UINavigationItem

• 增加了类型为UIString?的subtitle，用于设置标准模式下的导航栏的副标题。
• 增加了类型为UIString?的largeTitle与largeSubtitle属性，用于设置 prefersLargeTitles 模式下导航栏的标题与副标题。
• 增加了类型为UIView?的subtitleView与largeSubtitleView属性，用于设置标准与 prefersLargeTitles 模式下导航栏的副标题视图。

案例

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        navigationController?.navigationBar.prefersLargeTitles = true
        // iOS26新增
        navigationItem.largeTitle = "导航"
        navigationItem.largeSubtitle = "子标题"
    }
}

效果

UINavigationItem.png

UIBarButtonItem

• 增加了badge属性，用于设置角标。
• 增加了prominent样式，用于凸显。
• 增加了fixedSpace()与flexibleSpace()方法，用于调整彼此之间的间距。

案例

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .systemGreen

        let barButtonItemOne = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(handleEvent))
        let barButtonItemTwo = UIBarButtonItem(barButtonSystemItem: .bookmarks, target: self, action: #selector(handleEvent))
        let barButtonItemThree = UIBarButtonItem(barButtonSystemItem: .camera, target: self, action: #selector(handleEvent))
        let barButtonItemFour = UIBarButtonItem(barButtonSystemItem: .compose, target: self, action: #selector(handleEvent))
        // iOS26新增
        barButtonItemOne.badge = .count(10)
        // iOS26新增
        barButtonItemFour.style = .prominent
        // iOS26新增
        let fixedSpace = UIBarButtonItem.fixedSpace(20)
        let flexibleSpace = UIBarButtonItem.flexibleSpace()
        navigationItem.rightBarButtonItems = [barButtonItemOne]
        navigationController?.isToolbarHidden = false
        toolbarItems = [barButtonItemTwo, fixedSpace, barButtonItemThree, flexibleSpace, barButtonItemFour]
    }

    @objc func handleEvent(_ sender: UIBarButtonItem) {
        view.backgroundColor = .init(red: .random(in: 0 ... 1), green: .random(in: 0 ... 1), blue: .random(in: 0 ... 1), alpha: 1.0)
    }
}

效果

UIBarButtonItem.gif