Question

I have image Array with two images out of that first image its showing properly on image View, for that i write code in view Did Load as`

NSString *urlString=[NSString stringWithFormat:@"%@",[imageArray1 objectAtIndex:i]];
  NSLog(@"selected image:%@",urlString);
NSURL *url =[NSURL URLWithString:urlString];
NSData *imagedata =[[NSData alloc]initWithContentsOfURL:url];
UIImage *image=[[UIImage alloc]initWithData:imagedata];
[imgvw setImage:image];

Now i need to show next image on clicking bar button for that code is `

i=i+1;
NSLog(@"i=%d",i);
NSString *urlstr=[NSString stringWithFormat:@"%@",[imageArray1 objectAtIndex:i]];
NSLog(@"selected image:%@",urlstr);
NSURL *url =[NSURL URLWithString:urlstr];
NSData *imagedata =[[NSData alloc]initWithContentsOfURL:url];
UIImage *image1=[[UIImage alloc]initWithData:imagedata];
[imgvw setImage:image1];

but crashes at line `NSString *urlstr=[NSString stringWithFormat:@"%@",[imageArray1 objectAtIndex:i]];
I didn’t understand why it happens please suggest something?

Answer 1

int i=0;

NSString *urlString=[NSString stringWithFormat:@"%@",[imageArray1 objectAtIndex:i]];
SURL *url =[NSURL URLWithString:urlString];
NSData *imagedata =[[NSData alloc]initWithContentsOfURL:url];
UIImage *image=[[UIImage alloc]initWithData:imagedata];
[imgvw setImage:image];


in button action event.

if(i<[imageArray1 count]-1)
{
i++;

NSString *urlString=[NSString stringWithFormat:@"%@",[imageArray1 objectAtIndex:i]];
SURL *url =[NSURL URLWithString:urlString];
NSData *imagedata =[[NSData alloc]initWithContentsOfURL:url];
UIImage *image=[[UIImage alloc]initWithData:imagedata];
[imgvw setImage:image];


}
else
{
// 
/NSLog(@" you reach the last items ");

}