我想传递一个nil值,即可选参数值之一.并且它必须在Alamofire Post请求中继续使用nil值.如果你告诉我下一步该如何进行会有所帮助吗？
let image: UIImage = UIImage()
let imageData = UIImagePNGRepresentation(image)
let base64String = imageData?.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
let parameters = [
"first_name": "XXXXX","email" : "1234@gmail.com","password" : "password","profile_picture" : base64String]
Alamofire.request(.POST,"http://abc/public/user/register",parameters: parameters,encoding: .JSON,headers: nil)
.progress { bytesWritten,totalBytesWritten,totalBytesExpectedToWrite in
print(totalBytesWritten)
// This closure is NOT called on the main queue for performance
// reasons. To update your ui,dispatch to the main queue.
dispatch_async(dispatch_get_main_queue()) {
print("Total bytes written on main queue: \(totalBytesWritten)")
}
}
.responseJSON { response in
debugPrint(response)
}
即使profile_pictures为空,响应也应该成功.我知道可以通过可选链接完成,但不知道如何继续！
通过传递nil或未初始化的可选参数Server将获得Optional
您可以将NSNull()传递给字典
试试这个,就像
var params = ["paramA","valueA"] if imageBase64 == nil { parms["image"] = NSNull()} else { params["image"] = imageBase64 }
swiftyjson也将null作为NSNull处理
这里也有很好的参考
null / nil in swift language
