[iphone] UIButton의 텍스트 및 이미지를 imageEdgeInsets 및 titleEdgeInsets와 정렬

나는이 파티에도 약간 늦었지만 추가 할 유용한 것이 있다고 생각합니다 : o).

UIButton버튼의 이미지가 세로 또는 가로로 레이아웃되는 위치를 선택할 수 있도록 서브 클래스를 만들었습니다 .

이런 종류의 버튼을 만들 수 있음을 의미합니다.

내 클래스로 이러한 버튼을 만드는 방법에 대한 자세한 내용은 다음과 같습니다.

func makeButton (imageVerticalAlignment:LayoutableButton.VerticalAlignment, imageHorizontalAlignment:LayoutableButton.HorizontalAlignment, title:String) -> LayoutableButton {
    let button = LayoutableButton ()

    button.imageVerticalAlignment = imageVerticalAlignment
    button.imageHorizontalAlignment = imageHorizontalAlignment

    button.setTitle(title, for: .normal)

    // add image, border, ...

    return button
}

let button1 = makeButton(imageVerticalAlignment: .center, imageHorizontalAlignment: .left, title: "button1")
let button2 = makeButton(imageVerticalAlignment: .center, imageHorizontalAlignment: .right, title: "button2")
let button3 = makeButton(imageVerticalAlignment: .top, imageHorizontalAlignment: .center, title: "button3")
let button4 = makeButton(imageVerticalAlignment: .bottom, imageHorizontalAlignment: .center, title: "button4")
let button5 = makeButton(imageVerticalAlignment: .bottom, imageHorizontalAlignment: .center, title: "button5")
button5.contentEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

이를 위해, 나는 2 개 속성을 추가 : imageVerticalAlignment와 imageHorizontalAlignment. 물론, 버튼에 이미지 나 제목 만있는 경우에는이 클래스를 전혀 사용하지 마십시오!

또한 이름이 지정된 속성을 추가했습니다. imageToTitleSpacing제목과 이미지 사이의 간격을 조정할 수 .

이 클래스를 사용하려는 경우 호환 될 수 있도록 최선을 노력 imageEdgeInsets, titleEdgeInsets그리고 contentEdgeInsets새로운 레이아웃 속성을 직접 또는 combinaison에.

@ravron이 설명했듯이 버튼 내용을 올바르게 만들기 위해 최선을 다합니다 (빨간색 테두리로 볼 수 있듯이).

Interface Builder에서도 사용할 수 있습니다.

1. UIButton 만들기
2. 버튼 클래스 변경
3. “중앙”, “상단”, “하단”, “왼쪽”또는 “오른쪽”을 사용하여 레이아웃 가능 속성 조정

여기 코드 ( 장점 ) :

@IBDesignable
class LayoutableButton: UIButton {

    enum VerticalAlignment : String {
        case center, top, bottom, unset
    }


    enum HorizontalAlignment : String {
        case center, left, right, unset
    }


    @IBInspectable
    var imageToTitleSpacing: CGFloat = 8.0 {
        didSet {
            setNeedsLayout()
        }
    }


    var imageVerticalAlignment: VerticalAlignment = .unset {
        didSet {
            setNeedsLayout()
        }
    }

    var imageHorizontalAlignment: HorizontalAlignment = .unset {
        didSet {
            setNeedsLayout()
        }
    }

    @available(*, unavailable, message: "This property is reserved for Interface Builder. Use 'imageVerticalAlignment' instead.")
    @IBInspectable
    var imageVerticalAlignmentName: String {
        get {
            return imageVerticalAlignment.rawValue
        }
        set {
            if let value = VerticalAlignment(rawValue: newValue) {
                imageVerticalAlignment = value
            } else {
                imageVerticalAlignment = .unset
            }
        }
    }

    @available(*, unavailable, message: "This property is reserved for Interface Builder. Use 'imageHorizontalAlignment' instead.")
    @IBInspectable
    var imageHorizontalAlignmentName: String {
        get {
            return imageHorizontalAlignment.rawValue
        }
        set {
            if let value = HorizontalAlignment(rawValue: newValue) {
                imageHorizontalAlignment = value
            } else {
                imageHorizontalAlignment = .unset
            }
        }
    }

    var extraContentEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var contentEdgeInsets: UIEdgeInsets {
        get {
            return super.contentEdgeInsets
        }
        set {
            super.contentEdgeInsets = newValue
            self.extraContentEdgeInsets = newValue
        }
    }

    var extraImageEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var imageEdgeInsets: UIEdgeInsets {
        get {
            return super.imageEdgeInsets
        }
        set {
            super.imageEdgeInsets = newValue
            self.extraImageEdgeInsets = newValue
        }
    }

    var extraTitleEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var titleEdgeInsets: UIEdgeInsets {
        get {
            return super.titleEdgeInsets
        }
        set {
            super.titleEdgeInsets = newValue
            self.extraTitleEdgeInsets = newValue
        }
    }

