迅速3错误:参数标签'(_ :)'与任何可用的重载都不匹配 [英] swift 3 error : Argument labels '(_:)' do not match any available overloads

问题描述

仅将项目转换为Swift 3并无法找出以下错误.

Just converted a project to Swift 3 and cant figure out the following error.

public func currencyString(_ decimals: Int) -> String {

    let formatter = NumberFormatter()
    formatter.numberStyle = .currency
    formatter.maximumFractionDigits = decimals
    return formatter.string(from: NSNumber(self))!
}

返回行显示错误参数标签'(_ :)'与任何可用的重载都不匹配"

the return line is showing an error "Argument labels '(_:)' do not match any available overloads"

任何想法都需要更改以解决此问题

Any idea what needs to change to resolve this

推荐答案

您可以这样做:

public func currencyString(_ decimals: Int) -> String {

    let formatter = NumberFormatter()
    formatter.numberStyle = .currency
    formatter.maximumFractionDigits = decimals
    return formatter.string(from: NSNumber(value: decimals))!
}

因为如果选中 NSNumber ，您将获得预定义的init，例如:

Because if you check NSNumber you will get predefined init like:

public init(value: Int)

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