swift中取整1.005的问题
1.005四舍五入到小数点后两位，结果是1.0，而不是1.01，如何求解？
for i in 1..<11 {
let value = Double(i) + 0.005
let roundedValue = round(value * 100) / 100.0
print(value, roundedValue)
}
输出：
1.005 -> 1.0
2.005 -> 2.01
3.005 -> 3.01
4.005 -> 4.01
5.005 -> 5.01
6.005 -> 6.01
7.005 -> 7.01
8.005 -> 8.01
9.005 -> 9.01
10.005 -> 10.01
只需使用NumberFormatter并将RoundingMode设置为Halfup:
extension Formatter {
static let number: NumberFormatter = {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.minimumFractionDigits = 2
formatter.maximumFractionDigits = 2
formatter.roundingMode = .halfUp
return formatter
}()
}
Formatter.number.string(for: 1.005) // "1.01"
Formatter.number.string(for: 2.005) // "1.01"
Formatter.number.string(for: 3.005) // "1.01"
Formatter.number.string(for: 4.005) // "1.01"
Formatter.number.string(for: 5.005) // "1.01"
Formatter.number.string(for: 6.005) // "1.01"
Formatter.number.string(for: 7.005) // "1.01"
Formatter.number.string(for: 8.005) // "1.01"
Formatter.number.string(for: 9.005) // "1.01"
Formatter.number.string(for: 10.005) // "1.01"
