小编xra*_*age的帖子

我正在使用swift构建一个RSS阅读器,需要实现pull to reload功能.

这是我试图这样做的方式.

class FirstViewController: UIViewController,
    UITableViewDelegate, UITableViewDataSource {

   @IBOutlet var refresh: UIScreenEdgePanGestureRecognizer
   @IBOutlet var newsCollect: UITableView

   var activityIndicator:UIActivityIndicatorView? = nil

   override func viewDidLoad() {
       super.viewDidLoad()
       self.newsCollect.scrollEnabled = true
      // Do any additional setup after loading the view, typically from a nib.

      if nCollect.news.count <= 2{
          self.collectNews()
       }
      else{
          self.removeActivityIndicator()
       }
      view.addGestureRecognizer(refresh)
   }



@IBAction func reload(sender: UIScreenEdgePanGestureRecognizer) {
    nCollect.news = News[]()
    return newsCollect.reloadData()
}

我正进入(状态 :

属性'self.refresh'未在super.init调用中初始化

请帮助我理解手势识别器的行为.一个工作示例代码将是一个很好的帮助.

谢谢.

我正在写一个库,所以不使用UIKit,即使在我的iOS应用程序中,相同的代码也可以工作,但是当我在命令行中执行时却没有.在PlayGround中也似乎有效.

由于某种原因,回调没有被触发,因此print语句没有执行.

internal class func post(request: URLRequest, responseCallback: @escaping (Bool, AnyObject?) -> ()) {
    execTask(request: request, taskCallback: { (status, resp)  -> Void in
            responseCallback(status, resp)
    })
}

internal class func clientURLRequest(url: URL, path: String, method: RequestMethod.RawValue,  params: Dictionary<String, Any>? = nil) -> URLRequest {
    var request = URLRequest(url: url)
    request.httpMethod = method
    do {
        let jsonData = try JSONSerialization.data(withJSONObject: (params! as [String : Any]), options: .prettyPrinted)

        request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
        request.httpBody = jsonData
    } catch let error as NSError { …

目前,在ES 5.6上,我们使用groovy内联脚本来获取给定文档中给定术语的tf,如 -

GET document/_search
{
  "size": 114,
  "query": {"terms": {
    "doc_id": [1840, 2160]
  }}, 
        "script_fields": {
          "tf": {
            "script": {
              "lang": "groovy",
              "inline": "_index['text'][term_value].tf()",
              "params": {
                "term_value": "hello"
              }
            }
          }
        }
      }

所以它回复我的回应 -

 "hits": {
    "total": 36,
    "max_score": 1,
    "hits": [
      {
        "_index": "document",
        "_type": "sample",
        "_id": "41707",
        "_score": 1,
        "fields": {
          "tf": [
            3
          ]
        }
      }]

但是在ES 6.0 groovy支持下降之后,似乎脚本引擎是唯一的解决方案,而且由于缺乏对Elasticsearch类和内部行为的正确理解,很难弄清楚实现.

基于Scripting Engine文档,我需要实现

private static class MyExpertScriptEngine implements ScriptEngine {
    @Override
    public String getType() {
        return …

我在stackoverflow上发现了很多关于这方面的问题,但没有解决我的问题.经过大量的谷歌搜索仍然我面临AccessDenied异常:

<Error>
<Code>AccessDenied</Code>
</Message><RequestId>ADF9C0DE6C86DF4F</RequestId>
<HostId>JwQLkNB0LuJvh0jwrsJe9wazxLsd+hrZ2qwvjCvmXYd2A/ckCrsotRMHm</HostId>
</Error>

以下是我的用户和组策略文档:

用户政策:

{
"Statement":[
  {
     "Sid":"AllowListBucketIfSpecificPrefixIsIncludedInRequest",
     "Action":"s3:*",
     "Effect":"Allow",
     "Resource":["arn:aws:s3::: mybucket", "arn:aws:s3:::mybucket/*"],
     "Condition":{
        "StringLike":{"s3:prefix":["Development/*"]
        }
     }
  },
  {
    "Sid":"AllowUserToReadWriteObjectDataInDevelopmentFolder", 
    "Action":"s3:*",
    "Effect":"Allow",
    "Resource":["arn:aws:s3::: mybucket/Development/*"]
  },
  {
     "Sid": "ExplicitlyDenyAnyRequestsForAllOtherFoldersExceptDevelopment",
     "Action": ["s3:ListBucket"],
     "Effect": "Deny",
     "Resource": ["arn:aws:s3::: mybucket", "arn:aws:s3::: mybucket/*"],
     "Condition":{  "StringNotLike": {"s3:prefix":["Development/*"] },
                    "Null"         : {"s3:prefix":false }
      }
  }
]
}

组策略:

{
"Statement": [
{
  "Sid": "AllowGroupToSeeBucketListAndAlsoAllowGetBucketLocationRequiredForListBucket",
  "Action": ["s3:ListAllMyBuckets", "s3:GetBucketLocation"],
  "Effect": "Allow",
  "Resource": ["arn:aws:s3:::*"]
},
{
  "Sid": "AllowRootLevelListingOfCompanyBucket",
  "Action": ["s3:ListBucket"],
  "Effect": "Allow",
  "Resource": ["arn:aws:s3::: mybucket", "arn:aws:s3::: mybucket/*"], …