带UIAlertAction的增量标签栏标记是否快捷？

您可以尝试访问badgevalue并将其转换为Integer，如下所示：

迅捷2

if let badgevalue = tabBarController?.tabBar.items?[1].badgevalue,    nextValue = Int(badgevalue)?.successor() {    tabBarController?.tabBar.items?[1].badgevalue = String(nextValue)} else {    tabBarController?.tabBar.items?[1].badgevalue = "1"}

Swift 3或更高版本

    if let badgevalue = tabBarController?.tabBar.items?[1].badgevalue,        let value = Int(badgevalue) {        tabBarController?.tabBar.items?[1].badgevalue = String(value + 1)    } else {        tabBarController?.tabBar.items?[1].badgevalue = "1"    }

要删除徽章，只需将nil分配给重写viewDidAppear方法的badgevalue：

override func viewDidAppear(animated: Bool) {    tabBarController?.tabBar.items?[1].badgevalue = nil}