找不到类型 'String' 的初始值设定项，它接受类型为 '(format: String, argument: UInt32

Question

我在 Xcode 6.3 (6D570) 中创建了一个游乐场并输入以下代码：

import UIKit
var randum_num = arc4random_uniform(13) + 1
String(format: "card%i", arguments: randum_num)

我得到了这个错误：

cannot find an initializer for type 'String' that accepts an argument list of type '(format: String, argument: UInt32

抱歉，我是 Swift 的新手，感谢您的任何建议！

P.S。我正在学习本教程：link

Answer 1

您只需省略 "arguments:"。像这样尝试：

let randum_num = arc4random_uniform(13) + 1
String(format: "card%i",  randum_num)

或者干脆

String(format: "card%i",  arc4random_uniform(13) + 1)

cannot find an initializer for type 'String' that accepts an argument list of type '(format: String, argument: UInt32