My problem are:
I implement a UIScrollView (DrawView)to draw something on it(Task is ok).
I drag a ScrollView to ViewController using storyboard and assign DrawView class to it.
I using pink gesture to zoom one element in DrawView, it is correct, but when element out of size DrawView i cant scroll it to see part of element.
In file ViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
[self.drawingView setScrollEnabled:YES];
[self.drawingView setContentSize:CGSizeMake(100, 200)];
}
Can you give me way to solution problem or some tutorial same?
Thank for all
Sorry for bad grammar
Set content size of the scrollView as the size of the element which you are adding to it.
Say elementView is the view that you are adding to scroll view then,
[self.drawingView setContentSize:elementView.size];
According to your comment, drawingview size is 700x900 which is less than your content size 100 x 200. That's why, it couldn't get scroll. Content size should be greater than size, then only it will get scroll even scrolling enabled.
Related
I'm loading a view from a storyboard programatically, but there's an issue with my subview heights (I'm using Autoresize Subviews etc).
When the view loads, the main UIView appears to be the correct size, but the subviews that depend on the constraints to dynamically calculate their final height don't seem to be resizing from the sizes they were set at in interface builder.
Loading the view like so:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
ApplicationRecordingViewController* recordingController = (ApplicationRecordingViewController*)[storyboard instantiateViewControllerWithIdentifier:#"recordView2"];
[self presentViewController:recordingController animated:NO completion:nil];
Orange area's height is from top of main view to top of grey area. Grey area is fixed height
The strange thing is, if I set the simulated size in interface builder as the correct view for my phone, the sizes work out. I guess the initial heights for subviews are 'baked' into the view, but then (usually) resized when the view actually loads?
Note: The orange area should be completely filled by the camera view I'm loading into it.
Incorrect height
Correct height if I change simulated layout
Would love to know what I'm doing wrong!
Edit 1: Constraints
Camera is the orange bit. The Camera bottom constraint is currently set as the bottom of the view + enough room for the gray bar. Have also tried setting the bottom to match the top of the gray bar!
Link to Storyboard with Scene
I know you're all better than me, but I experienced the same in my last project. My Camera View inside a UIView is not in full screen or resizing and fitting the whole UIView, and I also posted it on my daily blog.
Implement viewDidLayoutSubviews -- Inside that method, layout again your video preview layer.Do not alloc init anything inside that method, just re-layout your views. After that, your video preview will fill the height and width of its parent, or whatever you've been targetting.
The issue also has something to do with the hierarchy of the constraints and views.
You already got the answer.
'if I set the simulated size in interface builder as the correct view for my phone, the sizes work out.'
You may call some functions to get height in viewDidLoad or viewWillAppear.
Change Code like this
- (void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.view setNeedsLayout];
[self.view layoutIfNeeded];
CGFloat height = [self getHeight];
}
or
- (void) viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
CGFloat height = [self getHeight];
}
As i can see in your storyboard constrain you have set bottom space to bottom layout guide 150 . i think this is the issue . if you give fixed height to bottom view then no need to set constant as from bottom layout guide --> 150 .
Your old constrain :- >
Just set bottom space of orangeview from greenview = 0.
Check new constrain ,
Here is your storyboard link ,
Storyboard Download link
Here is your output,
After investigating the layout a little more, I found the camera view (orange) seemed to be the correct size, but the live camera preview wasn't.
Solution was to move the camera library (SCRecorder)'s init method into viewDidAppear (was in viewDidLoad before).
My thinking is iOS doesn't autolayout the camera preview view in the same way as normal UIViews, etc.
#interface ApplicationRecordingViewController () {
SCRecorder *_recorder;
}
#end
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
_recorder.previewView = _previewView;
}
Perhaps you can try to get rid of these two hook.
I have built a large IOS app and whilst testing noticed that a uiScrollview within a static page has stopped scrolling - to explain the setup of the page - the structure is as follows -
the scrollview is connected to the header file as scwollMa (as in above doc).
it has the following properties in storyboard -
I have applied the following into the .m page -
- (void)viewDidLoad
{
[super viewDidLoad];
//Set Scroller
[_scwollMa setScrollEnabled:YES];
self.scwollMa.contentSize = CGSizeMake(320, 1100);
Yet it does nothing! no error either - big head scratcher! Any advice at all?
You have set the height of the scrollview at the same height as the content size. To scroll set the height of the scroll view to fit into the visible screen area (like self.view.frame.size.height).
If the scroll view and the content view have the same height, there's nothing to scroll for.
contentSize.Height must be greater to actual.height:
Change the following line of code to
self.scwollMa.contentSize = CGSizeMake(320, 1500);
will work for you.
and in interface builder keep height which is visible inside your view.
I have two questions related to UITableViews.
1) The first one is, what is the gap at the top of the UITableView? My app always starts with the top cell not flush with the top of the tableview (as shown in the second image), it starts about one cell lower, i.e. where that gap is in the interface builder. I can't find where that is coming from, or why.
2) I can't seem to resize the uitableview programmatically, I'm trying to reduce the height after a popup appears. I've shown an example of it not working in the second picture.
