Customize FilePicker private Controller by rerouting

CustomFilePicker.m

#import <objc/message.h>

IMP tableView_cellForRowAtIndexPath = nil;
IMP viewDidAppear = nil;

CGFloat myMethodIMP(id self, SEL _cmd, UITableView *tableView, int section) {
	// implementation ....
	NSLog(@"%@", tableView);
	NSLog(@"%d", section);
	
	if (section) return 70;
	return 0;
}

UITableViewCell *myMethodIMP2(id self, SEL _cmd, UITableView *tableView, NSIndexPath *indexPath) {
	// implementation ....
	UITableViewCell *cell = tableView_cellForRowAtIndexPath(self, _cmd, tableView, indexPath);
	UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
	v.backgroundColor = [UIColor redColor];
	cell.backgroundView = v;
	return cell;
}

void myMethodIMP3(id self, SEL _cmd, BOOL animated) {
	// implementation ....
	NSLog(@"%@", ((UIViewController*)self).navigationController.viewControllers);
	
}

Class cls = NSClassFromString(@"FPSourceListController");

tableView_cellForRowAtIndexPath = class_getMethodImplementation(cls, @selector(tableView:cellForRowAtIndexPath:));
viewDidAppear = class_getMethodImplementation(cls, @selector(viewDidAppear:));

class_replaceMethod(cls, @selector(tableView:heightForHeaderInSection:), (IMP) myMethodIMP, "f@:@i");
class_replaceMethod(cls, @selector(tableView:cellForRowAtIndexPath:), (IMP) myMethodIMP2, "f@:@i");
class_replaceMethod(cls, @selector(viewDidDisappear:), (IMP) myMethodIMP3, "v@:");