add image in horizontal scrollView not displaying images - ios

Question

I have added some images in scroll view I got prom is images not displaying on scroll view so please help, my code is below.
-(void)addscroll
{
CGFloat btnX = 160.0;
int numberOfButton = 10;
for (UIView *subview in scrollView.subviews) {
[subview removeFromSuperview];
}
for (int i = 1 ; i <= numberOfButton; i++)
{
UIImageView *img=[[UIImageView alloc]init];
img.image=[UIImage imageNamed:#"1.png"];
//img.tag = i;
//[button setTitle:#"Excavations" forState:UIControlStateNormal];
img.frame = CGRectMake(160.0, 200.0, 160.0, 40.0);
[scrollView addSubview:img];
btnX = btnX + 165.0;
}
scrollView.contentSize = CGSizeMake(btnX + 50, 150);
}

Answer 1

Try this,
-(void)addscroll
{
CGFloat btnX = 160.0;
int numberOfButton = 10;
for (UIView *subview in scrollView.subviews) {
[subview removeFromSuperview];
}
for (int i = 1 ; i <= numberOfButton; i++)
{
UIImageView *img=[[UIImageView alloc]init];
img.image=[UIImage imageNamed:#"1.png"];
img.frame = CGRectMake(btnX, 105, 160.0, 40.0);
[scrollView addSubview:img];
btnX = btnX + 165.0;
}
scrollView.contentSize = CGSizeMake(btnX + 50, 150);
}
You set x of img frame to 160.0, so all img will be added to the same position, change it to btnX and update btnX on each iteration. Next is contentSize of scrollView, its content height is set to 150 and img is added to y of 200. So content beyond the height of scrollview cannot be visible.

Answer 2

You are calculating wrong frame of image view
img.frame = CGRectMake(btnX, 200.0, 160.0, 40.0);

Answer 3

Your scrollview's height is 150, and your buttons y value is 200, that means is out of visible frame.

Answer 4

-(void)addscroll
{
CGFloat btnX = 160.0;
int numberOfButton = 10;
for (UIView *subview in scrollView.subviews) {
[subview removeFromSuperview];
}
for (int i = 0 ; i < numberOfButton; i++)
{
UIImageView *img=[[UIImageView alloc]init];
img.image=[UIImage imageNamed:#"1.png"];
//img.tag = i;
//[button setTitle:#"Excavations" forState:UIControlStateNormal];
img.frame = CGRectMake(i*btnX +10, 200.0, 160.0, 40.0);
[scrollView addSubview:img];
}
scrollView.contentSize = CGSizeMake((btnX + 10)*numberOfButton, 160);
}

Answer 5

Set img.frame = CGRectMake(160.0, 0, 160.0, 40.0);
By setting y = 200, you are making it out of visible parent's frame. Scroll's max height is 198, your image's y origin should be before that in order to make subview visible.

Answer 6

Use this code. Also make sure that img.image is not nil and "1.png" exists. You have limited the scroll to less than 200 while image start from 200 in y
-(void)addscroll
{
CGFloat btnX = 0;
int numberOfButton = 10;
for (UIView *subview in scrollView.subviews) {
[subview removeFromSuperview];
}
for (int i = 1 ; i <= numberOfButton; i++)
{
UIImageView *img=[[UIImageView alloc]init];
img.image=[UIImage imageNamed:#"1.png"];
img.frame = CGRectMake(btnX, 200.0, 160.0, 40.0);
[scrollView addSubview:img];
btnX = btnX + 165.0;
}
scrollView.contentSize = CGSizeMake(btnX + 50, 250);}