I have 4 labels on UIViewController. Now I want to know how can i make my current view to scrollable view using UIScrollView ?
You have to create and add these labels there. Something like this (Warning: untested)
UIScrollView * content = [[UIScrollView alloc] initWithFrame:self.view.bounds];
[content setContentSize:CGSizeMake(width, height)];
//Here you can add those labels to content view
[self.view addSubView:content];
To get scrolling to work you must specify size of the content (setContentSize:) larger than main view size. And don't forget to release the scroll view.
Simplest method:
-(void)scrollview
{
UIScrollView *scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(10, 10, 250, 150)];
scrollview.showsVerticalScrollIndicator=YES;
scrollview.scrollEnabled=YES;
scrollview.userInteractionEnabled=YES;
scrollview.backgroundColor = [UIColor greenColor];
[mainScrollView addSubview:scrollview];
scrollview.contentSize = CGSizeMake(250,150);
}
Related
My UIScrollView isn't scrolling. (I'm trying to get it to scroll horizontally) I'm setting the contentSize to be (960, 300). I have set the framesize of the UIScrollView to be width:320 height:300 in the storyboard.
I have a container view inside the scroll view that has a width of 960 points.
At 320 points, I have a subview that has a background color of brown. When I scroll, I can see the brown subview, but it bounces back when I let go of the drag.
This is my viewDidLoad method:
- (void)viewDidLoad
[super viewDidLoad];
self.scrollView.scrollEnabled = YES;
[self.scrollView setFrame:CGRectMake(0,0,320,300)];
self.scrollView.contentSize = CGSizeMake(960, 300);
UIView *subview1 = [[UIView alloc] initWithFrame:CGRectMake(320, 0, 320, 300)];
[subview1 setBackgroundColor:[UIColor brownColor]];
UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 960, 300)];
[containerView addSubview:subview1];
[self.scrollView addSubview:containerView];
}
Here is a sample code for create a scroll view programmatically:
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];
scrollView.backgroundColor = [UIColor redColor];
scrollView.scrollEnabled = YES;
scrollView.contentSize = CGSizeMake(960, 300);
[self.view addSubview:scrollView];
UIView *subview1 = [[UIView alloc] initWithFrame:CGRectMake(320, 0, 320, 300)];
[subview1 setBackgroundColor:[UIColor brownColor]];
UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 960, 300)];
containerView.backgroundColor = [UIColor greenColor];
[containerView addSubview:subview1];
[scrollView addSubview:containerView];
So, there is no issue in your code, but something wrong with your storyboard configure.
I have a few thoughts about what you are trying to accomplish. I don't know how old is your code, but today we have many better ways to work with scrollview and they don't include setting up the intrinsic size or fame.
Well, despite my doubt about the objective of the code, I tried to run it here, using storyboard, a single view, a default configured scrollView and the experiment went well, your code actually works, I think maybe you have some problem with your scrollView. I know this will sound weird but did you checked if the scrollView has the property "Scrolling Enabled" checked?
If you can give me more information about this issue, I can help you.
Please tell me how to set scrollview inside a scrollview like nested process.
The following code works partially.
int x=10;
int y=10;
for(int i=0; i<5; i++)
{
UIScrollView *scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(x, y, 50, 50)];
scrollview.showsVerticalScrollIndicator=YES;
scrollview.scrollEnabled=YES;
scrollview.userInteractionEnabled=YES;
scrollview.backgroundColor = [UIColor greenColor];
[self.view addSubview:scrollview];
scrollview.contentSize = CGSizeMake(50,50);
y=y+95;
}
Now all I can see are 3 scrollviews and the others are hidden. How can I create main scroll to view so that the child scrollViews are not hidden?
You need to have an initial scrollView that you then put these scrollViews in.
UIScrollView * mainScrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
mainScrollView.contentSize = CGSizeMake(50, (y + 95) * 5);
// further configure
[self.view addSubview: mainScrollView];
Then change
[self.view addSubview:scrollview];
To
[mainScrollView addSubview: scrollView];
//I have created Two Scroll view programmatically this way
UIScrollView *scrollViewOuter = [[UIScrollView alloc] initWithFrame:CGRectMake(100.0f, 100.0f, 600.0f, 600.0f)];
scrollViewOuter.backgroundColor = [UIColor scrollViewTexturedBackgroundColor];
scrollViewOuter.contentSize = CGSizeMake(2000.0f, 2000.0f);
UIScrollView *scrollViewInner = [[UIScrollView alloc] initWithFrame:CGRectMake(10.0f, 10.0f, 200.0f, 200.0f)];
scrollViewInner.backgroundColor = [UIColor whiteColor];
scrollViewInner.contentSize = CGSizeMake(2000.0f, 2000.0f);
[scrollViewOuter addSubview:scrollViewInner];
[self.window addSubview:scrollViewOuter];
//You can change frame and use in your own way
Just create a parent scrollview that is big enough to hold the 5 smaller ones, then change this line:
[self.view addSubview:scrollview];
to
[parentScrollView addSubview:scrollview];
I have created a scrollview programmatically in ios.
I am displaying 2-3 images on that scrollview and adding images vertically one below other.
When I touch on the image and scroll vertically it works. But if I touch the empty space between the images and try to scroll it does not work. Scrollview does not respond to that.
Here is the relevant code :
UIImageView* imageView = [[UIImageView alloc] initWithFrame:imageRect];
[imageView setImage:[UIImage imageNamed:#"background.png"]];
[scrollView addSubview:imageView];
[self didAddSubview:imageView];
.....
......
[scrollView setScrollEnabled:YES];
[[self view] addSubview:scrollView];
Any inputs will be helpful.
