问题描述
我想在顶部的选项卡视图中显示每个视图的标题,并使文本保持左对齐,当前,当我在情节提要中切换顶部标题栏时,我会得到以下信息:
但是当我运行我的应用程序时,标题不是这样显示的,当应用程序运行时该如何显示呢?
更新1:
我可以通过将tabview控制器嵌入Navigationview控制器中来显示标题栏。现在,我唯一的问题是将标题的对齐方式设置为左对齐。
解决方法
尝试一下:
navigationItem.largeTitleDisplayMode = .always
navigationController?.navigationBar.prefersLargeTitles = true
,
我为UINavigationItem
写了一个自定义扩展名,将标题设置为左对齐:
extension UINavigationItem {
// MARK: Use this Method for setting up title for Any Controller *ALWAYS*
public func setTitle(_ title: String,leftInset: CGFloat = -5) {
let label = UILabel()
label.text = title
label.textAlignment = .left
let customView = UIView()
customView.translatesAutoresizingMaskIntoConstraints = false
label.translatesAutoresizingMaskIntoConstraints = false
customView.backgroundColor = .clear
label.textAlignment = .left
customView.frame = CGRect(x: 0,y: 0,width: UIScreen.main.bounds.width,height: 0)
if #available(iOS 12,*) {
label.frame.origin = CGPoint(x: leftInset + 3,y: -13)
} else {
label.frame.origin = CGPoint(x: leftInset,y: -13)
}
customView.addSubview(label)
customView.layoutIfNeeded()
customView.sizeToFit()
label.layoutIfNeeded()
label.sizeToFit()
customView.translatesAutoresizingMaskIntoConstraints = true
label.translatesAutoresizingMaskIntoConstraints = true
titleView = customView
}
}
在选项卡视图中使用的每个UIViewController
中添加它:
override func viewWillAppear(_ animated: Bool) {
tabBarController?.navigationItem.setTitle("Sample",leftInset: 12)
}
必须将tabviewcontroller嵌入到navigationviewcontroller内,才能正常工作。