Question

我已经研究了2天，但我还没有找到解决这个问题的方法：

我正在从Xib加载视图，并对其应用自动布局。视图显示正确，自动布局工作正常。但是当我尝试在自动布局后获取子视图的框架时，它无法正常工作。我需要子视图的框架来制作redView圆形。

我在初始化时从Xib加载视图并将其添加为带有自动布局的子视图（我已经尝试了很多不同的东西并检查我正在做的打印是否在layoutSubviews。< / p>

class ReusableView: UIView {

    @IBOutlet weak var redView: UIView!

    var mainView: UIView?
    // MARK: - Initializers.
    override init(frame: CGRect) {
        super.init(frame: frame)
        loadXIB()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        loadXIB()
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        print ("Self subviews \(self.subviews)")
        print ("MainView frame \(mainView?.frame)")
        print ("Red View frame \(redView?.frame)")
    }

    func loadXIB() {
        guard let view = loadView(String(describing: type(of: self))) else { return }
        print ("View loaded from nib \(view.frame)")
        view.translatesAutoresizingMaskIntoConstraints = false
        view.subviews.forEach {
            $0.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        }
        addSubview(view)
        NSLayoutConstraint.activate([
            view.topAnchor.constraint(equalTo: self.topAnchor),
            view.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: self.trailingAnchor),
            view.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            ])
        mainView = view
    }

    func loadView(_ nibName: String) -> UIView? {
        if nibName.isEmpty {
            return nil
        }
        let bundle = Bundle(for: type(of: self) as AnyClass)
        let nib = UINib(nibName: nibName, bundle: bundle)
        if let view = nib.instantiate(withOwner: self, options: nil).first as? UIView {
            return view
        }
        return nil
    }
}

印刷品的结果：

View loaded from nib (0.0, 0.0, 375.0, 667.0)
Self subviews [<UIView: 0x7ff232216880; frame = (0 0; 150 150); autoresize = W+H; layer = <CALayer: 0x60800022f4e0>>]
MainView frame Optional((0.0, 0.0, 150.0, 150.0))
Red View frame Optional((0.0, 20.0, 375.0, 647.0))
MainView subviews Optional([<UIView: 0x7ff232216690; frame = (0 20; 375 647); autoresize = W+H; layer = <CALayer: 0x60800022f520>>])

正如我们所看到的，mainView已经调整大小但不是他的子视图。（然后当打印视图时它完全正常，我一直在使用更复杂的视图，但我从来没有遇到过在de UIView中获取框架的问题。）

从Xib加载视图获取自动布局后调整框架子视图的大小

0 个答案: