扩展双轮斯威夫特3

Question

的地方，我有以下扩展

extension Double { 
    func roundToPlaces(places:Int) -> Double { 
     let divisor = pow(10.0, Double(places)) 
     return (self * divisor).rounded/divisor 
    } 
} 

当我将其更新到斯威夫特3，这是行不通的。我试图解决here，但我得到了

Binary operator '/' cannot be applied to operands of type '_' and 'Double'错误

Answer 1

你忘了一个括号：应该是rounded()而不是rounded：

extension Double { 
    func roundToPlaces(places:Int) -> Double { 
     let divisor = pow(10.0, Double(places)) 
     return (self * divisor).rounded()/divisor 
    } 
}