BFCommonKit/BFCommonKit/Classes/BFCategorys/BFNumber+Ext.swift

//
//  BFNumber+Ext.swift
//  PQSpeed
//
//  Created by SanW on 2020/7/20.
//  Copyright © 2020 BytesFlow. All rights reserved.
//

import Foundation

public extension Int {
    /// 分数字格式化如413200->4,132.09

    /// 是否保留2位小数
    /// - Parameter isDecimal: <#isDecimal description#>
    /// - Returns: <#description#>
    func paraseDecimalFormatterValue(isDecimal: Bool = false) -> String? {
        let decimal = self % 100
        let nonDecimal = self / 100
        let formatter = NumberFormatter()
        formatter.numberStyle = .decimal
        if let title = formatter.string(from: NSNumber(value: nonDecimal)) {
            if isDecimal {
                return title + String(format: ".%02d", decimal)
            } else {
                return title
            }
        }
        return nil
    }

    /// 改变单位为万
    /// @param originUnit <#originUnit description#>
    func changeUnit() -> String {
        var unitStr: String = ""
        if self < 10000 {
            unitStr = "\(self)"
        } else if self <= 1_000_000 {
            let divisor = pow(10.0, Double(1))
            let decimal = ((Double(self) / 10000) * divisor).rounded() / divisor
            unitStr = "\(decimal)万"
        } else {
            unitStr = "\(self / 10000)万"
        }
        return unitStr
    }
}

// MARK: - Float double类型扩展

extension Float {
    /// 准确的小数尾截取 - 没有进位
    /*
     // 11.999003  -> 12.0
     var pp = 11.999003
     String(format: "%.1f", pp)  这个方法会进行四舍五入
     */
    public func decimalString(_ base: Self = 1) -> String {
       return "\(self.decimalNumber(base))"
    }
    public func decimalNumber(_ base: Self = 1) -> Float {
        let tempCount: Self = pow(10, base)
        let temp = self*tempCount
        
        let target = Self(Int(temp))
        let stepone = target/tempCount
        if stepone.truncatingRemainder(dividingBy: 1) == 0 {
            return Float(String(format: "%.0f", stepone)) ?? 0.0
        }else{
            return stepone
        }
    }
}