来自iOS的警告“请勿将子视图直接添加到视觉效果视图本身" [英] Warning from iOS "Do not add subviews directly to the visual effect view itself"

问题描述

下面有一个函数，当我链接到iOS 11 SDK时，出现错误:

I have a function below and when I link with the iOS 11 SDK, I get an error:

请勿将子视图直接添加到视觉效果视图本身，而应将其添加到-contentView.

Do not add subviews directly to the visual effect view itself, instead add them to the -contentView.

可以通过更改

let effectView = UIVisualEffectView(effect: UIBlurEffect(style: .dark))"

到

effectView = UIView()

但是效果不是那样.如何继续使用UIVisualEffectView而不是UIView?我想保持效果.

but the effect is not present that way. How can I keep using UIVisualEffectView instead of UIView? I want to keep the effect.

let imagePicker = UIImagePickerController()
let messageFrame = UIView()
var activityIndicator = UIActivityIndicatorView()
var strLabel = UILabel()    
let effectView = UIVisualEffectView(effect: UIBlurEffect(style: .dark))

func activityIndicator(_ title: String) {  
    strLabel.removeFromSuperview()
    activityIndicator.removeFromSuperview()
    effectView.removeFromSuperview()

    strLabel = UILabel(frame: CGRect(x: 50, y: 0, width: 160, height: 46))
    strLabel.text = title
    strLabel.font = UIFont.systemFont(ofSize: 14, weight: UIFont.Weight.medium)
    strLabel.textColor = UIColor(white: 0.9, alpha: 0.7)

    effectView.frame = CGRect(x: (view.frame.midX - strLabel.frame.width/2), y: (view.frame.midY - strLabel.frame.height/2), width: 160, height: 46)
    effectView.layer.cornerRadius = 15
    effectView.layer.masksToBounds = true

    activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .white)
    activityIndicator.frame = CGRect(x: 0, y: 0, width: 46, height: 46)
    activityIndicator.startAnimating()

    effectView.addSubview(activityIndicator)
    effectView.addSubview(strLabel)
    view.addSubview(effectView)
}

推荐答案

只需遵循错误提示，然后将子视图添加到UIVisualEffectView的contentView.

Just follow what the error says and add your subviews to UIVisualEffectView's contentView.

effectView.contentView.addSubview(activityIndicator)
effectView.contentView.addSubview(strLabel)

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