Thanks.
You can set the content size of scrollView use this code hope it will help you :-
- (void) viewDidLoad
{
[super viewDidLoad];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
[scrollView setScrollEnabled:YES];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 20, 250, 200)];
[imageView setImage:[UIImage imageNamed:#"background.png"]];
[scrollView addSubview:imageView];
[self.view addSubview:scrollView];
scrollView.contentSize = CGSizeMake(320, 600);
}
Set,
[scrollView setFrame:size];
[scrollView setContentSize:contentsize];
If it will not scroll vertically or horizontally then you have to change content size it should be greater then current size.
This question is old but I was having the exact same issue with my scrollview, and this was the only page I found about this all over the internet.
I was using a content view inside scroll view, and I just set a background color on my contentView and it worked.
Content size was being set automatically throw auto layout, so no need to set it manually.
I'm trying to add a scrollview to my UIView, and put a label, textview, image on it but the scroll bar doesn't show up and I can't scroll.
//faux view
UIView* fauxView = [[[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)]autorelease] ;
[self.bgView addSubview: fauxView];
//the new panel
self.bigPanelView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, self.bgView.frame.size.width, self.bgView.frame.size.height)]autorelease];
self.bigPanelView.center = CGPointMake( self.bgView.frame.size.width/2, self.bgView.frame.size.height/2);
self.bigPanelView.backgroundColor = self.initialBackgroundColor;
UIScrollView * scroll = [[UIScrollView alloc] initWithFrame:self.bigPanelView.bounds];
[scroll setContentSize:CGSizeMake(200, 200)];
[self.bigPanelView addSubview:scroll];
scroll.showsVerticalScrollIndicator = YES;
// add label
UILabel *lblTitle = [[[UILabel alloc] initWithFrame:CGRectMake(0, 25, self.bgView.frame.size.width, 46)]autorelease];
// If I change the 25 to 235 the label will come under the screen but still I cannot scroll.
lblTitle.textAlignment = NSTextAlignmentCenter; // Align the label text in the center
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.text = self.initialTitle;
lblTitle.textColor = self.initialTitleColor;
lblTitle.font = [UIFont systemFontOfSize:31];
[scroll addSubview: lblTitle];
You have to make the scrollview's contentSize larger than the view:
[scroll setContentSize:CGSizeMake(200, 200)];
needs to be something like:
[scroll setContentSize:CGSizeMake(400, 400)];
Of course, make that the size of the content of whatever you're going to put the scroll view, and that way, it only scrolls if needs to.
For Scrolling - The scrollView contentSize should be larger then the scrollView frame.
Within my UIView, I have a UIScrollView which fills the first view, so than when the content is bigger than the iPhone screen size, the user can scroll the page down. It works well, but when the user finishes the scroll movement - i.e. removes his fingers, the page snaps back into it's original position. Obviously that is not what I want, how can it be avoided?
Here is the relevant code in the UIView class which declares and uses the UIScrollView class.
#implementation TestView
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code.
}
CGRect scrollViewFrame = CGRectMake(0, 0, 320, 460);
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:scrollViewFrame];
scrollView.canCancelContentTouches=NO;
[self addSubview:scrollView];
CGSize scrollViewContentSize = CGSizeMake(320, 500);
[scrollView setContentSize:scrollViewContentSize];
CGRect rectForBigRedSquare = CGRectMake(50, 50, 200, 200);
UILabel *redSquare = [[UILabel alloc] initWithFrame:rectForBigRedSquare];
[redSquare setBackgroundColor:[UIColor redColor]];
[scrollView addSubview:redSquare];
return self;
}
An additional question is this: how is it possible to make it such that the user can only scroll down, that is to see content at the bottom which was out of view, but not to scroll up so that there is space before the start of the content. In
Basically you just have to set contentSize of your scrollview according to the contents.
CGSize scrollViewSize = CGSizeMake(newWidth, newHeight);
[self.myScrollView setContentSize:scrollViewSize];
Okay, the easiest way to get this scrollview working as you desire is to ensure that content size of the scrollview is identical to the frame size of the content you wish to scroll.
You can achieve this by having a content view into which you add all the views you wish to be visible and then add that content view to the scrollview while ensuring that the content size of the scrollview is set to the content view's frame size.
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
UIView* contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1280, 460)];
UIView* redView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
[redView setBackgroundColor:[UIColor redColor]];
[contentView addSubview:redView];
[redView release];
UIView* blueView = [[UIView alloc] initWithFrame:CGRectMake(960, 0, 320, 460)];
[redView setBackgroundColor:[UIColor blueColor]];
[contentView addSubview:blueView];
[blueView release];
CGSize contentViewSize = contentView.frame.size;
[scrollView addSubview:contentView];
[scrollView setContentSize:contentViewSize];
[contentView release];
[self addSubview:scrollView];
The app I was working on had similar symptoms. The user could scroll down but on release the view would snap back to the initial position. The page was set up as follow:
[VIEW]
[SAFE AREA]
[SCROLL VIEW]
[CONTENT VIEW]
I strongly suspect that a combination of Auto-Layout and manual constraints caused by several adjustment iterations was causing the issue. To resolve this all constraints where removed from the View.
The Scroll View was assigned the following constraints:
Scroll View.leading = Safe Area.leading
Scroll View.top = Safe Area.top
Scroll View.trailing= Safe Area.trailing
Scroll View.bottom = Safe Area.bottom
The Content View was then assign the following constraints
ContentView.Leading = Scroll View.Leading
ContentView.top = Scroll View.top
ContentView.centerX = ScrollView.centerX
The Content View was also given the following self constraint
height = 1000