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我正在制作基于FoodTracker源代码的棒球outcount代码。这是我的代码，但空的圆不在此代码中。我怎样才能让空圈评分？如果你们能帮助我，我将不胜感激。谢谢！！我怎样才能让棒球的空圈数出来？
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import UIKit
class RatingControl: UIView {
// MARK: Properties
var rating = 0 {
didSet {
setNeedsLayout()
}
}
var ratingButtons = [UIButton]()
var spacing = 3
var circles = 3
// MARK: Initialization
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let filledCircleImage = UIImage(named: "checkedRed")
let emptyCircleImage = UIImage(named: "UncheckedRed")
for _ in 0..<3 {
let button = UIButton()
button.setImage(emptyCircleImage, forState: .Normal)
button.setImage(filledCircleImage, forState: .Selected)
button.setImage(filledCircleImage, forState: [.Highlighted, .Selected])
button.adjustsImageWhenHighlighted = false
button.addTarget(self, action: "ratingButtonTapped:", forControlEvents: .TouchDown)
ratingButtons += [button]
addSubview(button)
}
}
override func layoutSubviews() {
// Set the button's width and height to a square the size of the frame's height.
let buttonSize = Int(frame.size.height)
var buttonFrame = CGRect(x: 0, y: 0, width: buttonSize, height: buttonSize)
// Offset each button's origin by the length of the button plus spacing.
for (index, button) in ratingButtons.enumerate() {
buttonFrame.origin.x = CGFloat(index * (buttonSize + spacing))
button.frame = buttonFrame
}
updateButtonSelectionStates()
}
override func intrinsicContentSize() -> CGSize {
let buttonSize = Int(frame.size.height)
let width = (buttonSize + spacing) * circles
return CGSize(width: width, height: buttonSize)
}
// MARK: Button Action
func ratingButtonTapped(button: UIButton) {
rating = ratingButtons.indexOf(button)! + 1
updateButtonSelectionStates()
}
func updateButtonSelectionStates() {
for (index, button) in ratingButtons.enumerate() {
// If the index of a button is less than the rating, that button should be selected.
button.selected = index < rating
}
}
}