Question

我已经确认，“addLabel”函数给出的值正在改变，但是当打印出“label.frame.origin.y”时，它总是显示0.目前，代码看起来很糟糕，因为我一直在努力解决这个问题。有什么想法吗？

    var newY: Int = 8
    var mainViewNewHeight: Int = 251

    func setContentFromList(content: [String], target: UIView, targetHeight: NSLayoutConstraint) {
        newY = 8
        var bullet:UILabel!
        let width = Int(UIScreen.main.bounds.width) - 84
        let font = UIFont(name: "Helvetica", size: 18)
        for item in content {
            bullet = UILabel(frame: CGRect(x: 8, y: newY, width: 7, height: 17))
            bullet.text = "•"
            bullet.textColor = UIColor( red: 183/255, green: 110/255, blue:121/255, alpha: 1.0 )
            bullet.font = bullet.font.withSize(18)
            let a = CGFloat(newY)
            print(a) // Correct
            addLabel(y: a, text: item, font: font!, width: CGFloat(width), target: target)
            target.addSubview(bullet)
        }
        mainViewNewHeight += newY
        targetHeight.constant = CGFloat(newY)
    }

这就是“addLabel”功能：

    func addLabel(y: CGFloat, text:String, font:UIFont, width:CGFloat, target: UIView) {
        let label:UILabel = UILabel(frame: CGRect(x: 22, y: y, width: width, height: CGFloat.greatestFiniteMagnitude))
        print("Label y:", label.frame.origin.y) // Invalid (0.0)
        label.numberOfLines = 0
        label.lineBreakMode = NSLineBreakMode.byWordWrapping
        label.font = font
        label.text = text
        label.sizeToFit()
        newY += Int(label.frame.height)

        target.addSubview(label)
    }

Answer 1

您的问题出在CGFloat.greatestFiniteMagnitude删除integer value，并将其替换为let label:UILabel = UILabel(frame: CGRect(x: 22, y: y, width: width, height: 20))，您将看到您的代码可以正常运行。

基本上是这样的：

20.0
Label y: 20.0
41.0
Label y: 41.0
62.0
Label y: 62.0
83.0
Label y: 83.0

打印出来：

@import url('https://fonts.googleapis.com/css?family=El+Messiri');

Swift UILabel没有设置正确的y值

1 个答案: