在queryForTable（）中使用UISwitch更改parse.com类(change parse.com class with UISwitch in queryForTable())

在queryForTable（）中使用UISwitch更改parse.com类(change parse.com class with UISwitch in queryForTable())

我试图使用UISwitch在解析类之间切换。 我在解析时有两个类mainClass和recentClass，我试图通过使用语法在它们之间切换。

我已经在这个类的顶部声明了查询。

@IBOutlet weak var barSwitch: UISwitch! var query = PFQuery(className: "mainClass") func switchChanged(barSwitch:UISwitch){ if (barSwitch.on == true) { dispatch_async(dispatch_get_main_queue(),{ () -> Void in self.query = PFQuery(className: "recentClass") self.tableView.reloadData() } ) } else { dispatch_async(dispatch_get_main_queue(),{ () -> Void in self.query = PFQuery(className: "mainClass") self.tableView.reloadData() print("button was pressed") } ) } }

我不知道如何在queryForTable（）中使用该开关

override func queryForTable() -> PFQuery { if (objects?.count == 0) { query.cachePolicy = PFCachePolicy.CacheThenNetwork } query.orderByAscending("SNo") return query }

根据@Tim我已编辑但仍然无法正常工作。

I have trying to switch between the parse class using a UISwitch . I have two classes mainClass and recentClass in parse , I'm trying to switch between them by using the syntax .

I have already declared the query on the top of the class like this.

@IBOutlet weak var barSwitch: UISwitch! var query = PFQuery(className: "mainClass") func switchChanged(barSwitch:UISwitch){ if (barSwitch.on == true) { dispatch_async(dispatch_get_main_queue(),{ () -> Void in self.query = PFQuery(className: "recentClass") self.tableView.reloadData() } ) } else { dispatch_async(dispatch_get_main_queue(),{ () -> Void in self.query = PFQuery(className: "mainClass") self.tableView.reloadData() print("button was pressed") } ) } }

I have no idea how I can use that switch in my queryForTable()

override func queryForTable() -> PFQuery { if (objects?.count == 0) { query.cachePolicy = PFCachePolicy.CacheThenNetwork } query.orderByAscending("SNo") return query }

As per @Tim I have edited but still it's not working.

最满意答案

你在switch函数中重新声明了query ，所以它不会改变你的类变量。 在func中取出query前面的let和var 。

此外，在dispatch内部，您可能需要放置self.query 。

要在switchChanged中调用switchChanged func：

override func queryForTable() -> PFQuery { switchChanged(barSwitch) if (objects?.count == 0) { query.cachePolicy = PFCachePolicy.CacheThenNetwork } query.orderByAscending("SNo") return query }

You're re-declaring query inside the switch function, so it's not changing your class variable. Take out let and var in front of query in the func.

Also, inside a dispatch, you probably need to put self.query.

To call the switchChanged func in queryForTable:

override func queryForTable() -> PFQuery { switchChanged(barSwitch) if (objects?.count == 0) { query.cachePolicy = PFCachePolicy.CacheThenNetwork } query.orderByAscending("SNo") return query }