RubyMotion和UIPickerView

Question

我希望使用UIPickerView选择一个数字，并将所选的数字分配给标签。我想出了如何使用ib创业板和使用接口生成器来创建初始接口，它工作得很好。然而，我想纯粹使用RubyMotion代码来完成它，而且我无法让它在我的生命中发挥作用。我管理的最好的方法是标签返回True，而不是数字。

对于选择视图委托方法，我使用了以下标准代码：

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

下面是如何单独在RubyMotion中完成这一任务。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