    //Needed to avoid IB crash during autolayout
    override init(frame: CGRect) {
        super.init(frame: frame)
    }


    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        self.imageEdgeInsets = super.imageEdgeInsets
        self.titleEdgeInsets = super.titleEdgeInsets
        self.contentEdgeInsets = super.contentEdgeInsets
    }

    override func layoutSubviews() {
        if let imageSize = self.imageView?.image?.size,
            let font = self.titleLabel?.font,
            let textSize = self.titleLabel?.attributedText?.size() ?? self.titleLabel?.text?.size(attributes: [NSFontAttributeName: font]) {

            var _imageEdgeInsets = UIEdgeInsets.zero
            var _titleEdgeInsets = UIEdgeInsets.zero
            var _contentEdgeInsets = UIEdgeInsets.zero

            let halfImageToTitleSpacing = imageToTitleSpacing / 2.0

            switch imageVerticalAlignment {
            case .bottom:
                _imageEdgeInsets.top = (textSize.height + imageToTitleSpacing) / 2.0
                _imageEdgeInsets.bottom = (-textSize.height - imageToTitleSpacing) / 2.0
                _titleEdgeInsets.top = (-imageSize.height - imageToTitleSpacing) / 2.0
                _titleEdgeInsets.bottom = (imageSize.height + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.top = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.bottom = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
            case .top:
                _imageEdgeInsets.top = (-textSize.height - imageToTitleSpacing) / 2.0
                _imageEdgeInsets.bottom = (textSize.height + imageToTitleSpacing) / 2.0
                _titleEdgeInsets.top = (imageSize.height + imageToTitleSpacing) / 2.0
                _titleEdgeInsets.bottom = (-imageSize.height - imageToTitleSpacing) / 2.0
                _contentEdgeInsets.top = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.bottom = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
            case .center:
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
                break
            case .unset:
                break
            }

            switch imageHorizontalAlignment {
            case .left:
                _imageEdgeInsets.left = -halfImageToTitleSpacing
                _imageEdgeInsets.right = halfImageToTitleSpacing
                _titleEdgeInsets.left = halfImageToTitleSpacing
                _titleEdgeInsets.right = -halfImageToTitleSpacing
                _contentEdgeInsets.left = halfImageToTitleSpacing
                _contentEdgeInsets.right = halfImageToTitleSpacing
            case .right:
                _imageEdgeInsets.left = textSize.width + halfImageToTitleSpacing
                _imageEdgeInsets.right = -textSize.width - halfImageToTitleSpacing
                _titleEdgeInsets.left = -imageSize.width - halfImageToTitleSpacing
                _titleEdgeInsets.right = imageSize.width + halfImageToTitleSpacing
                _contentEdgeInsets.left = halfImageToTitleSpacing
                _contentEdgeInsets.right = halfImageToTitleSpacing
            case .center:
                _imageEdgeInsets.left = textSize.width / 2.0
                _imageEdgeInsets.right = -textSize.width / 2.0
                _titleEdgeInsets.left = -imageSize.width / 2.0
                _titleEdgeInsets.right = imageSize.width / 2.0
                _contentEdgeInsets.left = -((imageSize.width + textSize.width) - max (imageSize.width, textSize.width)) / 2.0
                _contentEdgeInsets.right = -((imageSize.width + textSize.width) - max (imageSize.width, textSize.width)) / 2.0
            case .unset:
                break
            }

            _contentEdgeInsets.top += extraContentEdgeInsets.top
            _contentEdgeInsets.bottom += extraContentEdgeInsets.bottom
            _contentEdgeInsets.left += extraContentEdgeInsets.left
            _contentEdgeInsets.right += extraContentEdgeInsets.right

            _imageEdgeInsets.top += extraImageEdgeInsets.top
            _imageEdgeInsets.bottom += extraImageEdgeInsets.bottom
            _imageEdgeInsets.left += extraImageEdgeInsets.left
            _imageEdgeInsets.right += extraImageEdgeInsets.right

            _titleEdgeInsets.top += extraTitleEdgeInsets.top
            _titleEdgeInsets.bottom += extraTitleEdgeInsets.bottom
            _titleEdgeInsets.left += extraTitleEdgeInsets.left
            _titleEdgeInsets.right += extraTitleEdgeInsets.right

            super.imageEdgeInsets = _imageEdgeInsets
            super.titleEdgeInsets = _titleEdgeInsets
            super.contentEdgeInsets = _contentEdgeInsets

        } else {
            super.imageEdgeInsets = extraImageEdgeInsets
            super.titleEdgeInsets = extraTitleEdgeInsets
            super.contentEdgeInsets = extraContentEdgeInsets
        }

        super.layoutSubviews()
    }
}