Linux 上的 Swift NSString 到 String

Question

在文档中我找到了文章:https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/WorkingWithCocoaDataTypes.html

还有一个代码:

import Foundation
let myString: NSString = "123"
if let integerValue = Int(myString as String) {
    print("\(myString) is the integer \(integerValue)")
}
// prints "123 is the integer 123"

在 MacOS 上可以，但在 Lunux 上不行。我收到一个错误:

error: cannot convert value of type 'NSString' to type 'String' in coercion if let integerValue = Int(myString as String) {

Answer 1

无法访问 Linux 编译器……我建议采用以下解决方法。

let myString: NSString = "123"
if let integerValue = Int(String(myString)) {
    print("\(myString) is the integer \(integerValue)")
}

或

let myString: NSString = "123"
if myString.isEqualToString("0") || myString.integerValue != 0 {
    print("\(myString) is the integer \(myString.integerValue)")
}