Ios 如何在运行时更改子视图（UIImageView）中的图像？

我有一个带有5个UIImageView的uiStackView，我需要在运行时更改此imageView中的图像

现在，我删除了所有子视图，生成了新的UIImageView，并像子视图一样添加了它，但这对性能来说是一种糟糕的做法。我试试看：

let targetStar = Int(floorf(value * Float(uiStars.subviews.count))) - 1
let factor = CGFloat(min(1, max(self.value, 0)))
let starsCount = uiStars.subviews.count
uiStars.subviews.forEach { $0.removeFromSuperview() }

for i in 0..<starsCount {
    if i < targetStar {
        let starView = UIImageView(image: star!.maskWithColor(color: UIColor.blue.cgColor, factor: 0))
        starView.contentMode = .scaleAspectFit
        uiStars.addArrangedSubview(starView)
    }
    else if i == targetStar {
        let starView = UIImageView(image: star!.maskWithColor(color: UIColor.blue.cgColor, factor: factor))
        starView.contentMode = .scaleAspectFit
        uiStars.addArrangedSubview(starView)
    }
    else {
        let starView = UIImageView(image: star!)
        starView.contentMode = .scaleAspectFit
        uiStars.addArrangedSubview(starView)
    }
}

让targetStar=Int（floorf（value*Float（uiStars.subviews.count））-1
let factor=CGFloat（最小值（1，最大值（自身值，0）））
让starscont=uiStars.subviews.count
uiStars.subviews.forEach{$0.removeFromSuperview（）}
对于0..中的i，这是工作：

let targetStar = Int(floorf(value * Float(uiStars.subviews.count))) - 1
let factor = CGFloat(min(1, max(self.value, 0)))
let starsCount = uiStars.subviews.count

for i in 0..<starsCount {
    if i < targetStar {
      let view = uiStars.subviews[i] as! UIImageView
      view.image = star!.maskWithColor(color: UIColor.blue.cgColor, factor: 0)
    } else if i == targetStar {
        let view = uiStars.subviews[i] as! UIImageView
        view.image = star!.maskWithColor(color: UIColor.blue.cgColor, factor: factor)
    } else {
        let view = uiStars.subviews[i] as! UIImageView
        view.image = star!
    }
}

让targetStar=Int（floorf（value*Float（uiStars.subviews.count））-1
let factor=CGFloat（最小值（1，最大值（自身值，0）））
让starscont=uiStars.subviews.count
因为我在0。。
let targetStar = Int(floorf(value * Float(uiStars.subviews.count))) - 1
let factor = CGFloat(min(1, max(self.value, 0)))
let starsCount = uiStars.subviews.count

for i in 0..<starsCount {
    if i < targetStar {
      let view = uiStars.subviews[i] as! UIImageView
      view.image = star!.maskWithColor(color: UIColor.blue.cgColor, factor: 0)
    } else if i == targetStar {
        let view = uiStars.subviews[i] as! UIImageView
        view.image = star!.maskWithColor(color: UIColor.blue.cgColor, factor: factor)
    } else {
        let view = uiStars.subviews[i] as! UIImageView
        view.image = star!
    }
}