不是＆＃39; /＆＃39;候选人产生预期的情境结果类型＆＃39; NSNumber＆＃39;

Question

我刚刚更新到swift 3并得到了这个问题。

let percentString = NumberFormatter.localizedString(
        from: Double(correctGuesses) / Double(totalGuesses),
        number: NumberFormatter.Style.percent)

Answer 1

var correctGuesses = 10
var totalGuesses = 20

var result = NSNumber(value: correctGuesses / totalGuesses)

let percentString = NumberFormatter.localizedString(
  from: result,
  number: NumberFormatter.Style.percent
)

Answer 2

或者简单地说，不添加另一个var

let percentString = NumberFormatter.localizedString(
from: NSNumber(value: Double(correctGuesses) / Double(totalGuesses)),
number: NumberFormatter.Style.percent)