为标签创建了一个插座，并获取了一个由.""分隔的三个句子组成的字符串。所附图像中的内容将是此字符串。请尝试使用replacingOccurences（）函数，如下所示。

@IBOutlet weak var trialLabel: UILabel!

var string = "This is a trial text.Let us jump to a new line when the full stop is encountered.Hope it helps."

string = string.replacingOccurrences(of: ".", with: ".\n")
trialLabel.text = string

检查https://developer.apple.com/documentation/foundation/nsstring/1412937-replacingoccurrences以获得进一步的参考。快乐编码！！

你可以通过UIClable的属性文本属性来实现，试着找到并用html换行符替换字符，然后把这个文本赋给UIClable属性文本。
可以将字符串替换为

let str = "This is the string to be replaced by a new string"
let replacedStr = str.replacingOccurrences(of: "string", with: "str")

使用下面的代码// HTML标记删除方法

extension String{

    func removeHtmlFromString(inPutString: String) -> String{

        return inPutString.replacingOccurrences(of: ".", with: ".\n", options: .regularExpression, range: nil)
    }
}

   let str = "Lorem Ipsum is simply dummy text.Lorem Ipsum has been the industry's standard dummy text ever since the 1500."

  let postDiscription = str!.removeHtmlFromString(inPutString: str!)

可以在文本字符串中要创建换行符的位置添加\n。