Adding UIImageView to UIScrollView programmatically - ios

Question

I'm trying to create programmatically a UIScrollView containing a UIImageView. The image of the UIImageView should be scrolled vertically, my problem is that the UIScrollView is never added to my main View.
Here's the code
#property (strong, nonatomic) UIImageView *advertiseView;
#property UIScrollView *sv;
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
_sv = [[UIScrollView alloc] init];
_advertiseView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,568)];
UIImage *image = [UIImage imageNamed:#"abc.png"];
_advertiseView.image = image;
_advertiseView.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size};
[_sv addSubview:_advertiseView];
_sv.contentSize = CGSizeMake(320,1136); // size of abc.png
[self.view addSubview:_sv];
}
What am i missing??

Answer 1

You don't set the ScrollView size. Try this:
_sv = [[UIScrollView alloc] initWithFrame:self.view.bounds];

Answer 2

int width = 0;
int height = 0;
for (int i=0; i<[menupicarray count]; i++)
{
NSString *menupicname=[NSString stringWithFormat:#"%#",[menupicarray objectAtIndex:i]];
UIImageView *imageView = [[UIImageView alloc] init ];
[imageView setImageWithURL:[NSURL URLWithString:menupicname]
placeholderImage:[UIImage imageNamed:#"NOmage.png"]];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.clipsToBounds = YES;
imageView.frame = CGRectMake( MenuView.frame.size.width*i,0, MenuView.frame.size.width, MenuView.frame.size.height-5);
[MenuView addSubview:imageView];
width = imageView.frame.size.width;
height = imageView.frame.size.height;
MenuView.contentSize = CGSizeMake(width*i+imageView.bounds.size.width, height);
}