最近用到的一些String的一些常用方法

string的Base64加密/解密

oc 加密

- (NSString *)base64EncodedString {
     NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
     return [data base64EncodedStringWithOptions:0];
}

oc解密

- (NSString *)base64DecodedString {

    NSData *data = [[NSData alloc]initWithBase64EncodedString:self options:0];

    return [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
}

swift 加密

// extension String
func base64EncodedString()->String{
      let utf8EncodeData:NSData! = self.data(using: String.Encoding.utf8, allowLossyConversion: true)  as NSData!
      return utf8EncodeData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue:0))
 }

swift 解密

// extension String
func base64DecodedString()->String {
  // 将base64字符串转换成NSData
         let base64EncodedData = NSData(base64Encoded:self,options:NSData.Base64DecodingOptions(rawValue: 0))
    // 对NSData数据进行UTF8解码
          return String.init(data: base64EncodedData as! Data, encoding: String.Encoding.utf8)!
}

oc字典转json字符串

+ (NSString *)dictionaryToJson:(NSDictionary *)dic {

       NSError *parseError = nil;

       NSData *jsonData    = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];

       return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}

swift字典转json字符串

func dictionaryToJson(dic:[String:Any])->String{  
    let data = try? JSONSerialization.data(withJSONObject: dic, options: [])
    return String(data:data!, encoding: String.Encoding.utf8)!
}

修改文字之间的间距

/// 修改文字之间的间距
///
/// - Parameters:
///   - string: 转化的文字
///   - space: 间距大小
/// - Returns:  NSMutableAttributedString
func getAttributedKernStringWithString(string:String ,space:CGFloat) -> NSAttributedString{
    let attString = NSMutableAttributedString(string: string)
    
    attString.addAttribute(NSKernAttributeName, value: space, range: NSRange(location:0,length:string.characters.count))
    return attString
}

计算文字宽度

/// 计算文字宽度
///
/// - Parameters:
///   - textStr: 传入的文字
///   - font: 字体
///   - height: 最大高度
/// - Returns: 文字宽度
static  func getTexWidth(textStr:String,font:UIFont,height:CGFloat) -> CGFloat {
    
    let normalText: NSString = textStr as NSString
    
    let size = CGSize(width:1000, height:height)
    
    let dic = NSDictionary(object: font, forKey: NSFontAttributeName as NSCopying)
    
    let stringSize = normalText.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: dic as? [String : AnyObject], context:nil).size
    
    return stringSize.width
    
}

计算文字高度

/// 计算文字高度
///
/// - Parameters:
///   - text: 要计算的文字
///   - font: 字体大小
///   - maxWid: label宽度
/// - Returns: 字体高度
func caculateTextHeight(text:String,font:UIFont,maxWid:CGFloat) -> CGFloat {
    let textSize = CGSize(width:maxWid,height:CGFloat.greatestFiniteMagnitude)
    let string = text as NSString
    let sizeFont = string.boundingRect(with: textSize, options: [.usesLineFragmentOrigin , .usesFontLeading , .usesDeviceMetrics] , attributes: [NSFontAttributeName:font], context: nil).size
    return ceil(sizeFont.height)
    
}

label设置有行距的AttributedString

/// label设置有行距的AttributedString
///
/// - Parameters:
///   - string: 要显示的string
///   - lineSpace: 行距
/// - Returns: NSMutableAttributedString
func getAttributedStringWithString(string:String ,lineSpace:CGFloat) -> NSAttributedString{
    let attString = NSMutableAttributedString(string: string)
    let style = NSMutableParagraphStyle()
    style.lineSpacing = lineSpace
    let range = NSMakeRange(0, string.characters.count)
    attString.addAttribute(NSParagraphStyleAttributeName, value: style, range: range)
    return attString
}

多种颜色文本

/// 多种颜色文本
///
/// - Parameters:
///   - string: 要转换的文本
///   - fromIndex: 开始的位置
///   - length: 长度
///   - font: 字体
///   - color: 颜色
/// - Returns: 文本
func changeTextColor(string:String,fromIndex:NSInteger,length:NSInteger,font:UIFont,color:UIColor) -> NSAttributedString {
    let attrubuteStr =  NSMutableAttributedString.init(string: string)
    attrubuteStr.addAttributes([NSFontAttributeName:font,NSForegroundColorAttributeName:color], range: NSRange(location:fromIndex,length:length))
    return attrubuteStr
}

手机号验证

func isTelNumber(num:String)->Bool{
    let mobile = "^1((3[0-9]|4[57]|5[0-35-9]|7[0678]|8[0-9])\\d{8}$)"
    let  CM = "(^1(3[4-9]|4[7]|5[0-27-9]|7[8]|8[2-478])\\d{8}$)|(^1705\\d{7}$)"
    let  CU = "(^1(3[0-2]|4[5]|5[56]|7[6]|8[56])\\d{8}$)|(^1709\\d{7}$)"
    let  CT = "(^1(33|53|77|8[019])\\d{8}$)|(^1700\\d{7}$)"
    let regextestmobile = NSPredicate(format: "SELF MATCHES %@",mobile)
    let regextestcm = NSPredicate(format: "SELF MATCHES %@",CM )
    let regextestcu = NSPredicate(format: "SELF MATCHES %@" ,CU)
    let regextestct = NSPredicate(format: "SELF MATCHES %@" ,CT)
    if ((regextestmobile.evaluate(with: num) == true)
        || (regextestcm.evaluate(with: num)  == true)
        || (regextestct.evaluate(with: num) == true)
        || (regextestcu.evaluate(with: num) == true))
    {
        return true
    }
    else
    {
        return false
    }
}