#import "ViewController.h"

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UIImageView *imageViewFirst;

@property (strong, nonatomic) IBOutlet UIImageView *imageViewSecond;

@property(nonatomic,assign)__block BOOL rectToVisible;

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    _rectToVisible=YES;

    [self.view addSubview:_imageViewFirst];

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    if (_rectToVisible) {

        [UIView transitionFromView:self.imageViewFirst toView:self.imageViewSecond duration: options:UIViewAnimationOptionTransitionFlipFromLeft completion:^(BOOL finished) {

            NSLog(@"animatioin complete");

            _rectToVisible=!_rectToVisible;

        }];

    }

    else

    {

        [UIView transitionFromView:self.imageViewSecond toView:self.imageViewFirst duration: options:UIViewAnimationOptionTransitionFlipFromRight completion:^(BOOL finished) {

            NSLog(@"animatioin complete");

            _rectToVisible=!_rectToVisible;

        }];

    }

}

@end