ios - 如何以编程方式将我的 imageView 置于另一个 ImageView 的中心

Question

嗨，这是我的第一篇文章。感谢您的帮助。

我创建了一个 UIImageView 并在其上添加了模糊效果。现在我添加了另一个 UIImageView 作为模糊 ImageView 的 subview 。我想弄清楚如何以编程方式使它的高度和宽度成比例，以便它在所有屏幕尺寸上看起来都不错

我想出了如何将它居中但无法使尺寸看起来不错。我希望高度比其 super View 及其圆形的高度稍小，这样宽度就等于高度。

//create blurred profile picture
    //first create the uiimageview
    let blurProfilePic = UIImageView(frame: CGRectMake(0, 64, view.frame.size.width, view.frame.size.height/3.0))
    //assign it a value
    blurProfilePic.image = UIImage(named: "placeholder")
    //make sure it stays within the created bounds
    blurProfilePic.layer.masksToBounds = true
    //center the picture
    blurProfilePic.contentMode = UIViewContentMode.Center


    //create blur effect
    var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light)) as UIVisualEffectView
    visualEffectView.frame = blurProfilePic.bounds

    //add blur layer to blurProfilePic
    blurProfilePic.addSubview(visualEffectView)

    //create the real profile pic
    //arbitrary frame
    let profilePic = UIImageView(frame: CGRectMake(50, 50, 180, 180))
    //the 180,180 needs to be changed so that they are sized proportionally for all screens
    //center it inside the blurimage
    profilePic.center = CGPointMake(blurProfilePic.frame.size.width/2, blurProfilePic.frame.size.height/2)
    profilePic.image = UIImage(named: "placeholder")
    profilePic.layer.borderWidth = 5
    profilePic.layer.borderColor = UIColor.whiteColor().CGColor
    profilePic.layer.cornerRadius = profilePic.frame.size.width/2
    profilePic.clipsToBounds = true


    blurProfilePic.addSubview(profilePic)

    view.addSubview(blurProfilePic)

Answer 1

您是否尝试过使用 CGRectInset() 函数而不是匹配中心？这样你就可以将父 UIImageView 的框架分配给子框架，由 x,y 点插入，你根本不需要担心它的居中问题。