Slow animations in the iOS Simulator, also for CAAnimations

CALayer+SlowAnimations.m

// Slow animations in the iOS Simulator, also for CAAnimations

#if TARGET_IPHONE_SIMULATOR

#import <QuartzCore/QuartzCore.h>
#import <dlfcn.h>
#import <mach-o/dyld.h>
#import <objc/runtime.h>

static CGFloat (*UIAnimationDragCoefficient)(void) = NULL;

@interface CALayer (SlowAnimations)

- (void) slow_addAnimation:(CAAnimation *)animation forKey:(NSString *)key;

@end

@implementation CALayer (SlowAnimations)

+ (void) load
{
	@autoreleasepool
	{
		void *UIKit = dlopen([[[NSBundle bundleForClass:[UIApplication class]] executablePath] fileSystemRepresentation], RTLD_LAZY);
		UIAnimationDragCoefficient = (CGFloat (*)(void))dlsym(UIKit, "UIAnimationDragCoefficient");
		
		if (UIAnimationDragCoefficient)
		{
			Method addAnimationForKey = class_getInstanceMethod(self, @selector(addAnimation:forKey:));
			Method slowAddAnimationForKey = class_getInstanceMethod(self, @selector(slow_addAnimation:forKey:));
			method_exchangeImplementations(addAnimationForKey, slowAddAnimationForKey);
		}
	}
}

- (void) slow_addAnimation:(CAAnimation *)animation forKey:(NSString *)key
{
	BOOL callerIsApplication = NO;
	for (uint32_t i = 0; i < _dyld_image_count(); i++)
	{
		const struct mach_header *header = _dyld_get_image_header(i);
		if (header->filetype == MH_EXECUTE)
		{
			Dl_info info;
			if (dladdr(__builtin_return_address(0), &info) != 0)
			{
				callerIsApplication = (info.dli_fbase == header);
				break;
			}
		}
	}
	if (callerIsApplication)
		animation.duration *= UIAnimationDragCoefficient();
	
	[self slow_addAnimation:animation forKey:key];
}

@end

#endif

The return type of UIAnimationDragCoefficient() needs to be float instead of CGFloat for it to work in the 64 bit iPhone Simulator.