ios - Swift 将带有 subview 的 UIView 添加到 titleView

Question

我想自定义我的导航栏，并在导航栏的标题 View 中插入一个带有两个 subview 的 UIView。不幸的是， subview 没有显示。你知道为什么吗？

    let titleContainer = UIView()
    titleContainer.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)

    let searchIcon = UIButton()
    searchIcon.setImage(UIImage(named: "search_icon"), for: UIControlState.normal)
    searchIcon.layer.frame = CGRect(x: 0, y: (UIScreen.main.bounds.size.height - 28) / 2, width: 28, height: 28)
    titleContainer.addSubview(searchIcon)

    let titleLabel = UILabel()
    titleLabel.frame = CGRect(x: 28, y: UIScreen.main.bounds.size.height, width: UIScreen.main.bounds.size.width-28, height: UIScreen.main.bounds.size.height)
    titleLabel.textColor = UIColor(red:255, green:255, blue:255, alpha:1.0)
    titleContainer.addSubview(self.titleLabel)

    self.navigationItem.titleView = titleContainer

问题和预期的解决方案:

Answer 1

为什么将所有元素的高度用作UIScreen.main.bounds.size.height？请尝试以下代码。

附言我已经更改了 searchIcon 的颜色，因为我没有图像，并且更改了标签文本的颜色并添加了一些文本以使其可见。

    let titleContainer = UIView()
    titleContainer.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 45)

    let searchIcon = UIButton()
    //searchIcon.setImage(UIImage(named: "search_icon"), for: UIControlState.normal)
    searchIcon.backgroundColor = UIColor.red
    searchIcon.layer.frame = CGRect(x: 0, y: 8, width: 28, height: 28)
    titleContainer.addSubview(searchIcon)

    let titleLabel = UILabel()
    titleLabel.frame = CGRect(x: 28, y: 8, width: UIScreen.main.bounds.size.width-28, height: 30)
    titleLabel.textColor = UIColor.blue//(red:255, green:255, blue:255, alpha:1.0)
    titleContainer.addSubview(titleLabel)
    titleLabel.text = "Sample Text"

    self.navigationItem.titleView = titleContainer

以上代码截图如下:

请根据您的要求相应地更改 x,y。