ScrollView Image -Page Control iOS - ios

Question

In the following implementation, images has been got from database, Once I put a debug point and see how many images that webservice returns, it shows five. However, on my scrollview, only three images appears.
-(void) setSizeSliding
{
for (int i = 0; i < colors.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
NSString*slidingImage = [[colors objectAtIndex:i] valueForKey:#"picture"];
NSURL *url = [NSURL URLWithString:slidingImage];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
UIImage *tmpImage = [[UIImage alloc] initWithData:data];
UIImageView *slidingImageView = [[UIImageView alloc]initWithFrame:frame];
slidingImageView.image = tmpImage;
[self.scrollView addSubview:slidingImageView];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * colors.count, self.scrollView.frame.size.height);
}
Update:
if I change the page control pages property, then I could able to scroll up to all five images. However, how could I avoid to put a const value?

Answer 1

Here is the solution, once I have added self.pageControl.numberOfPages into my code, it works.
-(void) setSizeSliding
{
for (int i = 0; i < colors.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
NSString*slidingImage = [[colors objectAtIndex:i] valueForKey:#"picture"];
NSURL *url = [NSURL URLWithString:slidingImage];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
UIImage *tmpImage = [[UIImage alloc] initWithData:data];
UIImageView *slidingImageView = [[UIImageView alloc]initWithFrame:frame];
slidingImageView.image = tmpImage;
[self.scrollView addSubview:slidingImageView];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * colors.count, self.scrollView.frame.size.height);
//solution
// the following code needs to be added to handle number of pages
self.pageControl.numberOfPages = colors.count;
}