所以我在解析服务器中有一个名为“classes”的类,我试图在我的程序中实现一个错误检查查询。 Xcode 项目构建正确,但是,当我尝试错误检查我的查询以搜索类时,程序总是说搜索成功,即使该类类型的对象不在查询中。这是代码:
@IBAction func searchClass(_ sender: Any) {
let query = PFQuery(className: "Classes")
query.findObjectsInBackground { (success, error) in
if error != nil{
self.createAlert(title: "Error", message: "Cannot find class")
} else {
self.createAlert(
title: "Success", message: "Found the query")
self.classSuccess = true
self.flipCardButton.alpha = 0
UIView.transition(from: self.classQuery, to: self.classRate, duration: 0.5, options: .transitionFlipFromRight)
self.goBackButton.alpha = 1
}
}
这是我应用程序中的搜索按钮:
使解析查询检查始终打印成功可能会出现什么问题?
最佳答案
我认为您在查询中遗漏了成功语句。
let query = PFQuery(className: "Classes")
query.findObjectsInBackground { (success, error) in
if error != nil{
print(error ?? "")
self.createAlert(title: "Error", message: "Cannot find class")
}
if success {
self.createAlert(
title: "Success", message: "Found the query")
self.classSuccess = true
self.flipCardButton.alpha = 0
UIView.transition(from: self.classQuery, to: self.classRate, duration: 0.5, options: .transitionFlipFromRight)
self.goBackButton.alpha = 1
} else {
self.createAlert(title: "Error", message: "Cannot find class")
}
}
关于ios - 错误检查无法正常用于解析查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45121228/