Question

In my view i have one UIimageview and 4 UIButton , I show the images from NSMutableArray. How can i show the UIButton title as imageview images name without .png?I tried with following coding

imageary=[[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:@"dear.jpg"],[UIImage imageNamed:@"donkey.jpg"],[UIImage imageNamed:@"elephant.jpg"],[UIImage imageNamed:@"fox.jpg"],[UIImage imageNamed:@"giraffe.jpg"],[UIImage imageNamed:@"goat.jpg"],[UIImage imageNamed:@"buffallo.jpg"],[UIImage imageNamed:@"bull.jpg"],[UIImage imageNamed:@"cow.jpg"],[UIImage imageNamed:@"crocodile.jpg"], nil];


 - (NSString *) convertToDisplayName:(NSString *)actual
{
return [actual stringByReplacingOccurrencesOfString:@".png" withString:@" "];

}

While trying to retrive name using the above method

int i=0;
for(UIView *view in self.view.subviews)
{
    if([view isKindOfClass:[UIButton class]])
    {
       mybutton = (UIButton *)view;
        if(mybutton.tag == 1||mybutton.tag == 2||mybutton.tag == 3||mybutton.tag == 4)
        {

             animage.image=[imageary objectAtIndex:i];
            name=[self convertToDisplayName:[imageary objectAtIndex:i]];
            [mybutton setTitle:name forState:UIControlStateNormal];
            NSLog(@"current image name :%@",name);
            i++;

        }
    }
   }

it showing error

 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImage stringByReplacingOccurrencesOfString:withString:]: unrecognized selector sent to instance 0x73f8eb0

Please help where i have to correct.

Answer 1

You are passing UIImage object in that function where as You should maintain the array of image names and pass that image name in this function & by the way you can simply get the name by removing extension by using this method:

[actual stringByDeletingPathExtension];

Here’s what you should do

imageary=[[NSMutableArray alloc]initWithObjects:@"dear.jpg",@"donkey.jpg",@"elephant.jpg",@"fox.jpg",@"giraffe.jpg",@"goat.jpg",@"buffallo.jpg",@"bull.jpg",@"cow.jpg",@"crocodile.jpg", nil]; // declare array of names not images
 - (NSString *) convertToDisplayName:(NSString *)actual
{
  return [actual stringByDeletingPathExtension]; //return image name without extension
}

Than this

int i=0;
for(UIView *view in self.view.subviews)
{
if([view isKindOfClass:[UIButton class]])
{
   mybutton = (UIButton *)view;
    if(mybutton.tag == 1||mybutton.tag == 2||mybutton.tag == 3||mybutton.tag == 4)
    {
         i = rand() % [imageary count]; // set random image
         animage.image=[UIImage imageNamed:[imageary objectAtIndex:i]]; // return image with this name
        name=[self convertToDisplayName:[imageary objectAtIndex:i]];
        [mybutton setTitle:name forState:UIControlStateNormal];
        NSLog(@"current image name :%@",name);
        i++;

    }
}
}

Hope that helps!