Question

I’ve a UIScrollView with a subview UIView, here UIView also has subview of type UIImageView.

The hierarchy something like ViewController -> UIScrollView -> UIView -> UIImageView.

All, UIScrollView, UIView, UIImageView added dynamically, all enabled userInteractionEnabled=YES, at once SIX views visible on UIScrollView as user scrolls the next SIX UIViews will be visible.

I am implementing UITouch events to detect any touch on my UIImageView

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //I want to detect particular UIImageView
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    //Here, user can move any UIImageView
}

But, I can’t detect touch on it. I try for some other ways said here. Also tried some of my mind suggested me, but I found & realize that any subviews under UIScrollView couldn’t detect any object.

I also tried for one more thing that, I added a UIView as subview in self.view, any its interesting to know that, its detects touch!!

Is anyone with this kind of issue, having any solution? Any help would be appreciated.

Answer 1

U can do one things,

Same Problem I have already face,So
In UIscrollview Add Caustom UIButton and set image and define tag all the button into the UIButton.
this way work very smoothly.

UIScrollView* scrForSubItem = [[UIScrollView alloc] initWithFrame:CGRectMake(10,2,1024,580)]; 
[scrForSubItem setAlwaysBounceVertical:YES];
scrForSubItem.minimumZoomScale = 1;
scrForSubItem.maximumZoomScale = 3;
scrForSubItem.scrollEnabled = YES;
scrForSubItem.pagingEnabled = NO;
scrForSubItem.directionalLockEnabled = YES;
scrForSubItem.showsVerticalScrollIndicator = YES;
scrForSubItem.backgroundColor = [UIColor clearColor];
scrForSubItem.delegate = self;

int xOffset = 0;
int yOffset = 0;
for (int i = 0; i < [currnetitem count]; i++) {


UIImageView* imgViewBtn=[[[UIImageView alloc]initWithFrame:CGRectMake(xOffset,yOffset,            246,170)] autorelease];

    [imgViewBtn setUserInteractionEnabled:YES];
    [imgViewBtn setContentMode:UIViewContentModeScaleAspectFit];
    imgViewBtn.image=btnImg;

    UIButton *btnSelectTile = [UIButton buttonWithType:UIButtonTypeCustom];
    [btnSelectTile setFrame:CGRectMake(0,0,246,170)];
    [btnSelectTile setTag:i];
    [btnSelectTile setBackgroundColor:[UIColor clearColor]];
    [btnSelectTile addTarget:self action:@selector(scrImagePressed:) forControlEvents:UIControlEventTouchUpInside];
    [imgViewBtn addSubview:btnSelectTile];

    [self.scrForSubItem addSubview:imgViewBtn];
   xOffset += btnSelectTile.frame.size.width+10;

    if(xOffset>scrollWidth)
    {
        xOffset=0;
        yOffset += btnSelectTile.frame.size.height+10;
        [scrForSubItem setContentSize:CGSizeMake(xOffset,yOffset)];
    }
    else{

        [scrForSubItem setContentSize:CGSizeMake(xOffset,170)];

    }

    [self.viewa ddSubview:scrForSubItem]; 

}