CODEWITHSUNDEEP
iphoneiosobjective-ccocoa-touchuiimageview
Niharika Mishra
Niharika Mishra

Reputation: 1

Adding click event to image

I am new in objective c.I have an image and i want to show some alert message when i click on it Added image like this-

AHolder = [[UIImageView alloc] initWithFrame:CGRectMake(5, 80, 40, 40)];
    UIImage *imageA = [UIImage imageNamed:@"A.png"];
    AHolder.image = imageA;
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(aPressed:) name:@"aPressed" object:nil];
    [view addSubview:AHolder]

And its event like this-

 -(IBAction)aPressed:(id)sender
{
    UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"hello" message:@"a pressed" delegate:self cancelButtonTitle:@"cancle" otherButtonTitles:@"ok",nil];
    [alert show];
    [alert release];
}

It doesn't give me any error but also when i click on the image nothing happens. Please suggest me any solution.

Upvotes: 0

Views: 979

Answers (5)

Vaibhav Saran
Vaibhav Saran

Reputation: 12908

Need not to put UIButton over your image. Just use UIButton rather than UIImageView. You can set UIButton backgroundimage or image property to the image you want.

Other than this you can use UITapGestureRecognizer like this:

Put this code to viewDidLoad

UITapGestureRecognizer *rec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRecognized:)];
[yourImage addGestureRecognizer:rec];
[yourImage setUserInteractionEnabled:YES]; //!! this is important

and implement this delegate method

#define unused_related_to_gesture
- (void)tapRecognized:(UITapGestureRecognizer *)recognizer
{
    if(recognizer.state == UIGestureRecognizerStateBegan)
    {
        NSLog(@"\nUIGestureRecognizerStateBegan\n");
    }
    if(recognizer.state == UIGestureRecognizerStateCancelled)
    {
        NSLog(@"\nUIGestureRecognizerStateCancelled\n");
    }
    if(recognizer.state == UIGestureRecognizerStateChanged)
    {
        NSLog(@"\nUIGestureRecognizerStateChanged\n");
    }
    if(recognizer.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"\nUIGestureRecognizerStateEnded\n");
    }
    if(recognizer.state == UIGestureRecognizerStateFailed)
    {
        NSLog(@"\nUIGestureRecognizerStateFailed\n");
    }
    if(recognizer.state == UIGestureRecognizerStatePossible)
    {
        NSLog(@"\nUIGestureRecognizerStatePossible\n");
    }
    if(recognizer.state == UIGestureRecognizerStateRecognized)
    {
        NSLog(@"\nUIGestureRecognizerStateRecognized\n");
        // this section will contain your code of clicking the image.
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"hello" message:@"a pressed" delegate:self cancelButtonTitle:@"cancle" otherButtonTitles:@"ok",nil];
        [alert show];
        [alert release];
    }
}

Upvotes: 0

onuryilmaz
onuryilmaz

Reputation: 398

Add "round rect button" object in the xib file. Set 'Type' attribute to 'custom', 'Background' attribute to 'nameofyourimage.extension'.

Connect aPressed: method to the touch up inside event of the round rect button.

Upvotes: 0

Balu
Balu

Reputation: 8460

Add tap gestures to the image view .

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture)];
tapGesture.numberOfTapsRequired=1;
[AHolder setUserInteractionEnabled:YES];
[AHolder addGestureRecognizer:tapGesture];
[tapGesture release];

-(void)handleTapGesture{
//do what ever you want here
}

Otherwise, simply use button with background image.

Upvotes: 2

Anil
Anil

Reputation: 1028

Very simple and most popular solution to your question would be to use a custom UIButton over your image. Then just set the selector as your method you want to call on click of button. Make sure that the frame of UIButton & UIImage is same.

Upvotes: 0

Burhanuddin Sunelwala
Burhanuddin Sunelwala

Reputation: 5343

Use tapGestureRecognizer. so whenever user taps the iamgeview, you can do what ever you want

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(aPressed)];
tapGesture.numberOfTapsRequired=1;
[aHolder setUserInteractionEnabled:YES];
[aHolder addGestureRecognizer:tapGesture];

-(void)aPressed{
//do what ever you want here
}

Upvotes: 0

Related Questions