如何根据内容大小动态更改视图高度？

Question

我正在尝试将一个xib文件两次添加到contentView，我想根据其中的内容大小更改contentView的高度。

此图显示了我想要实现的目标

这是我的代码

import UIKit

class ProfileSetViewController: UIViewController {

@IBOutlet weak var contentView: UIView!
@IBOutlet weak var contentViewHeight: NSLayoutConstraint!

override func viewDidLayoutSubviews() {

    if let CarViewAdd = NSBundle.mainBundle().loadNibNamed("CarViewAdd", owner: self, options: nil)[0] as? CarViewAdd {

        contentViewHeight.constant = 220
        contentView.frame.size.height = 220
        CarViewAdd.frame = CGRectMake(0, 0, self.contentView.frame.size.width, 220)
        CarViewAdd.carImage.layer.cornerRadius = 10
        CarViewAdd.carImage.clipsToBounds = true
        CarViewAdd.carImage.layer.borderColor = UIColor(red: 255/255, green: 0/255, blue: 0/255, alpha: 1.0).CGColor
        CarViewAdd.carImage.layer.borderWidth = 3
        contentView.addSubview(CarViewAdd)

    }

    if let CarViewAdd = NSBundle.mainBundle().loadNibNamed("CarViewAdd", owner: self, options: nil)[0] as? CarViewAdd {

        contentViewHeight.constant = 442
        contentView.frame.size.height = 442
        CarViewAdd.frame = CGRectMake(0, 222, self.contentView.frame.size.width, 220)
        CarViewAdd.carImage.layer.cornerRadius = 10
        CarViewAdd.carImage.clipsToBounds = true
        CarViewAdd.carImage.layer.borderColor = UIColor(red: 255/255, green: 0/255, blue: 0/255, alpha: 1.0).CGColor
        CarViewAdd.carImage.layer.borderWidth = 3
        contentView.addSubview(CarViewAdd)
    }

}

这是我得到的结果。

请注意顶部xib图片无法正确显示。我该如何解决这个问题？

Answer 1

我通过为每个xib添加一个带有xib文件所需帧的UIView来解决问题，然后将xib添加到具有相同高度和宽度的UIView。

Answer 2

尝试更改carImage.contentMode = .ScaleAspectFit