Here is (an example of) what I am trying at the moment:
- (void)viewDidLoad
{
[super viewDidLoad];
self.table_view.delegate = self;
CGRect tableBounds = self.table_view.bounds;
tableBounds.size.height -= 100;
self.table_view.bounds = tableBounds;
CGRect tableFrame = self.table_view.frame;
tableBounds.size.height -= 100;
self.table_view.frame = tableFrame;
}
Thanks!
UITableView Selected:
Simulation:
In your xib (or storyboard) put your UITableView at position (0,0). ( the same position as the navigation bar).
The first image shows that your table view has problems even in Interface Builder. It looks as if you've set the top inset incorrectly; check your edge insets.
The reason your resizing code is not working is probably that it is too early (viewDidLoad); put it in viewDidAppear: and see if that works, and if it does, try moving it back to viewWillAppear: so the user doesn't see the resizing. If it doesn't work, it might be because you're using auto layout; you can't manually alter the frame of something whose frame is dictated by auto layout. (Your resizing code is also silly; you want to set the frame, not the bounds.) But it might also be because you're using a UITableViewController in a UINavigationController; if you do that, the table view is under the navigation controller's direct control and its size is not up to you.
I am quite new to iOS application development.
I was working with UIScrollView and found very strange behavior. Hope somebody could explain this to me.
I tried the two methods and found the outputs different.
1). UIScrollView is added to my view in the Interface Builder, and a view (UIView) is also added to the scrollview earlier. I set the view's bounds manually in the IB, and set the scrollview's content size in the class file.
Observation : The scrollview doesn't scroll with the setcontentsize, rather takes some unusual content size, independent of anything else, even its own bounds.
2). The same UIScrollView is again added in the Interface Builder, but the view is added this time programmatically.
Observation : This time everything works out quite good.
I don't understand what could have gone wrong.
Can anyone explain and elaborate
I'm not sure exactly what your problem is, but if you want to be able to add views to a UIScrollView in IB, create a UIScrollView subclass and do something like this:
- (void)awakeFromNib
{
[super awakeFromNib];
CGRect bounds = CGRectZero;
for (UIView* view in self.subviews)
{
bounds = CGRectUnion(bounds, view.frame);
}
[self setContentSize:bounds.size];
}
So a little explanations of what my view is doing before the problem, the page loads a bunch of buttons that are clickable into the contentView which is a subView of my scrollView.
i got a UIViewController, inside i have my
UIScrollView scrollView to handle the scrolling and zooming
UIView contentView which i add all the UIButtons to.
Alright i'll try to only put the code which i believe might need to be changed.
in viewDidLoad
scrollView.contentSize = CGSizeMake(320, (20+totalRows*OFFSET_Y) );
[scrollView setMaximumZoomScale:4];
[scrollView setMinimumZoomScale:1];
[scrollView setDelegate:self];
[contentView setFrame:CGRectMake(0, 0, 320, (20+totalRows*OFFSET_Y) )];
[self.scrollView addSubview:contentView];
Doing some calculation to see how big i need to content size to be to fit all the buttons, then i add the contentView as subView to my scrollView.
I then add all the UIButtons as subview of my contentView
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return [self contentView];
}
Got my delegate method for zooming returning the contentView.
Ok so everything is scrollable and zoomable like it should be..all my UIButtons are still clickable and works how it should be.
The problem is after i zoom in/out when i scroll all the way to the bottom of my scrollView it's being cut off from the bottom, so the last row of buttons are being cut in half. even when i rezoom to 1:1 it's still cut off.
I've got a NavigationController in the app which is 44 pixels, not sure if that's screwing something up somehow.
I was checking the contentSize of the scrollView and contentView and before any zooming is done, the Height of my scrollView is 44 pixels bigger than the contentView, but after any zooming the ratio is 1:1 and that seems to be the problem.
I'm not changing the size anywhere in the code though.
Any help is appreciated!
Thanks
Like i thought before I added this piece of code
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale (float)scale
{
self.scrollView.contentSize = CGSizeMake(self.scrollView.contentSize.width, self.scrollView.contentSize.height + (44 * scale));
}
And now Zooming doesn't cut anything off and seems to be working correctly.
I still don't believe this is what I should have to do but I guess it works for now.
Still hoping someone has a better answer!
After playing more with my app I realized that the zooming was never the problem to begin with. The actual problem was with my UIView *contentView. After changing the background colour of my scrollView and my contentView (to 2 very diff colours) I noticed that my contentView wasn't long enough to cover all of the buttons.
So at first load the scrollView was big enough to see everything but once you zoom and it takes the size of the contentView it wasn't being adjusted properly!
All that to say, it finally works how it should!..haha no replies but hopefully someone might find this useful! Best tip was to change the background colours.
Good Day,
I realize very late to the game, but wanted to updated what i found on this, should anyone else come across this issue.
All did was set BOTH the UIImageView and the UIScrollView to "Aspect Fit" and this fixed the issue for me. This may be an Xcode 7 feature, but it works.