Find First Responder by asking UIApplication

Find First Responder (fast)

// ************************************************************* //
// UIResponder+FirstResponder.h
// ************************************************************* //

@interface UIResponder (FirstResponder)

+ (UIResponder*)firstResponder;

@end

// ************************************************************* //
// UIResponder+FirstResponder.m
// ************************************************************* //

static __weak UIResponder *__currentFirstResponder = nil;

@implementation UIResponder (FirstResponder)

+ (UIResponder*)firstResponder
{
    __currentFirstResponder = nil;
    
    // Apple Documentation: "If target is nil, the app sends the message to the first responder"
    [[UIApplication sharedApplication] sendAction:@selector(mjz_findFirstResponder:) to:nil from:nil forEvent:nil];
    
    return __currentFirstResponder;
}

- (void)mjz_findFirstResponder:(id)sender
{
    __currentFirstResponder = self;
}

@end