Add sentinel to disable UICollectionView forwarding if class exists

PSTCollectionView/PSTCollectionView.h

@@ -34,11 +34,11 @@ typedef NS_ENUM(NSUInteger, PSTCollectionElementCategory) {
     PSTCollectionElementCategoryDecorationView
 };
 
-/**
- Replacement for UICollectionView for iOS4/5.
- Only supports a subset of the features of UICollectionView.
- e.g. animations won't be handled.
- */
+/// Define the `PSTCollectionViewDisableForwardToUICollectionViewSentinel` to disable the automatic forwarding to UICollectionView on iOS 6+. (Copy below line into your AppDelegate.m)
+//@interface PSTCollectionViewDisableForwardToUICollectionViewSentinel : NSObject @end @implementation PSTCollectionViewDisableForwardToUICollectionViewSentinel @end
+
+/// API-compatible replacement for UICollectionView.
+/// Works on iOS 4.3 upwards (including iOS 6).
 @interface PSTCollectionView : UIScrollView
 
 - (id)initWithFrame:(CGRect)frame collectionViewLayout:(PSTCollectionViewLayout *)layout; // the designated initializer

PSTCollectionView/PSTCollectionView.m

@@ -2255,6 +2255,8 @@ static BOOL PSTRegisterClass(NSString *UIClassName, Class PSTClass) {
 
 // Create subclasses that pose as UICollectionView et al, if not available at runtime.
 __attribute__((constructor)) static void PSTCreateUICollectionViewClasses(void) {
+    if (objc_getClass("PSTCollectionViewDisableForwardToUICollectionViewSentinel")) return;
+
     @autoreleasepool {
         // Change superclass at runtime. This allows seamless switching from PST* to UI* at runtime.
         PSTRegisterClass(@"UICollectionView", PSUICollectionView_.class);