RubyMotion餅圖CALayer

Question

我正在嘗試將此示例http://lepetit-prince.net/ios/?p=1510轉換為RubyMotion，而我創建的“餅圖切片”均未顯示在屏幕上。 在示例中，我沒有使用for循環，因為我只使用了兩個餅的“切片”。 有任何想法嗎？

chart = UIView.alloc.initWithFrame(CGRect.new([60, 100], [200, 200]))
chart.backgroundColor = UIColor.colorWithRed(0, green:0, blue:0, alpha:0.5)
chart.layer.cornerRadius = 100
@window.addSubview(chart)

green = 70.0
red = 30.0

red = red / 100.0 * 2.0 * Math::PI
green = green / 100 * 2.0 * Math::PI
start = 0.0

path = UIBezierPath.alloc.init
finish = start + red
sa = start - Math::PI / 2.0
ea = finish - Math::PI / 2.0
puts sa, ea
path.moveToPoint(CGPoint.new(100, 100))
path.addArcWithCenter(CGPoint.new(100, 100), radius:100, startAngle:sa, endAngle:ea, clockwise:true)
sl = CAShapeLayer.alloc.init
sl.fillColor = UIColor.redColor
sl.path = path.CGPath
chart.layer.addSublayer(sl)

start = finish

path = UIBezierPath.alloc.init
finish = start + green
sa = start - Math::PI / 2.0
ea = finish - Math::PI / 2.0
path.moveToPoint(CGPoint.new(100, 100))
path.addArcWithCenter(CGPoint.new(100, 100), radius:100, startAngle:sa, endAngle:ea, clockwise:true)
sl = CAShapeLayer.alloc.init
sl.fillColor = UIColor.greenColor
sl.path = path.CGPath
chart.layer.addSublayer(sl)

mask = UIView.alloc.initWithFrame(CGRect.new([0, 0], [196, 196]))
mask.layer.cornerRadius = 98
mask.center = CGPoint.new(100, 100)
mask.backgroundColor = UIColor.whiteColor

chart.addSubview(mask)

Answer 1

我得到了您的代碼，可以進行少量修改。

1. 唯一真正的錯誤是CALayer的填充顏色必須是CGColor而不是UIColor 。 為了解決這個問題，我添加了.CGColor進行轉換。

2. 我將您的代碼放在ViewController的viewDidLoad中。 由於您沒有提供所有代碼，因此我不確定您是如何實現的。

3. 這是沒有必要使用CGPoint.new和CGRect.new在RubyMotion。 我將其替換為更簡單的直接數組常量，例如[100, 100]和[[60, 100], [200, 200]] 。

4. 我將面罩縮小了，使它看起來更像原始示例。

這是完整的代碼：

app_delegate.rb

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

view_controller.rb

class ViewController < UIViewController
  def viewDidLoad
    view.backgroundColor = UIColor.whiteColor

    chart = UIView.alloc.initWithFrame([[60, 100], [200, 200]])
    chart.backgroundColor = UIColor.colorWithRed(0, green:0, blue:0, alpha:0.5)
    chart.layer.cornerRadius = 100

    green = 70.0
    red = 30.0

    red = red / 100.0 * 2.0 * Math::PI
    green = green / 100 * 2.0 * Math::PI
    start = 0.0

    path = UIBezierPath.alloc.init
    finish = start + red
    sa = start - Math::PI / 2.0
    ea = finish - Math::PI / 2.0
    puts sa, ea
    path.moveToPoint([100, 100])
    path.addArcWithCenter([100, 100], radius:100, startAngle:sa, endAngle:ea, clockwise:true)
    sl = CAShapeLayer.alloc.init
    sl.fillColor = UIColor.redColor.CGColor
    sl.path = path.CGPath
    chart.layer.addSublayer(sl)

    start = finish

    path = UIBezierPath.alloc.init
    finish = start + green
    sa = start - Math::PI / 2.0
    ea = finish - Math::PI / 2.0
    path.moveToPoint([100, 100])
    path.addArcWithCenter([100, 100], radius:100, startAngle:sa, endAngle:ea, clockwise:true)
    sl = CAShapeLayer.alloc.init
    sl.fillColor = UIColor.greenColor.CGColor
    sl.path = path.CGPath
    chart.layer.addSublayer(sl)

    mask = UIView.alloc.initWithFrame([[0, 0], [100, 100]])
    mask.layer.cornerRadius = 50 
    mask.center = [100, 100]
    mask.backgroundColor = UIColor.whiteColor

    chart.addSubview(mask)
    view.addSubview(chart)
  end
end