CODEWITHSUNDEEP
objective-cxcodeuiscrollview
Konrad Kolasa
Konrad Kolasa

Reputation: 621

How to set size of UIScrollView frame programmatically?

I am newbie so my question can be really obvious, but I didn't find any solution so far.

I did in IB UIScrollView and connected it with File's Owner. I would like to set now the frame size of my UIScrollView (named ScrollView).

const CGFloat BoardWidth = 320;
const CGFloat BoardHeight = 400;

//I tried this way but 'Expression is assignable' - said Xcode
ScrollView.frame.size.width = BoardWidth;
ScrollView.frame.size.height = BoardWidth;

So how can I the easiest set own sizes of ScrollView frame?

Upvotes: 14

Views: 48130

Answers (5)

sch
sch

Reputation: 27506

CGRect scrollFrame = CGRrectMake(x, y, w, h);
ScrollView.frame = scrollFrame;

Or if you need only to change the width and height;

CGRect scrollFrame;
scrollFrame.origin = ScrollView.frame.origin;
scrollFrame.size = CGSizeMake(w, h);
ScrollView.frame = scrollFrame;

Edit keeping the center unchanged:

CGRect scrollFrame;
CGFloat newX = scrollView.frame.origin.x + (scrollView.frame.size.width - w) / 2;
CGFloat newY = scrollView.frame.origin.y + (scrollView.frame.size.height - y) / 2;
scrollFrame.origin = CGPointMake(newX, newY);
scrollFrame.size = CGSizeMake(w, h);
scrollView.frame = scrollFrame;

Upvotes: 17

Lorenzo B
Lorenzo B

Reputation: 33428

you need to do this, for example.

ScrollView.frame = CGRectMake(0, 0, BoardWidth, BoardHeight);

Once done you need also to set contentSize property. It's the area that 'extends' behind the frame of your UIScrollView.

If you want to scroll only horizontally:

ScrollView.contentSize = CGSizeMake(w * BoardWidth, BoardHeight);

If you want to scroll only vertically:

ScrollView.contentSize = CGSizeMake(BoardWidth, h * BoardHeight);

If you want to scroll both horizontally and vertically:

ScrollView.contentSize = CGSizeMake(w * BoardWidth, h * BoardHeight);

where w and h are generic values to increment your width and/or your height.

If you want have an horizontal (for example) discrete scroll (e.g. you have some pages with the same dimension of your screen).

ScrollView.pagingEnabled = YES;
ScrollView.contentSize = CGSizeMake(p * BoardWidth, BoardHeight);

where p is the number of pages you want to display.

Hope it helps.

Upvotes: 5

Shubhank
Shubhank

Reputation: 21805

CGRect Frame = ScrollView.frame

Frame.frame.size.width = BoardWidth;
Frame.frame.size.width = BoardWidth;

ScrollView.frame = Frame;

Since frame is a structure..you can't set the frame of an object directly.. You will have to make a Cgrect and then manipulate it.

Upvotes: 1

cocoakomali
cocoakomali

Reputation: 1356

You can do it as below,

scrollView.frame = CGRectMake(xOrigin,yOrigin,width,height);

If you are looking for content size of scrollview then it as below,

scrollView.contentSize = CGSizeMake(width,height);

Upvotes: 4

moxy
moxy

Reputation: 1624

using contentSize property

ScrollView.contentSize = CGSizeMake(320, 520);

it needs to be bigger than the frame so it actually scrolls.

Upvotes: 0

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