSubview(self.view1)
}

} *

Answer 2

以下是我如何以编程方式构建视图的示例：

class InformationController: UIViewController {

    let labelDescription: UILabel = {
        let label = UILabel()

        label.text = "Label Name"
        // this is important for auto layout to work
        label.translatesAutoresizingMaskIntoConstraints = false

        return label
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        setupView()
    }

    private func setupView() {
        // add the view
        view.addSubview(labelDescription)

        // set the auto layout and enable the constraints
        labelDescription.topAnchor.constraint(equalTo: view.topAnchor, constant: 20).isActive = true
        labelDescription.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 10).isActive = true
        labelDescription.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
        labelDescription.heightAnchor.constraint(equalToConstant: 25).isActive = true
    }
}

iOS 12：如何以编程方式将UIView添加到UIViewController？

2 个答案: