Automatic event-tracking for iOS analytics.

event_automator.m

#import "UIApplication+EventAutomator.h"
#import <objc/runtime.h>

@implementation UIApplication (EventAutomator)

+ (void)load {
    Class class = [self class];
    SEL originalSelector = @selector(sendAction:to:from:forEvent:);
    SEL replacementSelector = @selector(heap_sendAction:to:from:forEvent:);

    Method originalMethod = class_getInstanceMethod(class, originalSelector);
    Method replacementMethod = class_getInstanceMethod(class, replacementSelector);
    method_exchangeImplementations(originalMethod, replacementMethod);
}

- (BOOL)heap_sendAction:(SEL)action to:(id)target from:(id)sender forEvent:(UIEvent *)event {
    NSString *selectorName = NSStringFromSelector(action);
    printf("Selector %s occurred.\n", [selectorName UTF8String]);
    return [self heap_sendAction:action to:target from:sender forEvent:event];
}

@end