快速呈现来自 UITabBarItem 的弹出框答案

【问题标题】：Present a popover from a UITabBarItem in swift快速呈现来自 UITabBarItem 的弹出框
【发布时间】：2015-12-07 04:22:53
【问题描述】：

我发现了很多示例展示如何从 UIBarButtonItem 呈现弹出框，但我想知道如何从 UITabBarItem 呈现它。

这是我目前所拥有的

let selectedItem = self.menuTabBar.items![3]    

let menuViewController: ActivityPopoverViewController = storyboard.instantiateViewControllerWithIdentifier("MenuViewController") as! ActivityPopoverViewController
presentViewController(menuViewController, animated: true, completion: nil)
menuViewController.modalPresentationStyle = .Popover


if let popoverMenuViewController = menuViewController.popoverPresentationController {
    popoverMenuViewController.permittedArrowDirections = .Any
    popoverMenuViewController.delegate = menuViewController


//  popoverMenuViewController.barButtonItem = ?
}

我尝试将 UITabBarItem 的 selectedItem 转换为 UIBarButtonItem，但没有成功。我确信这是一个简单的过程，但我似乎找不到任何关于如何做到这一点的帮助。

我的目标是让这个橙色弹出框指示未读活动。

更新 #1。经过更多研究，我发现了这种呈现视图控制器的策略

let tabBarItemWidth = Int(self.menuTabBar.frame.size.width) / (self.menuTabBar.items?.count)!
let x = tabBarItemWidth * 3;
let newRect = CGRect(x: x, y: 0, width: tabBarItemWidth, height: Int(self.menuTabBar.frame.size.height))
print(newRect)

let menuViewController: ActivityPopoverViewController = storyboard.instantiateViewControllerWithIdentifier("ActivityPopoverViewController") as! ActivityPopoverViewController
menuViewController.modalPresentationStyle = .Popover


if let popoverMenuViewController = menuViewController.popoverPresentationController {
    popoverMenuViewController.permittedArrowDirections = .Down
    popoverMenuViewController.delegate = menuViewController
    popoverMenuViewController.sourceRect = newRect
    popoverMenuViewController.sourceView = self.menuTabBar
    presentViewController(menuViewController, animated: true, completion: nil)

}

现在我的弹出框正在显示，但 newRect 的边界不起作用。弹出框占据了整个屏幕，而不是被限制在新的范围内。有谁知道如何强制新维度？

更新 #2

工作代码

let tabBarItemWidth = Int(self.menuTabBar.frame.size.width) / (self.menuTabBar.items?.count)!
let x = tabBarItemWidth * 3;
let newRect = CGRect(x: x, y: 0, width: tabBarItemWidth, height: Int(self.menuTabBar.frame.size.height))
print(newRect)

let menuViewController: ActivityPopoverViewController = storyboard.instantiateViewControllerWithIdentifier("ActivityPopoverViewController") as! ActivityPopoverViewController
menuViewController.modalPresentationStyle = .Popover
menuViewController.view.frame = newRect
menuViewController.preferredContentSize = CGSizeMake(150, 150)

if let popoverMenuViewController = menuViewController.popoverPresentationController {
    popoverMenuViewController.permittedArrowDirections = .Down
    popoverMenuViewController.delegate = menuViewController
    popoverMenuViewController.sourceRect = newRect
    popoverMenuViewController.sourceView = self.menuTabBar

    presentViewController(menuViewController, animated: true, completion: nil)

}

【问题讨论】：

stackoverflow.com/a/5278744/1597744 或 stackoverflow.com/a/4405575/1597744
@Virussmca 我通过简单的谷歌搜索发现了这些链接，但我无法在 Swift 中复制这些链接。我的 menuViewController 或 popoverMenuViewController 都没有方法 presentPopoverFromRect
将自定义视图添加为 [appdelegate.window addSubview:yourview] 并在该 tababr 项目上添加框架

标签： swift popover uitabbaritem

【解决方案1】：

工作代码

let tabBarItemWidth = Int(self.menuTabBar.frame.size.width) / (self.menuTabBar.items?.count)!
let x = tabBarItemWidth * 3;
let newRect = CGRect(x: x, y: 0, width: tabBarItemWidth, height: Int(self.menuTabBar.frame.size.height))

let menuViewController: ActivityPopoverViewController = storyboard.instantiateViewControllerWithIdentifier("ActivityPopoverViewController") as! ActivityPopoverViewController
menuViewController.modalPresentationStyle = .Popover
menuViewController.view.frame = newRect
menuViewController.preferredContentSize = CGSizeMake(150, 150)

if let popoverMenuViewController = menuViewController.popoverPresentationController {
    popoverMenuViewController.permittedArrowDirections = .Down
    popoverMenuViewController.delegate = menuViewController
    popoverMenuViewController.sourceRect = newRect
    popoverMenuViewController.sourceView = self.menuTabBar
    popoverMenuViewController.backgroundColor = UIColor.orangeColor()

    presentViewController(menuViewController, animated: true, completion: nil)
}

【讨论】：

【解决方案2】：

//Get the views like this...
 func orderedTabBarItemViews() -> [UIView] {
        let interactionViews = tabBar.subviews.filter({$0.userInteractionEnabled})
        return interactionViews.sort({$0.frame.minX < $1.frame.minX})
    }

【讨论】：