如图所示，我有代码在屏幕上绘制文本。textalign函数仅支持水平对齐。现在，我要添加对垂直对齐的支持。有人能帮我一下吗？
代码
func textAlign(_ horizonalAlign: String, _ verticalAlign: String? = nil){
settings.textAlignment = horizonalAlign
}
func text(_ str: String, _ x: CGFloat, _ y: CGFloat, _ x2: CGFloat? = nil, _ y2: CGFloat? = nil) {
let fontSizeWidthRatio: CGFloat = 1.8
let paragraphStyle = NSMutableParagraphStyle()
var align: NSTextAlignment!
switch settings.textAlignment {
case LEFT:
align = .left
case RIGHT:
align = .right
case CENTER:
align = .center
default:
align = .left
}
paragraphStyle.alignment = align
let attributes: [NSAttributedString.Key: Any] = [
.paragraphStyle: paragraphStyle,
.font: UIFont(name: settings.textFont, size: settings.textSize)!,
.foregroundColor: settings.fill.uiColor(),
.strokeWidth: -settings.strokeWeight,
.strokeColor: settings.stroke.uiColor(),
.baselineOffset: y,
]
if x2 == nil {
str.draw(at: CGPoint(x: x, y: y), withAttributes: attributes)
}else{
str.draw(with: CGRect(x: x, y: y, width: (x2 != nil) ? x2! : width, height: (y2 != nil) ? y2! : height), options: .usesLineFragmentOrigin, attributes: attributes, context: nil)
}
}
正如Larme所建议的，你应该直接发布你的代码，这样更容易阅读，而且...复制粘贴：d
所以我的意见是，自己根据一个自定义枚举来计算字符串的rect：
enum VerticalAlign {
case top
case center
case bottom
}
当然，这意味着如果从cgpoint中绘制，则只能在cgrect中绘制，则不能使用这种对齐方式。
你的功能会变成这样：
func text(_ str: String, _ x: CGFloat, _ y: CGFloat, _ x2: CGFloat? = nil, _ y2: CGFloat? = nil, _ verticalAlign: VerticalAlign) {
// Add your paragrapheStyle and horizontal alignment here
// ...
// ...
// ... and set your attributes
let attributes: [NSAttributedString.Key: Any] = [
.font: UIFont.systemFont(ofSize: 18.0),
.foregroundColor: UIColor.red
]
let hardcodedHeightValue: CGFloat = 20.0
// Vertical alignment can be only used if you draw in rect (so in your example, its only if you have a width)
if let width = x2 {
let height = y2 ?? hardcodedHeightValue
let size = str.size(withAttributes: attributes)
let centeredRect: CGRect
switch verticalAlign {
case .top:
centeredRect = CGRect(x: x,
y: y,
width: width,
height: size.height)
case .center:
centeredRect = CGRect(x: x,
y: y + height * 0.5 - size.height * 0.5,
width: width,
height: size.height)
case .bottom:
centeredRect = CGRect(x: x,
y: y + height - size.height,
width: width,
height: size.height)
}
str.draw(in: centeredRect, withAttributes: attributes)
} else {
str.draw(at: CGPoint(x: x, y: y), withAttributes: attributes)
}
}
