CODEWITHSUNDEEP
objective-ciosuiscrollviewxcode4.5
ios85
ios85

Reputation: 2134

UIScrollView not scrolling when adding item in IB and code

When I create a Scrollview on my scene, and then add a button to scene in IB. Then I go into the code, set the content size, enable user interaction and add another button. When I run the program in the simulator the Scrollview does not work, if I remove the button that is in IB on the scene it works just fine. Is it not possible to add items to the scrollview both in IB and programmatically?

EDIT: I thought it may be something in the app I already had. So I decided that I would create anew project and all it has in it is code, and the scene picture below. It is indeed added below the ScrollView.

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton setTitle:@"My Button" forState:UIControlStateNormal];
myButton.frame = CGRectMake(100, 100, 150, 50);
[scrollView addSubview:myButton];
scrollView.userInteractionEnabled = YES;
[scrollView setContentSize:CGSizeMake(320, 1000)];

enter image description here

Upvotes: 2

Views: 2535

Answers (5)

Mouhamad Lamaa
Mouhamad Lamaa

Reputation: 884

check d2burke answer in this question you should place your code in viewWillLayoutSubviews instead of viewDidAppear

Upvotes: 0

boulette
boulette

Reputation: 113

Here is an helpful link: http://developer.apple.com/library/ios/#releasenotes/General/RN-iOSSDK-6_0/_index.html#//apple_ref/doc/uid/TP40012166-CH1-SW19

Basically what this says is that, with auto-layout you don't and shouldn't have to use setContentSize:. Instead your inner view should have it's edges snapped to the edges of the scrollview. Let me demonstrate how I solved it.

scrollBackground : a view that contains every other view that needs to scroll in the scrollview.

[scrollview addSubview:scrollBackground];

[scrollview addConstraints:[NSLayoutConstraint 
       constraintsWithVisualFormat:@"V:|[scrollBackground(1000.0f)]|" 
       options:0 metrics:nil 
       views:NSDictionaryOfVariableBindings(scrollBackground)]];

[scrollview addConstraints:[NSLayoutConstraint 
       constraintsWithVisualFormat:@"H:|[scrollBackground(==scrollview)]|" 
       options:0 metrics:nil 
       views:NSDictionaryOfVariableBindings(scrollBackground)]];

The key here being those | at beginning and end of the VisualFormat String. These will tell the scrollview what is the contentSize. Of course if you have a contentSize smaller than the frame size of the scrollview it won't scroll in that direction. In my example this is true for width. It only scrolls up and down.

Upvotes: 4

vishy
vishy

Reputation: 3231

Here your scrollView is not scrolling due to the autoLayout, uncheck the auto Layout if you are not using.

I Just made a similar to your requirement. It is working fine, and after allowing autoLayout it just stopped scrolling.

The auto layout constraints fits to the visible part of the screen, if the objects in scrollView are more then screen size, it will scroll.

So my suggestion if you are not using autoLayout just uncheck it, and works fine.

Upvotes: 4

Aaron Brager
Aaron Brager

Reputation: 66302

In the case you posted, the scrollview will not scroll because all of the content is visible. Try changing that last line to:

[scrollView setContentSize:CGSizeMake(50, 50)];

and it will start scrolling, because the content size is smaller than all of the content in the view.

Upvotes: 1

ekinsol
ekinsol

Reputation: 531

Make sure you set your content size in viewDidLoad or at some point after the view has already been loaded from the nib file.

As vishy Pointed out, your Button should be part of the ScrollView's Hierarchy, else you'll just be scrolling an empty view.

Upvotes: 1

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