Question

我想通过for循环将数据绑定到UIImageView-es数组。但我不知道如何绑定像Javascript数据属性一样简单。我有一个想法，制作一个数组[UIImage：data]来做到这一点。好的，我的代码出了问题：

问题：

如何在selectDecoration中获取其patternSelector？

如何在循环中创建与数据绑定的出口？例如，如何将每个变量pattern绑定到每个操作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中没有内置的数据绑定支持。您可能需要在数组中保留对UIImageView个对象的引用，以便您以后可以更新它们。

您需要设置patterSelector.userInteractionEnabled=true才能使UITapGestureRecognizer生效。

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userInteractionEnabled中的true为decorationBg，否则不会传播到您的图片视图

Answer 2

（1）如何在循环中创建与数据绑定的出口？

如果要绑定String数据，请尝试accessibilityLabel属性。你可以设置＆amp;无声地检索价值。

（2）为什么跟随的UITapGestureRecoginzer根本不起作用？

您错过了启用userInteractionEnabled

的UIImageView

希望这会对你有所帮助。

Swift：如何将数据绑定到循环中的视图？

2 个答案: