evgenmikhaylov

#import <UIKit/UIKit.h>

@interface AppLaunchCounter : NSObject

+ (BOOL)isFirstLaunch;
+ (NSUInteger)numberOfLaunches;

@end

evgenmikhaylov

import UIKit

extension UIApplication {
    
    private struct AssociatedObjectsKeys {
        static var visibleViewControllersPointers = "UIApplication_visibleViewControllersPointers"
    }

    fileprivate var visibleViewControllersPointers: NSPointerArray {
        var pointers = objc_getAssociatedObject(self, &AssociatedObjectsKeys.visibleViewControllersPointers) as! NSPointerArray?

evgenmikhaylov

#import <UIKit/UIKit.h>

@interface UIApplication (VisibleViewControllers)

@property (nonatomic, readonly) NSArray<__kindof UIViewController *> *visibleViewControllers;

@end