DTGradientButton을 사용하여 버튼을 정렬해 보았습니다.

환경

・Mac Book Pro(macOS:BigSur)
・Xcode(ver:12.5)

구현 예

코드 예

ViewController.swift

class ViewController: UIViewController {

    @IBOutlet weak var gradientButton1: UIButton!
    @IBOutlet weak var gradientButton2: UIButton!
    @IBOutlet weak var gradientButton3: UIButton!
    @IBOutlet weak var gradientButton4: UIButton!


    override func viewDidLoad() {
        super.viewDidLoad()

        let colors1 = [UIColor(named:"Color1")!, UIColor(named: "Color2")!]
        let colors2 = [UIColor(named:"Color3")!, UIColor(named: "Color4")!]
        let colors3 = [UIColor(named:"Color5")!, UIColor(named: "Color6")!]
        let colors4 = [UIColor(named:"Color7")!, UIColor(named: "Color8")!]

        gradientButton1.setGradientBackgroundColors(colors1, direction: .toTop, for: .normal)
        gradientButton1.layer.cornerRadius = 10.0
        gradientButton1.layer.masksToBounds = true

        gradientButton2.setGradientBackgroundColors(colors2, direction: .toBottom, for: .normal)
        gradientButton2.layer.cornerRadius = 10.0
        gradientButton2.layer.masksToBounds = true

        gradientButton3.setGradientBackgroundColors(colors3, direction: .toBottomLeft, for: .normal)
        gradientButton3.layer.cornerRadius = 10.0
        gradientButton3.layer.masksToBounds = true

        gradientButton4.setGradientBackgroundColors(colors4, direction: .toBottomRight, for: .normal)
        gradientButton4.layer.cornerRadius = 10.0
        gradientButton4.layer.masksToBounds = true   
    }
}