徽标上有一个提示 限制大小，这对我来说很小，这是如何正确更改它

使约束满足您的需求

如果让welcomeScreen = welcomeStepUI为？  FUIWelcomeScreen {
   让logoImage = UIImage（named：" LogoName"）
   让customImageView = UIImageView（image：logoImage）
   customImageView.contentMode = .scaleAspectFill
   welcomeScreen.logoImageView.addSubview（customImageView）
   customImageView.backgroundColor = UIColor.white
   customImageView.translatesAutoresizingMaskIntoConstraints = false
   customImageView.heightAnchor.constraint（equalToConstant：50）.isActive = true
   customImageView.widthAnchor.constraint（equalToConstant：200）.isActive = true
   customImageView.centerXAnchor.constraint（equalTo：welcomeScreen.logoImageView.centerXAnchor）.isActive = true
   customImageView.bottomAnchor.constraint（equalTo：welcomeScreen.logoImageView.bottomAnchor）.isActive = true
 }