小编Jum*_*dad的帖子

我正在使用Xcode 9.2和Swift 4.如何检查返回的json数据是否为空？现在,它给了我错误Type 'Any' has no subscript members的行if json[0]["data"]

var json: NSMutableArray = []
var newsArray: NSMutableArray = []

let url = URLFactory()
var data = try! NSData(contentsOf: url.getURL()) as Data
do {
    json = try JSONSerialization.jsonObject(with: data, options: []) as! NSMutableArray
    if json[0]["data"] {
        // data is not null
    }
} catch let error as NSError {
    // handle error
}

我的JSON返回如下内容:

{
   "data":
   [
      {
         "news_id":123,
         "title":"title",
         "news_date":"2017-02-08 21:46:06",
         "news_url":"url",
         "short_description":"description",
         "category_id":4,
         "category_name":"Health",
         "latlng":
         [ …

我正在尝试检查数组是否categories包含数字1 ，例如Int因为categories = [Int]()categories = {1, 2, 3, 4, 5}

我尝试了以下代码，这给了我错误 Binary operator '==' cannot be applied to operands of type 'Any' and 'Int'

if categories.contains (where: {$0 == 1}) {
    // 1 is found
}

也尝试了没有下面的哪里和方括号的尝试，这给了我同样的错误

if categories.contains { $0 == 1 } {
    // 1 is found
}

我尝试只使用以下元素，这给了我错误 Missing argument label 'where:' in call

if categories.contains(1) {
    // 1 is found
}

我怎样才能做到这一点？