c# - How to check if a certain method/class/API exists in Xamarin iOS? -

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After the

it is recommended to check for a specific API like this 

  IsiOS7 bool public stable {Returns UIDevice.CurrentDevice.CheckSystemVersion (7, 0); }} If (Util.IsiOS7) {// call iOS 7 API} and {// iOS 6.1 or earlier API call}   
 The same should go for iOS 8. Now I have read that you should check whether there is a certain method or class exists rather than checking the version. Here comes the  RespondsToSelector  that should be something like this  
  if (RespondsToSelector (new selector ("edgesForExtendedLayout"))) EdgesForExtendedLayout = UIRectEdge.None.   
 But how will one examine if a whole class exists like  UIAlertController ? In Objective-C, there is no  NSClassFromString  I have seen in some such purpose -  
  if ([UIAlertController class]) {// ...} < / Code>  
 Will such a move happen?  
  type type = type Gettype ("UIAlertController"); If (type! = Null) {// iOS 8 API} other {// iOS 7 or lower}   
 How will this happen in C #? Or to check for  UIAlertController  for other methods,  UISearchController , ... and so on.   
 
 
 do this:   < Using code> MonoTouch.ObjCRuntime; Bool hasUIAlertController = Class.GetHandle ("UIAlertController")! = IntPtr.Zero; If (HuiLeart Controller) {// iOS 8} and {// iOS 7 or lower}

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