Swipe Gesture Not Working

Question

i wanted to swipe my image view but not swapped to left side. i get image from frontcard array. and i wanted to display in imageview and swipe verticlally.

I tried this one

FrontsCards =[[NSMutableArray alloc]initWithCapacity:9];
[FrontsCards insertObject:@"cloub1.png" atIndex:0];
[FrontsCards insertObject:@"cloub2.png" atIndex:1];
[FrontsCards insertObject:@"cloub3.png" atIndex:2];
[FrontsCards insertObject:@"cloub4.png" atIndex:3];
[FrontsCards insertObject:@"cloub5.png" atIndex:4];
[FrontsCards insertObject:@"cloub6.png" atIndex:5];
[FrontsCards insertObject:@"cloub7.png" atIndex:6];
[FrontsCards insertObject:@"cloub8.png" atIndex:7];
[FrontsCards insertObject:@"cloub9.png" atIndex:8];

- (void)viewDidLoad {
    [super viewDidLoad];

    UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(leftSwipeHandle:)];
    leftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
    [leftRecognizer setNumberOfTouchesRequired:1];
    [ImgView addGestureRecognizer:leftRecognizer];
}

- (void)leftSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer 
    int m = 0;
    NSLog(@"Left Swipe");

    AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
    NSLog(@"%d",m);

    for(m=0; m<[delegate.FrontsCards count];m++) {
        int randIdx=arc4random()%[delegate.FrontsCards count];   // Randomly     shufffled
        ImgView.userInteractionEnabled=YES;
        ImgView.image=[UIImage imageNamed:[delegate.FrontsCards objectAtIndex:randIdx]];

        NSLog(@"%d",m);
    }
}

images not swapped to imageview. how to solve my problem help me out this. thanks in advance.

Answer 1

Try to use this one. Because by default image's user interaction is NO. So you need to set user interaction YES.

FrontsCards =[[NSMutableArray alloc]initWithCapacity:9];
[FrontsCards insertObject:@"cloub1.png" atIndex:0];
[FrontsCards insertObject:@"cloub2.png" atIndex:1];
[FrontsCards insertObject:@"cloub3.png" atIndex:2];
[FrontsCards insertObject:@"cloub4.png" atIndex:3];
[FrontsCards insertObject:@"cloub5.png" atIndex:4];
[FrontsCards insertObject:@"cloub6.png" atIndex:5];
[FrontsCards insertObject:@"cloub7.png" atIndex:6];
[FrontsCards insertObject:@"cloub8.png" atIndex:7];
[FrontsCards insertObject:@"cloub9.png" atIndex:8];

- (void)viewDidLoad {
    [super viewDidLoad];

    UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(leftSwipeHandle:)];
    leftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
    [leftRecognizer setNumberOfTouchesRequired:1];
    [ImgView addGestureRecognizer:leftRecognizer];

    // --------------- Add this line here ------------
    ImgView.userInteractionEnabled = YES;
}

- (void)leftSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer {
    int m = 0;
    NSLog(@"Left Swipe");

    AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
    NSLog(@"%d",m);

    for(m=0; m<[delegate.FrontsCards count];m++) {
        int randIdx=arc4random()%[delegate.FrontsCards count];   // Randomly     shufffled
        ImgView.image=[UIImage imageNamed:[delegate.FrontsCards objectAtIndex:randIdx]];
        NSLog(@"%d",m);
    }
}

Answer 2

in .h file

int imgCount;

in .m file

- (void)viewDidLoad  {
    [super viewDidLoad];

    ImgView.userInteractionEnabled=YES;
    UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(leftSwipeHandle:)];
    leftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
    [leftRecognizer setNumberOfTouchesRequired:1];
    [ImgView addGestureRecognizer:leftRecognizer];

    imgCount = 0;
}

- (void)leftSwipeHandle:(UISwipeGestureRecognizer*)gestureRecognizer {
    AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
    ImgView.image=[UIImage imageNamed:[delegate.FrontsCards objectAtIndex:imgCount]];
    imgCount++;
    if (imgCount >= 9) {
       imgCount = 0;
    }
}

Answer 3

Try this

[ImgView addGestureRecognizer:leftRecognizer];
//Add this
ImgView.userInteractionEnabled = YES;

Answer 4

You need to set imageview.userInteractionEnabled = YES; on UIImageView.

Answer 5

Try this.

UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(leftSwipeHandle:)];
leftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[leftRecognizer setNumberOfTouchesRequired:1];
[ImgView addGestureRecognizer:leftRecognizer];
ImgView.userInteractionEnabled = YES;

UIImageView is disabled by default. You need to make it enabled.