ios - Swift:如何将数据绑定(bind)到循环中的 View ？

Question

我想通过for循环将数据绑定(bind)到UIImageView-es数组。但我不知道如何像Javascript数据属性一样简单地绑定(bind)。我有一个想法，制作一个数组 [UIImage : data] 来做到这一点。好吧，我的代码有问题:

问题:

1. 如何在selectDecoration中获取其patternSelector？

2. 如何创建与循环数据绑定(bind)的outlet？例如，如何将每个变量 pattern 绑定(bind)到每个操作 selectDecoration() ？

   func selectDecoration(recognizer: UITapGestureRecognizer) {
       print("OK")
   }
   let patternSelectorHeight: CGFloat = 120        
   var i : Int = 0
   //var patternViews = [UIImageView]()
   for pattern in decorationPatterns {
   
       let patternSelector = UIImageView(image: UIImage(named: "test.jpg"))
       if let p = patternSelector.image {
           let proportion = p.size.width / p.size.height
           let w = proportion * patternSelectorHeight
   
   
           let patternX: CGFloat = (w + Conf.Size.margin) * CGFloat(i) + Conf.Size.margin
           let patternOrigin = CGPoint(x: patternX, y: decorationSelectionTitleHeight)
   
           patternSelector.userInteractionEnabled = true
   
           patternSelector.frame = CGRect(origin: patternOrigin, size: CGSize(width: w, height: patternSelectorHeight))
           patternSelector.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "selectDecoration:"))
   
           decorationBg.addSubview(patternSelector)
           decorationBg.bringSubviewToFront(patternSelector)
           //patternViews.append(patternSelector)
   
       }
       i++
   }
   

Answer 1

Swift 中没有对数据绑定(bind)的内置支持。您需要在数组中保留对 UIImageView 对象的引用(可能按照您的建议)，以便稍后更新它们。

您需要设置 patterSelector.userInteractionEnabled=true 才能使 UITapGestureRecognizer 正常工作。

let patterSelectorSize = CGSize(width: 80.0, height: 160.0)
var imageViews = [UIImageView]()  // This probably needs to be an instance variable so you can access it outside of this function
var i : Int = 0
for _ in decorationPatterns {
    let patternX: CGFloat = (patterSelectorSize.width + 10) * CGFloat(i) + 10
    let patternOrigin = CGPoint(x: patternX, y: CGFloat(60))
    let patterSelector = UIImageView(image: UIImage(named: "default.jpeg"))
    patterSelector.frame = CGRect(origin: patternOrigin, size: patterSelectorSize)
    patterSelector.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "selectDecoration:"))
    patterSelector.userInteractionEnabled=true
    imageViews.append(patterSelector)

    decorationBg.addSubview(patterSelector)
    decorationBg.bringSubviewToFront(patterSelector)
    i++
}

您还必须确保 decorationBg 中的 userInteractionEnabled 为 true，否则触摸将不会传播到您的 ImageView