我正在使用两个NSMutableAttributedString,并从这两个中创建一个NSMutableAttributedString。我想限制两个attributedString的最大行数的不同。我进行了很多搜索,但没有找到任何可行的方法和不错的选择。
let linkTitleAttributed = NSMutableAttributedString(string: message.getLinkTitle() ?? "" , attributes: [NSFontAttributeName: UIFont.systemFontOfSize(19.0)])
//linkTitleAttributed should be maximum 2 lines.
let linkDescAttributed = NSAttributedString(string: message.getLinkDescription() ?? "", attributes: [NSFontAttributeName: UIFont.systemFontOfSize(15.0)])
//linkDescAttributed should be maximum 5 lines.
let finalAttributed = NSMutableAttributedString()
final.append(linkTitleAttributed)
final.append(linkDescAttributed)
如果文本多于一行,则该文本应以“ Lorem Ipsum只是伪文本...”结尾
我想到一个解决方案(将文本独立设置为textview并获得可见范围),但我正在寻找更好的解决方案。 谢谢。
答案 0 :(得分:0)
您必须处理标题和描述的字符串,然后创建一个新的
NSAttributedString
。像这样:
func limitNumLines(_ msg: String, max: Int) -> String{
if max <= 0 { return "" }
let lines = msg.components(separatedBy: "\n")
var output = ""
for i in 0..<max {
output += lines[i] + "\n"
}
return output
}
let titleMessage = "LINE1\nLINE2\nLINE3\nLINE4"
let descMessage = "line1\nline2\nline3\nline4\nline5\nline6"
//linkTitleAttributed (that is, message) should be maximum 2 lines.
let title = limitNumLines(titleMessage, max: 2)
let linkTitleAttributed = NSMutableAttributedString(string: title , attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 19.0)])
//linkDescAttributed should be maximum 5 lines.
let desc = limitNumLines(descMessage, max: 5)
let linkDescAttributed = NSAttributedString(string: desc , attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 15.0)])
let finalAttributed = NSMutableAttributedString()
finalAttributed.append(linkTitleAttributed)
finalAttributed.append(linkDescAttributed)