Custom MainStarbody xcode

background Custom 1
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let backgroundImageView = UIImageView()

    
    func setBackground() {
        view.addSubview(backgroundImageView)
        backgroundImageView.translatesAutoresizingMaskIntoConstraints = false
        backgroundImageView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        backgroundImageView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        backgroundImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        backgroundImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        
        backgroundImageView.image = UIImage(named: "background-wave")
        view.sendSubviewToBack(backgroundImageView)
    }
}
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TextFiled Custom 2 
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1 Create File Swift named SATextField.swift

import UIKit

class SATextField: UITextField {
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setUpField()
    }
    
    
    required init?(coder aDecoder: NSCoder) {
        super.init( coder: aDecoder )
        setUpField()
    }
    
    
    private func setUpField() {
        tintColor             = .white
        textColor             = .darkGray
        font                  = UIFont(name: Fonts.avenirNextCondensedDemiBold, size: 18)
        backgroundColor       = UIColor(white: 1.0, alpha: 0.5)
        autocorrectionType    = .no
        layer.cornerRadius    = 25.0
        clipsToBounds         = true
        
        let placeholder       = self.placeholder != nil ? self.placeholder! : ""
        let placeholderFont   = UIFont(name: Fonts.avenirNextCondensedDemiBold, size: 18)!
        attributedPlaceholder = NSAttributedString(string: placeholder, attributes:
            [NSAttributedString.Key.foregroundColor: UIColor.lightGray,
             NSAttributedString.Key.font: placeholderFont])
        
        let indentView        = UIView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
        leftView              = indentView
        leftViewMode          = .always
    }
}
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Button Custom 3 
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1 Create File Swift named SAButton.swift


import UIKit

class SAButton: UIButton {
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupButton()
    }
    
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupButton()
    }
    
    
    private func setupButton() {
        backgroundColor     = Colors.tropicBlue
        titleLabel?.font    = UIFont(name: Fonts.avenirNextCondensedDemiBold, size: 22)
        layer.cornerRadius  = frame.size.height/2
        setTitleColor(.white, for: .normal)
    }
}

3 Create File named Constants.swift and add the code

struct Colors {
static let tropicBlue = UIColor(red: 0, green: 192/255, blue: 255/255, alpha: 1)
}

struct Fonts {
static let avenirNextCondensedDemiBold = "AvenirNextCondensed-DemiBold"
}