RubyMotion 和 UIPickerView

Question

我想使用 UIPickerView 选择一个数字并将所选数字分配给一个标签。我想出了如何使用 ib gem 并使用界面生成器来创建初始界面，它工作正常。但是，我想纯粹使用 RubyMotion 代码来完成它，而且我一辈子都无法让它工作。我管理的最好的方法是让标签返回 True 而不是数字。

我正在为选取器视图委托方法使用以下标准代码：

def pickerView(pickerView, numberOfRowsInComponent:component)
  101
end

def pickerView(pickerView, titleForRow:row, forComponent:component)
  row.to_s
end

def numberOfComponentsInPickerView (pickerView)
  1
end

def pickerView(pickerView, didSelectRow:row, inComponent:component)

end

def pickerView(pickerView, titleForRow:row, forComponent:component)
  " #{row+1}"
end

def submit
  totals.addTotals(myPicker.selectedRowInComponent(0))
end

然后标签文本填充如下：

numLabel = UILabel.new
numLabel.text = "Number Selected:  #{submit}"
numLabel.font = UIFont.boldSystemFontOfSize(18)
numLabel.frame = [[20,320],[260,340]]
numLabel.numberOfLines = 2
numLabel.adjustsFontSizeToFitWidth = 'YES'
self.view.addSubview numLabel

总计是一个共享客户端。

Answer 1

以下是仅在 RubyMotion 中执行此操作的方法。请注意，标签和选择器是在viewDidLoad 中设置的。标签在pickerView:didSelectRow:inComponent:中更新

app_delegate.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @window.rootViewController = PickerDemo.new
    @window.makeKeyAndVisible
    true
  end
end

picker_demo.rb

class PickerDemo < UIViewController
  def viewDidLoad
    view.backgroundColor = UIColor.whiteColor
    @numLabel = UILabel.new
    @numLabel.text = "Number Selected:  0"
    @numLabel.font = UIFont.boldSystemFontOfSize(18)
    @numLabel.frame = [[20,100],[260,120]]
    @numLabel.numberOfLines = 2
    @numLabel.adjustsFontSizeToFitWidth = true
    view.addSubview(@numLabel)

    @picker = UIPickerView.new
    @picker.frame = [[0, 183], [320, 162]]
    @picker.delegate = self
    @picker.dataSource = self
    view.addSubview(@picker)
  end

  def pickerView(pickerView, numberOfRowsInComponent:component)
    101
  end

  def pickerView(pickerView, titleForRow:row, forComponent:component)
    row.to_s
  end

  def numberOfComponentsInPickerView(pickerView)
    1
  end

  def pickerView(pickerView, didSelectRow:row, inComponent:component)
    @numLabel.text = "Number Selected:  #{row}"
  end
end