Question

我有一个costView，其中包含UILabel dollarSign和UILabel cost。 This is how dollarSign is being constrained. This is how cost is being constrained.

在AddViewController我更改了一些约束，包括costView的高度

class AddViewController: UIViewController {


@IBOutlet weak var costView: UIView!
@IBOutlet weak var statusBarHeight: NSLayoutConstraint!
@IBOutlet weak var navigationBar: UINavigationBar!
@IBOutlet weak var dollarSign: UILabel!
@IBOutlet weak var cost: UILabel!
@IBOutlet weak var keyboardHeight: NSLayoutConstraint!
@IBOutlet weak var costViewHeight: NSLayoutConstraint!

override func viewDidLoad() {
    super.viewDidLoad()

    //Set size of cost view & numbers keyboard
    let halfViewHeight = (view.bounds.height - statusBarHeight.constant - navigationBar.bounds.height)/2
    costViewHeight.constant = halfViewHeight/CGFloat(4)
    keyboardHeight.constant = halfViewHeight - costViewHeight.constant

    //Adjust font size of dollar sign & cost
    cost.adjustsFontSizeToFitWidth = true
    print("cost frame: \(cost.frame)")
    dollarSign.adjustsFontSizeToFitWidth = true
    print("dollar sign frame: \(dollarSign.frame)")
}
}

当我加载应用时，约束costViewHeight＆amp; keyboardHeight相应地更新并重新排列。但是，标签dollarSign和cost的字体大小不会自行调整，as you can see here.

在这里添加2行后：

    //Adjust font size of dollar sign & cost
    cost.adjustsFontSizeToFitWidth = true
    cost.backgroundColor = UIColor.redColor() //add this line
    print("cost frame: \(cost.frame)")
    dollarSign.adjustsFontSizeToFitWidth = true
    dollarSign.backgroundColor = UIColor.redColor() //add this line
    print("dollar sign frame: \(dollarSign.frame)")

You can see the frame of cost and dollarSign readjust themselves to fit in with the new constraints.

问题：由于我使用.adjustsFontSizeToFitWidth = true，为什么在更改高度后字体大小没有变化？ .adjustFontSizeToFitWidth仅在更改宽度时有效吗？如果是这样，我该如何制作.adjustFontSizeToFitHeight方法？

我注意到一个奇怪的事情可能与否有关系是当我打印出cost和dollarSign帧时，它们与故事板上列出的帧完全相同（cost frame和dollarSign frame）。

cost frame: (567.0, 7.5, 14.5, 34.0)
dollar sign frame: (8.0, 8.0, 15.0, 34.0)

这是奇怪的b / c，因为我更改costView的高度cost和dollarSign的帧应更改（which they do）。但是，如果cost和dollarSign框架发生变化，那么为什么他们的数字不会改变？

更改约束时adjustsFontSizeToFitWidth不起作用？

0 个答案: