I am trying to resize UIScrollView inside a UICOllectionViewCell but it doesn't resize it.
-(int)resizeScrollView:(int)height{
NSLog(#"Before Scroll height %f",self.scrollView.frame.size.height);
float currentHeight=self.scrollView.frame.size.height+height+200;
NSLog(#"height %f",currentHeight);
CGSize size=CGSizeMake(self.scrollView.frame.size.width ,
currentHeight + 10 );
[self.scrollView setContentSize:size];
self.scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
NSLog(#"After Scroll height %f",self.scrollView.frame.size.height);
return currentHeight;
}
Setting the contentSize adjusts the amount of logical space that the scroll view scrolls over. You need to set the frame or the bounds to adjust the size of the scrollview in its parent view.
CGRect scrollFrame = self.scrollView.frame;
scrollFrame.size.height += height + 210;
self.scrollView.frame = scrollFrame;
Related
I have a view with 1 tableView which is allocated 50% of screen height and 100% of screen width.
I have following code:
tableView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleWidth;
//tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
However, when I rotate the screen/device, height does not adjust to 50% of new orientation. width does adjust to 100%
How can I get height adjusted as well, if its possible?
At first, you need to setup frames; tableView's superview frame must not be empty:
tableView.superview.frame = CGRectMake(0, 0, 320, 480);
Then, setup tableView frame and masks:
CGRect frame = tableView.superview.frame;
frame.size.width /= 2;
tableView.frame = frame;
tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
So I know there are already a lot of questions about this subject, but I haven't found one that has solved my problem (or perhaps I don't understand the answer).
Alright, so I have set up a scrollview that has an UIView in it, containing an image view at the top (a gradient view which you can ignore), and a textview under it. The textview has to expand with whatever is put inside of it without scrolling (hence why it's in the scrollView).
I have in code:
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
[self setupGradientView];
[self resize];
}
- (void) resize {
CGFloat maxWidth = [[UIScreen mainScreen] bounds].size.width;
CGRect newFrame;
// reset width for scrollview
newFrame = imageView.frame;
newFrame.size = CGSizeMake(maxWidth, imageView.frame.size.height);
imageView.frame = newFrame;
gradientView.frame = newFrame;
newFrame = textView.frame;
newFrame.size = CGSizeMake(maxWidth, textView.frame.size.height);
//textView.frame = newFrame;
newFrame = dummyView.frame;
newFrame.size = CGSizeMake(maxWidth, dummyView.frame.size.height);
dummyView.frame = newFrame;
// resize height
CGFloat fixedWidth = textView.frame.size.width;
CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, CGFLOAT_MAX)];
newFrame = textView.frame;
newFrame.size = CGSizeMake(fixedWidth, newSize.height);
//textView.frame = newFrame;
self.textViewHeightConstraint.constant = newSize.height;
CGFloat dummyViewHeight = textView.frame.origin.y + textView.frame.size.height;
dummyView.frame = CGRectMake(dummyView.frame.origin.x, dummyView.frame.origin.y, dummyView.frame.size.width, dummyViewHeight);
[scrollView setContentSize:dummyView.frame.size];
}
Unfortunately, the content size seems to be off by what I think may be 16pts, resulting in a view that looks like this with the text cut off (don't mind the unicode mess in the text):
Here's a picture of what the view looks like in IB: https://i.imgur.com/hxzzUg2.png
Here's what the constraint hierarchy looks like: https://i.imgur.com/rUepwa2.png
Any help would be greatly appreciated!
EDIT: If I comment out the entire code in the resize function, I get the same result. It would appear that auto-layout is resizing all of this after the function is called...but I thought auto-layout was completed when viewDidLayoutSubviews was called?
Edit 2: I have tried and found that adjusting the frame of the textView even n viewDidAppear has no effect. (I can edit things such as the background color)
What I ended up having to do was setting equal width and equal height to the view (not the scrollview), and then manually changing the height constraint in viewDidLayoutSubviews, along with changing the frame of the textView and the content size of the scrollView.
I have a UIScrollView with a number of children UITextViews arranged vertically. I want the UIScrollView to resize to fit content. So my TextViews I do
- (void)textViewDidChange:(UITextView *)textView
{
CGFloat fixedWidth = textView.frame.size.width;
CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
CGRect newFrame = textView.frame;
newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
textView.frame = newFrame;
[textView setNeedsLayout];
}
And for the scrollview I do
-(void)resizeScrollViewToFitContent
{
CGRect contentRect = CGRectZero;
for (UIView *view in self.scrollView.subviews) {
contentRect = CGRectUnion(contentRect, view.frame);
}
self.scrollView.contentSize = contentRect.size;
}
I call [self resizeScrollViewToFitContent] inside viewDidAppear. Any ideas why this setup is not working?
