Question

我是iOS开发人员，通常使用Swift。最近，我想知道应该如何为iOS中的应用程序使用基本图像大小。

现在，我为所有应用基于640x1156（iPhone SE大小）准备图像（例如，我使用640x1156的背景图像）。但是有人说我应该使用750x1334（iPhone 6,7,8尺寸），因为如果使用iPhone SE尺寸的图像，这些质量看起来会有些低。此外，只有很少的人使用iPhone SE。

我应该使用哪个尺寸的图像？

更新

我使用背景图像和其他对象（6个正方形），当使用iPhone 6s和iPhone X时，外观因设备而异。

class Constants {

    //width of base design size
    static let guiPartsWidthOnDesign = CGFloat(750.0)

    //ratio for layout
    static var guiPartsMultiplier: CGFloat = UIScreen.main.bounds.width / (Constants.guiPartsWidthOnDesign / 2.0)

    //detect safe area
    static let safeArea = UIApplication.shared.delegate?.window??.safeAreaInsets.bottom

}

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

    self.view.frame = CGRect(x: 0,
                             y: 0,
                             width: self.view.frame.size.width,
                             height: self.view.frame.size.height)

        //backgrond
        let background = UIImageView.init(frame: UIScreen.main.bounds)
        background.center.x = self.view.frame.size.width/2
        background.image = UIImage(named:"BG")
        background.contentMode = UIViewContentMode.scaleAspectFill
        self.view.insertSubview(background, at: 0)

        //downleft blue button
        let blueButton = UIImageView.init(frame: CGRect(
            x: 64/2*Constants.guiPartsMultiplier,
            y: self.view.frame.size.height-(52/2+34/2)*Constants.guiPartsMultiplier-Constants.safeArea!,
            width: 60/2*Constants.guiPartsMultiplier,
            height: 52/2*Constants.guiPartsMultiplier))
        self.view.addSubview(blueButton)
        blueButton.backgroundColor = UIColor.blue

        //green button
        let greenButton = UIImageView.init(frame: CGRect(
            x: (60/2+64/2+128/2)*Constants.guiPartsMultiplier,
            y: self.view.frame.size.height-(52/2+34/2)*Constants.guiPartsMultiplier-Constants.safeArea!,
            width: 60/2*Constants.guiPartsMultiplier,
            height: 52/2*Constants.guiPartsMultiplier))
        self.view.addSubview(greenButton)
        greenButton.backgroundColor = UIColor.green

        //cyan button
        let cyanButton = UIImageView.init(frame: CGRect(
            x: (64/2+(60/2)*2+(128/2*2))*Constants.guiPartsMultiplier,
            y: self.view.frame.size.height-(52/2+34/2)*Constants.guiPartsMultiplier-Constants.safeArea!,
            width: 60/2*Constants.guiPartsMultiplier,
            height: 52/2*Constants.guiPartsMultiplier))
        self.view.addSubview(cyanButton)
        cyanButton.backgroundColor = UIColor.cyan

        //4 blue buttons
        for i in 1..<5 {
            let subBlueButton = UIImageView.init(frame: CGRect(
                x: 64/2*Constants.guiPartsMultiplier,
                y: self.view.frame.size.height-((43.0+CGFloat(50*i))*Constants.guiPartsMultiplier)-Constants.safeArea!,
                width: 60/2*Constants.guiPartsMultiplier,
                height: 52/2*Constants.guiPartsMultiplier))
            self.view.addSubview(subBlueButton)
            subBlueButton.alpha = 1.0
            subBlueButton.backgroundColor = UIColor.blue
        }

        //down bar
        let bar = UIImageView.init(frame: CGRect(
            x:0,
            y: self.view.frame.size.height-50,
            width: self.view.frame.size.width,
            height: 50))
        bar.alpha = 0.3
        bar.backgroundColor = UIColor.blue
        self.view.addSubview(bar)
}

UPDATE2
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