无法检查JSON响应条件以在swift中的表视图单元格中显示数据

Question

这是poster:中的json响应

{
"result": {

"categories": [
{
"title": "ADMINISTRATION & SECRETARIAL",
"children": [
{
"id": 266,
"certificate_required": "Y",
"get_service": null
}
]
},
{
"title": "BUILDING",
"children": [
{
"id": 299,
"certificate_required": "Y",
"get_service": {
"id": 778,
"get_certificate": {

"certificate_file": "62e3a911d0233.jpg",

}
}
}
]
},
{
"id": 148,
"title": "DIGITAL DEVELOPMENT ",
"children": [
{
"id": 152,
"title": "WEB DESIGN",
"certificate_required": "N",
"get_service": null
}
]
}
]
}
}

这里我需要检查get_certificate是否存在

所以我写了如下代码：

如果

get_certificate != nil 

然后我需要出示

cell.subCatLbl.text = "(indexData?.title ?? "") (Uploaded)

但仍显示

cell.subCatLbl.text = "(indexData?.title ?? "") (Certificate). 

为什么？

我哪里错了。请引导我

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return categoryData[section].children?.count ?? 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "AddserviceCell", for: indexPath) as! AddserviceCell
cell.selectionStyle = .none
let indexData = categoryData[indexPath.section].children?[indexPath.row]
switch indexData {
case _ where indexData?.certificate_required == "Y":
cell.subCatLbl.text = "(indexData?.title ?? "") (Certificate)"
case _ where ((indexData?.get_service?.get_certificate) != nil):
cell.subCatLbl.text = "(indexData?.title ?? "") (Uploaded)"
default:
cell.subCatLbl.text = indexData?.title
break
}
return cell
}

Answer 1

由于您的switch语句，您没有达到预期的结果。

switch语句只执行它的一个路径，确切地说是第一个匹配条件。所以每次

indexData?.certificate_required == "Y"

是真正的

cell.subCatLbl.text = "(indexData?.title ?? "") (Certificate)"

将执行，而不管接下来会发生什么。

解决方案：

要么采用切换条件，使优先级最高的条件优先出现：

case _ where ((indexData?.get_service?.get_certificate) != nil):
cell.subCatLbl.text = "(indexData?.title ?? "") (Uploaded)"
case _ where indexData?.certificate_required == "Y":
cell.subCatLbl.text = "(indexData?.title ?? "") (Certificate)"
default:
cell.subCatLbl.text = indexData?.title
break

或者在这里使用if/else方法：

if indexData?.get_service?.get_certificate != nil && indexData?.certificate_required == "Y"{
cell.subCatLbl.text = "(indexData?.title ?? "") (Uploaded)"
} else if indexData?.certificate_required == "Y"{
cell.subCatLbl.text = "(indexData?.title ?? "") (Certificate)"
} else {
cell.subCatLbl.text = indexData?.title
}