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://*.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(_:)))
- elf.tabBarController?.navigationItem.rightBarButtonItem = b