在 Swift 3 中将属性字符串替换为 NSMutableAttributedString答案

【问题标题】：Replace attributed string into NSMutableAttributedString In Swift 3在 Swift 3 中将属性字符串替换为 NSMutableAttributedString
【发布时间】：2018-02-05 08:11:51
【问题描述】：

我想像这样输出

我的名字是 Pramod 塔帕尼亚

从下面的 json.

{
    "text": "My name is B0$ Tapaniya.",
    "formats": {
            "formatId": [
                "B0$"
            ],
            "formatValue": [
                "Pramod"
            ]
    }
}

我尝试了下面的代码，但是因为我用属性字符串替换了字符串，所以出现了编译时错误。我使用 SwiftyJson 处理 json。

let boldAttributes = [NSForegroundColorAttributeName: UIColor.white, NSFontAttributeName: UIFont.boldSystemFont(ofSize: 13)]
let simpleAttributes = [NSForegroundColorAttributeName: UIColor.lightGray, NSFontAttributeName: UIFont.systemFont(ofSize: 13)]

let strComm = NSMutableAttributedString(string: dict["text"].stringValue, attributes: simpleAttributes)
let attributedStr = NSMutableAttributedString()

attributedStr.append(strComm)

let arrFormatId = dict["formats"]["formatId"]
let arrFormatValue = dict["formats"]["formatValue"]

for var i in 0..<arrFormatId.count{
    let strBold = NSMutableAttributedString(string: arrFormatValue[i].stringValue, attributes: boldAttributes)
    attributedStr.mutableString.replaceOccurrences(of: arrFormatId[i].stringValue, with: strBold, options: .caseInsensitive, range: NSRange(location: 0, length: attributedStr.length)) //Cannot convert value of type 'NSMutableAttributedString' to expected argument type 'String'
}
return attributedStr

【问题讨论】：

标签： ios json string swift3 nsattributedstring

【解决方案1】：

用这个代码替换

let boldAttributes = [NSForegroundColorAttributeName: UIColor.white, NSFontAttributeName: UIFont.boldSystemFont(ofSize: 13)]
let simpleAttributes = [NSForegroundColorAttributeName: UIColor.lightGray, NSFontAttributeName: UIFont.systemFont(ofSize: 13)]

let strComm = NSMutableAttributedString(string: dict["text"].stringValue, attributes: simpleAttributes)
let attributedStr = NSMutableAttributedString()

attributedStr.append(strComm)

let arrFormatId = dict["formats"]["formatId"]
let arrFormatValue = dict["formats"]["formatValue"]

for var i in 0..<arrFormatId.count{
    let strBold = NSMutableAttributedString(string: arrFormatValue[i].stringValue, attributes: boldAttributes)
    while attributedStr.mutableString.contains(arrFormatId[i].stringValue) {
        let range = attributedStr.mutableString.range(of: arrFormatId[i].stringValue)
        attributedStr.replaceCharacters(in: range, with: strBold)
    }
}
return attributedStr

【讨论】：

【解决方案2】：

简单的解决方案是

var text = "My name is B0$ Tapaniya"
var arrayID = ["B0$"]

var arrayValue =  ["Pramod"]

if arrayID.count == arrayValue.count {
    for key in arrayID {
        text = text.replacingOccurrences(of: key, with:arrayValue[arrayID.index(of: key)!])
    }

 // Now use below methods

    let formattedString = NSMutableAttributedString()
    formattedString
   .normal(text)
   .bold(arrayValue.joined(separator: ","))   

}

来自https://stackoverflow.com/a/37992022/4601900

extension NSMutableAttributedString {
    @discardableResult func bold(_ text:String) -> NSMutableAttributedString {
        let attrs = [NSForegroundColorAttributeName: UIColor.white, NSFontAttributeName: UIFont.boldSystemFont(ofSize: 13)]

        let boldString = NSMutableAttributedString(string:"\(text)", attributes:attrs)
        self.append(boldString)
        return self
    }

    @discardableResult func normal(_ text:String)->NSMutableAttributedString {
        let normal =  NSAttributedString(string: text)
        self.append(normal)
        return self
    }
}

【讨论】：

【解决方案3】：

请试试这个：

var testDict = ["text": "My name is B0$ Tapaniya.","formats": ["formatId": ["B0$"],"formatValue": ["Pramod"]]] as [String : AnyObject]
let attrString = NSMutableAttributedString(string: testDict["text"] as! String)
var formatIDS = testDict["formats"]?.value(forKey: "formatId") as! [String]
var formatValues = testDict["formats"]?.value(forKey: "formatValue") as! [String]

for i in 0..<formatIDS.count {
    attrString.mutableString.replaceOccurrences(of: formatIDS[i], with: formatValues[i], options: NSString.CompareOptions.caseInsensitive, range: NSRange(location: 0, length: attrString.length))
    attrString.addAttributes([NSFontAttributeName: UIFont.boldSystemFont(ofSize: 12.0)], range: attrString.mutableString.range(of: formatValues[i] as String))
}
print(attrString)

【讨论】：

“Pramod”为粗体。您只需替换字符串。
更新了答案。