I am not sure how is the arrangement of your textViews inside the scrollView. I assume that they are arranged vertically right next to each other. I have created a sample project with a scrollView and 3 textViews and it works well with the following code:-
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
CGFloat height = self.textView1.frame.size.height +self.textView2.frame.size.height +self.textView3.frame.size.height ;
CGSize size = CGSizeMake(self.scrollView.frame.size.width, height);
self.scrollView.contentSize = size;
}
From my own project, the content Height of the scrollview is the combination of the height for all 3 textviews. It might be different in your project.
You shouldn't be doing the union of the contentFrame and view.frame. Try the following:
-(void)resizeScrollViewToFitContent
{
UIScrollView* scrollView;
CGSize contentSize = CGSizeZero;
for (UIView* subview in scrollView.subviews)
{
CGFloat subviewRight = CGRectGetMaxX(subview.frame);
if (subviewRight > contentSize.width)
{
contentSize.width = subviewRight;
}
CGFloat subviewBottom = CGRectGetMaxY(subview.frame);
if (subviewBottom > contentSize.height)
{
contentSize.height = subviewBottom;
}
}
scrollView.contentSize = contentSize;
}
One small thing worth noting: a UIScrollView's scroll indicators are subviews of any UIScrollView. This has the potential to throw off the above code's accuracy, but I've found that it always works except in some very particular cases.
If you know how many subviews are in your scrollview per row then you'll want to do a little math to find the correct height.
For example, you might have a uiview with a uiimageview and uilabel, so you're subview count will be 3 times what it should be.
try
// csv = contentscrollview
NSLog(#"%d", [[csv subviews] count] / 3);
I have a storyboard with a view, but all my UIViews (actually UIViewTable and UIScrollView) appear to have a frame.width and frame.height of 0.
I can clearly see them in the simulator.
- (void) viewDidAppear:(BOOL)animated{
// check frame size of tableView
NSLog(#"Frame width = %f, height = %f", self.tableView.frame.size.width, self.tableView.frame.size.height);
// check contentSize of tableView
NSLog(#"contentSize width = %f, height = %f", self.tableView.contentSize.width, self.tableView.contentSize.height);
// check frame size of scrollView
NSLog(#"scrollView size - width = %f, height = %f", self.scrollView.frame.size.width, self.scrollView.frame.size.height);
[super viewDidAppear:animated];
}
All these logs show 0 for the height and the width.
I'm creating several scroll views in one view that scroll horizontally. The following code works fine:
-(void)updateSection {
builder = [NSMutableArray array];
float xPosition = 0;
float xposbut = 100;
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 100, self.frame.size.width, self.frame.size.height - 69)];
scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
scrollView.delegate = self;
[self addSubview:scrollView];
for (int i = 1; i < itemArticleArray.count; i++) {
ItemView *item = [ItemView loadNibs];
item.frame = CGRectMake(xposbut, 10, item.frame.size.width, item.frame.size.height);
xPosition += scrollView.frame.size.width + 2;
xposbut += 500;
UIView *seperatorView = [[UIView alloc] initWithFrame:CGRectMake(xposbut - 50, 4, 2, scrollView.frame.size.height - 8)];
[scrollView addSubview:seperatorView];
xPosition += scrollView.frame.size.width + 4;
[scrollView addSubview: item];
[builder addObject:item];
}
[scrollView setContentSize:CGSizeMake(xposbut, scrollView.frame.size.height)];
[self addSubview:scrollView];
}
However, when I change the 8th line of code to the following:
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 400, self.frame.size.width, self.frame.size.height - 69)];
It cause the layout to look fine, but the scroll views do then not scroll at all. Any ideas?
you set the contentSize.height to the scrollView.frame.size.height and so the scrollView cant scroll. you have to set the contentSize to the total height of you scrollView, including the not visible area. The frame is only the area on screen.
UIScrollview will scroll when content size is bigger then frame size. In your code you set content size equal to frame size that's why your scrollview is not scrolling.
Set the content size for the scroll view. The content size should be greater than frame.size, then only the scroll view will scroll. And also enable scrolling.
Use the code
scrollView.scrollEnabled=YES;
scrollView.contentSize=CGSizeMake(CGFloat width, CGFloat height);
Height should be greater than scrollView.frame.size.height and add contents inside scrollview beyond the scrolview's frame.
You must give the scroll some space to work so check this out:
Create the scroll in the storyboard
Create an outlet for the scroll
And the in the .m file you must paste these lines
The code:
(void)viewDidLoad {
[super viewDidLoad];
yourScroll.scrollEnabled=YES;
yourScroll.contentSize=CGSizeMake(self.view.frame.size.width, self.view.frame.size.height*2);
}
/*
* yourScroll.contentSize=CGSizeMake(your desired scroll width, your desired scroll height);
* The values must be bigger than the viewController size
*/