iOS Swift开发的一些坑

      0、人难招,特别是对于没钱的小团队,大多数的ios开发者没有swift经验,有经验的也并不是很深入

      0.1、语言unwrap坑,虽然有自动修正提示,但感觉代码过程不流畅。 

      1、Realm的缺憾: 最近filter用得多,发现realm的一个真正的毛病,其查询语法关键字和结构和常规标准SQL完全不一致,这真是shit,必须认真看filter部分的文档并多次尝试才能找到真正正确的查询语句结构

     2、UIButton的远程图像获取的坑,尝试了很多种方法,最后发现得给他预设一个图像,远程图像加载才能成功,真是一个好坑啊,Android里面好像也见过类似问题。

     3、Alamosfire的文件上传,参考:https://stackoverflow.com/questions/26121827/uploading-file-with-parameters-using-alamofire

// import Alamofire
func uploadWithAlamofire() {
  let image = UIImage(named: "bodrum")!

  // define parameters
  let parameters = [
    "hometown": "yalikavak",
    "living": "istanbul"
  ]

  Alamofire.upload(multipartFormData: { multipartFormData in
    if let imageData = UIImageJPEGRepresentation(image, 1) {
      multipartFormData.append(imageData, withName: "file", fileName: "file.png", mimeType: "image/png")
    }

    for (key, value) in parameters {
      multipartFormData.append((value?.data(using: .utf8))!, withName: key)
    }}, to: "upload_url", method: .post, headers: ["Authorization": "auth_token"],
        encodingCompletion: { encodingResult in
          switch encodingResult {
          case .success(let upload, _, _):
            upload.response { [weak self] response in
              guard let strongSelf = self else {
                return
              }
              debugPrint(response)
            }
          case .failure(let encodingError):
            print("error:\(encodingError)")
          }
  })
}

    4、NavigationViewController的TabBarViewController的内嵌ViewController设置其NavigationButtionItem,请注意,这种情况是因为TabBarVC是NavigationVC的栈顶VC,所以操作它的NavagationItem

     let b = UIBarButtonItem( image:#imageLiteral(resourceName: "post_message"), style:.plain, target:self, action:#selector(CommunityViewController.postClick(_:)))
        

    self.tabBarController?.navigationItem.rightBarButtonItem = b



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