swift 自定义一个可设置 text 的垂直位置的 Label

概述常用于要求 label 文字上部与图片上部对齐的场景 import UIKitenum VerticalAlignment{ case VerticalAlignmentTop//default case VerticalAlignmentMiddle case VerticalAlignmentBottom}class VerticalLabel: UILa

常用于要求 label 文字上部与图片上部对齐的场景

import UIKitenum VerticalAlignment{    case VerticalAlignmenttop//default    case VerticalAlignmentMIDdle    case VerticalAlignmentBottom}class VerticalLabel: UILabel{    var verticalAlignment: VerticalAlignment = .VerticalAlignmenttop {        dIDSet {            self.setNeedsdisplay()        }    }        overrIDe init(frame: CGRect) {        super.init(frame: frame)        self.verticalAlignment = VerticalAlignment.VerticalAlignmenttop    }        required init(coder aDecoder: NSCoder) {        super.init(coder: aDecoder)!    }        overrIDe func textRect(forBounds bounds: CGRect,limitedToNumberOflines numberOflines: Int) -> CGRect {        var superRect:CGRect = super.textRect(forBounds: bounds,limitedToNumberOflines: numberOflines)        switch self.verticalAlignment {        case VerticalAlignment.VerticalAlignmenttop:            superRect.origin.y = bounds.origin.y        case VerticalAlignment.VerticalAlignmentBottom:            superRect.origin.y = bounds.origin.y + bounds.size.height  - superRect.size.height        case VerticalAlignment.VerticalAlignmentMIDdle:            superRect.origin.y = bounds.origin.y + (bounds.size.height - superRect.size.height) / 2        }        return superRect    }    overrIDe func drawText(in rect: CGRect) {        let rect:CGRect = self.textRect(forBounds: rect,limitedToNumberOflines: self.numberOflines)        super.drawText(in: rect)    }}

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