一、基础

1.字符串替换
let value2 = value.replacingOccurrences(of: ";", with: "")

二、String与其他类型的相互转换

let str = "I am FlyElephant"
let array = str.components(separatedBy:" ")

let data = [1, 2, 3, 4, 5]
let dataStr = data.map(String.init)
let result = dataStr.joined(separator: ",")

let string = url.absoluteString
let url = URL(string: urlSting)

// Double转String,7位小数
let strVar = String.init(format: "%\(8)f° E   %\(8)f° N", userLocation.location.coordinate.latitude, userLocation.location.coordinate.longitude)

let data = "你好".data(using: String.defaultCStringEncoding)
let bytes = [UInt8](data)

let data = Data(bytes: bytes, count: bytes.count)
let typeString = data.string(encoding: .utf8) ?? ""

if let dataFromString = result?.data(using: .utf8, allowLossyConversion: false) {
    let json = try? JSON(data: dataFromString)
    ddPrint(json)
    
    guard let jsons = json else { return }
    
    let data = try? jsons.rawData()
    guard let dataTemp = data else {
        return
    }
    let decoder = JSONDecoder()
    do {
        let obj = try decoder.decode(LastResult.self, from: dataTemp)
        self.logisticsModel = obj
        self.table.reloadData()
    } catch {
        ddPrint("数据转化错误\(error)")
    }
    
}

三、计算文字宽度

// 动态计算Label宽度

   func getLabelWidth(str: String, font: UIFont, height: CGFloat)-> CGFloat {
        let statusLabelText: NSString = str as NSString
        let size = CGSize(width: CGFloat(MAXFLOAT), height: height)
        let strSize = statusLabelText.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font : font], context: nil).size
        return strSize.width    
    }