3
我试图将以下代码从此库(https://github.com/dankogai/swift-json)转换为Swift 3兼容代码。Swift 2 to 3 Migration String.fromCString
有关于fromCString
功能,这在以前对斯威夫特2
错误字符串提供错误的众多大致相同无处不在:
“fromCString”是不可用:请使用String.init?(validatingUTF8 :)来代替。请注意,它不再接受NULL作为有效输入。另外考虑使用String(cString :),它将尝试修复不合格的代码单元。
看到我有2个选择可供选择我不确定给出原作者意图的正确的一个。
例如这里有一个错误代码片段。
extension JSON : CustomStringConvertible {
/// stringifies self.
/// if pretty:true it pretty prints
public func toString(pretty:Bool=false)->String {
switch _value {
case is NSError: return "\(_value)"
case is NSNull: return "null"
case let o as NSNumber:
switch String.fromCString(o.objCType)! {
case "c", "C":
return o.boolValue.description
case "q", "l", "i", "s":
return o.int64Value.description
case "Q", "L", "I", "S":
return o.uint64Value.description
default:
switch o.doubleValue {
case 0.0/0.0: return "0.0/0.0" // NaN
case -1.0/0.0: return "-1.0/0.0" // -infinity
case +1.0/0.0: return "+1.0/0.0" // infinity
default:
return o.doubleValue.description
}
}
case let o as NSString:
return o.debugDescription
default:
let opts = pretty ? JSONSerialization.WritingOptions.prettyPrinted : JSONSerialization.WritingOptions()
if let data = (try? JSONSerialization.data(
withJSONObject: _value, options:opts)) as NSData? {
if let result = NSString(
data:data as Data, encoding:String.Encoding.utf8.rawValue
) as? String {
return result
}
}
return "YOU ARE NOT SUPPOSED TO SEE THIS!"
}
}
public var description:String { return toString() }
}
注意上述代码中的CString。什么是正确模拟Swift 2行为的正确方法?
是的,做了诡计,非常感谢! –
欢迎伴侣:) –