选项卡栏确实选择委托方法在 ios、swift 3 中给出了先前选择的选项卡索引 [英] tab bar did select delegate methods give the previously selected tab index in ios, swift 3

问题描述

我正在尝试实时检测用户选择了哪个选项卡.例如，如果用户选择 0 th 索引，同时我想让该用户选择了 zeroth 索引选项卡.所以为此，我使用了 tabbarcontroller 委托方法，如下所示.

I'm trying to detect which tab selected by the user, realtime. as an example, if user selecte 0 th index, at the same time I want to get that user has selected the zeroth index tab. so for that , I used tabbarcontroller delegate method like below.

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {

        print("the selected index is : \(selectedIndex)")
    }

但是这显示了以前的视图控制器.作为一个例子，我认为我在 second tab 然后我选择了 first tab 然后这将索引打印为 2.so 如何获得正确的选定选项卡.希望您对此有所帮助.

but this shows the previous view controller.as an example think I'm in second tab and then I select the first tab then this prints the index as 2.so how can I get the correct selected tab. hope your help with this.

推荐答案

您可以通过从 UITabBarUITabBarItem 的索引>.试试这个

You can get index of selected UITabBarItem by getting position of that particular item from array of items in UITabBar. Try this out

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
    print("the selected index is : \(tabBar.items.index(of: item))")
}

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