How to handle event of code-created UIView - ios

Question

I have unknown amount of UIImageViews which are created in the code, not in the xib file and i need to handle the taps on those images. The handling of each of this image view is going to be the same. How do i do this?

Answer 1

Demo code for your implemantation
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIImageView *imgView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected:)];
singleTap.numberOfTapsRequired = 1;
[imgView1 setUserInteractionEnabled:YES];
[imgView1 addGestureRecognizer:singleTap];
imgView1.tag = 1;
imgView1.backgroundColor = [UIColor redColor];
[self.view addSubview:imgView1];
UIImageView *imgView2 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 200, 100, 100)];
UITapGestureRecognizer *singleTap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected:)];
singleTap.numberOfTapsRequired = 1;
[imgView2 setUserInteractionEnabled:YES];
[imgView2 addGestureRecognizer:singleTap2];
imgView2.tag = 2;
imgView2.backgroundColor = [UIColor blueColor];
[self.view addSubview:imgView2];
}
-(void)tapDetected:(UITapGestureRecognizer *)gestureRecognizer{
UIImageView *myImg = (UIImageView*)gestureRecognizer.view;
NSLog(#"tag : %ld",(long)myImg.tag);
}

Answer 2

Try this code to add a gesture recogniser
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(action:)];
[_imgview addGestureRecognizer:tap];
_imgview.userInteractionEnabled = YES;

Answer 3

You can add UITapGestureRecognizer to detect touch on UIImageView.
Just use below method with argument, your image view and a unique tag, and you're done !
- (void) setTapGestureOnImageView:(UIImageView *)imageView withTag:(NSInteger)tag {
//this is important, by default user interaction isn't enabled, we have to enable it.
imageView.userInteractionEnabled = YES;
//create a tap gesture (in example this is sinlge tap) with target and action to call when user tap
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(detectTap:)];
//you can customize taps too
//tap.numberOfTapsRequired = 2;
//tap.numberOfTouchesRequired = 2;
//add gesture on image view
[imageView addGestureRecognizer:tap];
}
- (void)detectTap:(UIGestureRecognizer *)recognizer {
//Get the tapped image view from recognizer
UIImageView *imageView = (UIImageView *)recognizer.view;
//Check for condition, which image view tapped
if(imageView.tag == 1) {
//do something 1st imageview
}
else if(imageView.tag == 2) {
//do something for 2nd imageview
}
else {
//do something else
}
}

Answer 4

May be this will be useful to you
- (void)viewDidLoad
{
NSArray *imagesArray = [NSArray arrayWithObjects:#"statement_card_1.png", #"statement_card_2.png", #"statement_card_3.png", #"statement_card_4.png", #"statement_card_5.png", nil];
short xPadding = 10;
for (int i = 0; i< imagesArray.count; i++)
{
UIImage *imageRecipe =[UIImage imageNamed:[imagesArray objectAtIndex:i]];
UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(xPadding, xPadding+(i*60),imageRecipe.size.width, imageRecipe.size.height)];
imgView.tag =IMAGETAG + i;
[imgView setImage:imageRecipe];
imgView.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected:)];
[imgView addGestureRecognizer:singleTap];
[self.view addSubview:imgView];
}
}
-(void)tapDetected:(UITapGestureRecognizer *)recognizer
{
UIImageView *TempImg = (UIImageView *)recognizer.view;
NSLog(#"tag : %ld",(long)TempImg.tag);
}