ios - 如何将图像插入由 UIViewController 创建的栏？

Question

可以创建选项卡 - 但是，如何将图形插入每个选项卡以及选项卡后，您如何将其称为新屏幕？

# Create a tabbar
tabbar = UITabBarController.alloc.init

# Each Tab has a view controller allocated

tabbar.viewControllers = [
    UIViewController.alloc.init,
    UIViewController.alloc.init, 
    UIViewController.alloc.init,
    UIViewController.alloc.init
]

# Selected index to 0
tabbar.selectedIndex = 0

# The root view controller also changed
@window.rootViewController = UINavigationController.alloc.initWithRootViewController(tabbar)

# We will force to use a full screen layout.
@window.rootViewController.wantsFullScreenLayout = true

Answer 1

请参阅https://github.com/HipByte/RubyMotionSamples上的“Beers”示例项目

您走在正确的轨道上，唯一的区别是您需要列出特定的视图控制器类而不是通用的 UIViewController 类。从样本中：

tabbar.viewControllers = [BeerMapController.alloc.init,
                          BeerListController.alloc.init]

然后在这些控制器的每一个init方法中，你设置它tabBarItem来给它一个标题和图像：

class BeerListController < UITableViewController
  def init
    if super
      self.tabBarItem = UITabBarItem.alloc.initWithTitle('List', image:UIImage.imageNamed('list.png'), tag:1)
    end
    self
  end
end

或者，如果您还没有特定的视图控制器，我想您可以执行以下操作：

tabbar.viewControllers = [
  UIViewController.alloc.init,
  UIViewController.alloc.init
]
tabbar.viewControllers[0].tabBarItem = UITabBarItem.alloc.initWithTitle('List', image:UIImage.imageNamed('list.png'), tag:1)
# etc.