Checking if UIGraphicsBeginImageContextWithOptions is supported

Question

I\'m working on an iOS app. It currently only works on iOS 4 since I use the following method on several occasions: \"UIGraphicsBeginImageContextWithOptions\". This method i

Answer 1

UIGraphicsBeginImageContextWithOptions is a C function, so you can't use Objective-C methods like -respondsToSelector: to test its existence.

You could, however, weak link the UIKit framework, and then check if UIGraphicsBeginImageContextWithOptions is NULL:

if (UIGraphicsBeginImageContextWithOptions != NULL) {
   UIGraphicsBeginImageContextWithOptions(...);
} else {
   UIGraphicsBeginImageContext(...);
}