iOS 13 and Below How to change Status Bar Color?

statusbar-color-change.md

if #available(iOS 13.0, *) {
    let app = UIApplication.shared
    let statusBarHeight: CGFloat = app.statusBarFrame.size.height
    
    let statusbarView = UIView()
    statusbarView.backgroundColor = UIColor.red
    view.addSubview(statusbarView)
  
    statusbarView.translatesAutoresizingMaskIntoConstraints = false
    statusbarView.heightAnchor
        .constraint(equalToConstant: statusBarHeight).isActive = true
    statusbarView.widthAnchor
        .constraint(equalTo: view.widthAnchor, multiplier: 1.0).isActive = true
    statusbarView.topAnchor
        .constraint(equalTo: view.topAnchor).isActive = true
    statusbarView.centerXAnchor
        .constraint(equalTo: view.centerXAnchor).isActive = true
  
} else {
    let statusBar = UIApplication.shared.value(forKeyPath: "statusBarWindow.statusBar") as? UIView
    statusBar?.backgroundColor = UIColor.red
}

var statusBarTagNumber = 1
if #available(iOS 13.0, *) {
    let app = UIApplication.shared
    let statusBarHeight: CGFloat = app.statusBarFrame.size.height
    
    for subview in view.subviews {
        if subview.tag == statusBarTagNumber {
            subview.backgroundColor = backgroundColor
            return
        }
    }

    let statusbarView = UIView()
    statusbarView.tag = statusBarTagNumber
    statusbarView.backgroundColor = UIColor.red
    view.addSubview(statusbarView)
  
    statusbarView.translatesAutoresizingMaskIntoConstraints = false
    statusbarView.heightAnchor
        .constraint(equalToConstant: statusBarHeight).isActive = true
    statusbarView.widthAnchor
        .constraint(equalTo: view.widthAnchor, multiplier: 1.0).isActive = true
    statusbarView.topAnchor
        .constraint(equalTo: view.topAnchor).isActive = true
    statusbarView.centerXAnchor
        .constraint(equalTo: view.centerXAnchor).isActive = true
  
} else {
    let statusBar = UIApplication.shared.value(forKeyPath: "statusBarWindow.statusBar") as? UIView
    statusBar?.backgroundColor = UIColor.red
}