I have created one array like below

```
var childControllers = NSArray()
childControllers = NSArray(objects: OBDPage1, OBDPage2, OBDPage3, OBDPage4)
self.loadScrollView(page: 0)// calling method

```

now I want to use array object like below 

```
func loadScrollView(page: Int){ // method
    if page >= childControllers.count {
        return
    }
    // replace the placeholder if necessary
    let controller: OBDPage1ViewController? = childControllers[page]
}

```

but I am getting below error 

> 
> Swift-CarAssist/Swift-CarAssist/OBDCarMonitorDeatilViewController.swift:90:67: Cannot convert value of type 'Any' to specified type 'OBDPage1ViewController?'
> 
> 
> 

can any one tell me where I am going wrong as I am new to swift.

Thanks in advance.
Priyanka