ios - 以编程方式创建的 UIViewController 被导航栏部分隐藏

Question

我有一个 UIViewController我以编程方式创建的子类，无需 Interface Builder。该类名为 ColorController ，因为它编辑颜色。当我将其添加到 UINavigationController 内的弹出窗口时，其内容隐藏在导航栏下方。当 ColorController 时，这种情况不会发生。是从 IB Storyboard文件中提取的。

是否有一些我必须在我的 ColorController 上重写的属性或方法告诉它在导航 Controller 中调整其边界？

现在我所做的就是创建我的根 UIView (a ColorPicker )并将其设置为 self.view在loadView() .

class ColorController: UIViewController {

    private let colorPicker: ColorPicker       

    init() {
        colorPicker = ColorPicker()
    }

    override func loadView() {
        self.view = colorPicker
    }

Answer 1

不要重写loadView，重写viewDidLoad并添加colorPicker self.view

使用 SnapKit

colorPicker.snp.makeConstraints { (make) -> Void in
    make.leading.trailing.bottom.equalTo(0)
    make.top.equalTo(self.topLayoutGuide.snp.bottom);
}

使用 iOS UIKit

colorPicker.translatesAutoresizingMaskIntoConstraints = false

var constraints = [NSLayoutConstraint(item: colorPicker, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1, constant: 0),
                           NSLayoutConstraint(item: colorPicker, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1, constant: 0),
                           NSLayoutConstraint(item: colorPicker, attribute: .trailing, relatedBy: .equal, toItem: self.view, attribute: .trailing, multiplier: 1, constant: 0)]

if #available(iOS 11.0, *) {
    constraints.append(NSLayoutConstraint(item: colorPicker, attribute: .top, relatedBy: .equal, toItem: self.view.safeAreaLayoutGuide, attribute: .top, multiplier: 1, constant: 0))
} else {
    constraints.append(NSLayoutConstraint(item: colorPicker, attribute: .top, relatedBy: .equal, toItem: self.topLayoutGuide, attribute: .bottom, multiplier: 1, constant: 0))
}
self.view.addConstraints(constraints)