class AttributeStringGenerator {
var attributeString: NSMutableAttributedString!
var lineSpacing: CGFloat = 2
init() {
attributeString = NSMutableAttributedString()
}
func reset() {
attributeString = NSMutableAttributedString()
}
/// 添加空行
func addEmptyLine(height: CGFloat = 12) {
let font = UIFont.systemFont(ofSize: height)
let attr = NSAttributedString(string: "\n", attributes: [NSAttributedString.Key.font:font])
attributeString.append(attr)
}
/// 加一行文字
///
/// - Parameters:
/// - string: 要加的文字
/// - alignment: 对齐方式
/// - color: 颜色
/// - font: 字体
/// - isLastLine: 是否最后一行,最后一行不加换行
func addLine(string: String, alignment: NSTextAlignment, color: UIColor = UIColor.white, font: UIFont = UIFont.systemFont(ofSize: 12), isLastLine: Bool = false) {
let para = NSMutableParagraphStyle()
para.alignment = alignment
para.lineSpacing = lineSpacing
//如果是最后一行,不需要加 \n
var s = string
if !isLastLine {
s += "\n"
}
let attr = NSAttributedString(string: s, attributes:
[NSAttributedString.Key.paragraphStyle:para,
NSAttributedString.Key.foregroundColor:color,
NSAttributedString.Key.font:font])
attributeString.append(attr)
}
/// 添加文字居中带图标的行
///
/// - Parameters:
/// - icon: 图标
/// - string: 文字
/// - size: 图标大小
/// - color: 文字颜色
/// - font: 字体
/// - isLastLine: 是否最后一行
func addLineWith(icon: UIImage,string: String, size: CGSize, color: UIColor = UIColor.white, font: UIFont = UIFont.systemFont(ofSize: 18), isLastLine: Bool = true) {
let para = NSMutableParagraphStyle()
para.alignment = .center
para.lineSpacing = lineSpacing
//如果是最后一行,不需要加 \n
var s = string
if !isLastLine {
s += "\n"
}
let att = NSTextAttachment(data: nil, ofType: nil)
att.image = icon
att.bounds = CGRect(x: 0, y: -font.pointSize/10, width: size.width, height: size.height)
let attr = NSMutableAttributedString(attributedString: NSAttributedString(attachment: att))
attr.append(NSMutableAttributedString(string: " " + s, attributes:
[NSAttributedString.Key.foregroundColor:color,
NSAttributedString.Key.font:font]))
attr.addAttribute(NSAttributedString.Key.paragraphStyle, value: para, range: NSMakeRange(0, attr.length))
attributeString.append(attr)
}
/// 添加一行文字,分左中右三部分, 左边的左对齐, 中间的右对齐,可以设置通过某符号对齐,比如 ":", 右边的可以自行设置对齐方式
///
/// - Parameters:
/// - leftString: 左边的文字
/// - leftColor: 左边文字的颜色
/// - leftFont: 左边文字字体
/// - centerString: 中间的文字
/// - centerPosition: 中间文字的位置
/// - centerColor: 中间文字颜色
/// - centerFont: 中间文字字体
/// - alignString: 中间文字对齐的符号
/// - rightString: 右边的文字
/// - rightPosition: 右边文字的位置
/// - rightColor: 右边文字颜色
/// - rightFont: 右边文字字体
/// - alignment: 右边文字对齐方式
func addLine(leftString: String?, leftColor: UIColor = UIColor.white, leftFont: UIFont = UIFont.systemFont(ofSize: 12),
centerString: String? = nil,centerPosition:CGFloat = 0, centerColor: UIColor = UIColor.white, centerFont: UIFont = UIFont.systemFont(ofSize: 12), alignString: String = "",
rightString: String?,rightPosition:CGFloat = 0, rightColor: UIColor = UIColor.white, rightFont: UIFont = UIFont.systemFont(ofSize: 12), alignment: NSTextAlignment = .right,
isLastLine: Bool = false) {
var string = ""
var leftRange: NSRange
var centerRange: NSRange
var rightRange: NSRange
if let left = leftString {
string = string + left + "\t"
//特殊字符.count算出的长度不对,需要改成 lengthOfBytes(using: String.Encoding.unicode)/2
leftRange = NSMakeRange(0, string.lengthOfBytes(using: String.Encoding.unicode)/2)
} else {
string += "\t"
leftRange = NSMakeRange(0, 1)
}
if let center = centerString {
string = string + center + "\t"
centerRange = NSMakeRange(leftRange.length, center.lengthOfBytes(using: String.Encoding.unicode)/2 + 1)
} else {
//string += "\t"
centerRange = NSMakeRange(leftRange.length, 0)
}
if let right = rightString {
if isLastLine {
string = string + right
rightRange = NSMakeRange(leftRange.length + centerRange.length, right.lengthOfBytes(using: String.Encoding.unicode)/2)
} else {
string = string + right + "\n"
rightRange = NSMakeRange(leftRange.length + centerRange.length, right.lengthOfBytes(using: String.Encoding.unicode)/2 + 1)
}
} else {
if isLastLine {
string += "\n"
rightRange = NSMakeRange(leftRange.length + centerRange.length, 1)
} else {
rightRange = NSMakeRange(leftRange.length + centerRange.length, 0)
}
}
let para = NSMutableParagraphStyle()
para.lineSpacing = lineSpacing
let align = NSCharacterSet(charactersIn: alignString)
let t1 = NSTextTab(textAlignment: .right, location: centerPosition, options: [NSTextTab.OptionKey.columnTerminators:align])
let t2 = NSTextTab(textAlignment: alignment, location: rightPosition, options: [:])
para.tabStops = [t1,t2]
if centerString == nil {
para.tabStops = [t2]
}
let attr = NSMutableAttributedString(string: string)
attr.addAttribute(NSAttributedString.Key.paragraphStyle, value: para, range: NSMakeRange(0, string.count))
attr.addAttributes([NSAttributedString.Key.foregroundColor:leftColor, NSAttributedString.Key.font:leftFont], range: leftRange)
attr.addAttributes([NSAttributedString.Key.foregroundColor:centerColor, NSAttributedString.Key.font:centerFont], range: centerRange)
attr.addAttributes([NSAttributedString.Key.foregroundColor:rightColor, NSAttributedString.Key.font:rightFont], range: rightRange)
attributeString.append(attr)
}
func getHeight(width:CGFloat) -> CGFloat {
let options : NSStringDrawingOptions = [.usesLineFragmentOrigin, .usesFontLeading]
let bounds = attributeString.boundingRect(with: CGSize(width: width, height: 99999), options: options, context: nil)
return bounds.height
}
}
最后将attributeString赋值给label