UIKitのInsetsまとめ

iOS
UIEdgeInsets
https://developer.apple.com/documentation/uikit/uiedgeinsets
目次

UILabel

UILabelのsub classを定義して、初期化時にinsetを渡す
drawText methodでinsetを適用 
class IndentLabel: UILabel {
    private let insets: UIEdgeInsets

    init(insets: UIEdgeInsets, frame: CGRect) {
        self.insets = insets

        super.init(frame: frame)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: insets))
    }
}

UIImageView

let insets = UIEdgeInsets(top: -4, left: -4, bottom: -4, right: -4)
let imageView = UIImageView(image: UIImage().withAlignmentRectInsets(insets))

UIButton

UIButtonにimageをセットした時のimage inset、及びUIButton自体のinset設定 
let button = UIButton(frame: CGRect())
let img = UIImage()
btn.setImage(img, for: .normal)
btn.imageEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
btn.contentEdgeInsets = UIEdgeInsets(top: 4, left: 4, bottom: 4, right: 4)

FYI

Human Interface Guideline Visual Design
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