如何单击 UITabBarItem 并显示新的 ViewController？

Posted 2023-02-23

【中文标题】如何单击 UITabBarItem 并显示新的 ViewController？

【英文标题】：How to click UITabBarItem and show new ViewController?

【发布时间】：2018-08-07 03:48:50

【问题描述】：

我手动添加标签栏来查看控制器，这不是tabBarController，因为我只想要标签栏UI，而不是标签栏功能

我想点击标签栏并显示新的ViewController，但我不能在storyBoard 中这样做

如果我使用这个方法，xcode会提示我Value of type 'UITabBarItem' has no member 'isUserInteractionEnabled'和Value of type 'UITabBarItem' has no member 'addGestureRecognizer'

如何单击 UITabBarItem？

How to make a UILabel clickable?

@IBOutlet weak var setting: UITabBarItem!
@IBOutlet weak var activity: UITabBarItem!
@IBOutlet weak var profile: UITabBarItem!
@IBOutlet weak var connect: UITabBarItem!
@IBOutlet weak var scanner: UITabBarItem!

override func viewDidLoad() 
    super.viewDidLoad()

    let tap = UITapGestureRecognizer(target: self, action: #selector(tapFunction))
    setting.isUserInteractionEnabled = true
    setting.addGestureRecognizer(tap)

    activity.isUserInteractionEnabled = true
    activity.addGestureRecognizer(tap)

    profile.isUserInteractionEnabled = true
    profile.addGestureRecognizer(tap)

    connect.isUserInteractionEnabled = true
    connect.addGestureRecognizer(tap)

    scanner.isUserInteractionEnabled = true
    scanner.addGestureRecognizer(tap)

@objc func tapFunction(sender:UITapGestureRecognizer) 

    print("tap working")

【参考方案1】：

“UITabBarItem”类型的值没有成员“isUserInteractionEnabled”，“UITabBarItem”类型的值没有成员“addGestureRecognizer”

因为UITabBarItem继承自UIBarItem，即继承自NSObject，而不是UIView

要启用/禁用UITabBarItem，您可以使用isEnabled 属性

https://developer.apple.com/documentation/uikit/uibaritem/1616418-isenabled?changes=_2

要捕捉UITabBarItem的动作，你可以在UITabBar的代理tabbar:didselectitem中捕捉它

https://developer.apple.com/documentation/uikit/uitabbardelegate/1623463-tabbar?changes=_2

并通过UITabBarItem.tag 获得项目的位置 https://developer.apple.com/documentation/uikit/uibaritem/1616419-tag?changes=_2

【讨论】：

我在didSelect打印项目标签，所有标签都是0

@CLSo : 你为 UITabbarItem 设置了标签吗？在故事板或代码中 UITabbarItem.tag = tag_index

我明白了，现在可以了