I want to have a background image behind a UIScrollView area. That part's easy. The issue I'm running into is I don't want the image to move. I want it to fill the screen and then the scrolling just happens over that without effecting the image in anyway.
I've looked through lots of other postings on similar topics, but can't seem to get anything to work.
When I do the following, the background scrolls:
CGRect fullScreenRect = [[UIScreen mainScreen] applicationFrame];
UISCrollView *scrollView = [[UIScrollView alloc] initWithFrame:fullScreenRect];
scrollView.backgroundColor = [UIColor clearColor];
UIImageView *bkg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"img"]];
[scrollView addSubview:bkg];
Put the image in a UIImageView and place it behind the UIScrollView. Set the UIScrollView's color to 100% transparency ([UIColor clearColor]).
Related
Here's my code to get the screenshot of the view:
if (NULL != UIGraphicsBeginImageContextWithOptions){
UIGraphicsBeginImageContextWithOptions(pagedScrollView.frame.size, NO, [[UIScreen mainScreen] scale]);
}else{
UIGraphicsBeginImageContext(pagedScrollView.frame.size);
}
[pagedScrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
screenshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc] initWithImage:screenshotImage];
imageView.frame = CGRectMake(imageView.frame.origin.x, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
imageView.backgroundColor = [UIColor greenColor];
[self.view addSubview:imageView];
I'm 100% sure I have the right frame and the right view - the size of UIImageView say about it - but the thing is I can't get my UIImage to be displayed on the UIImageView.
The UIImageView is added on the view and I see a green region on it - but no image inside it, what can be wrong?
I'm using iOS 6 and ARC.
Well, I just tested your code running on my view controller's view and the capture and display worked fine. This leads me to believe that pagedScrollView is probably nil, or has a zero frame.
Either way, you'll be creating an image from a blank context and then passing it to your image view resulting in there not being any visible image.
It turns out I've been taking a screenshot of a long UIScrollView and I was always taking its first page - it had a lot of pages in it and sometimes the layer had nothing in it. It also turns out that UIImage was never released and the memory can effectively store dozens of them.
I have a couple of arcs and rects in a UIView, and a UIImageView as well. I want to have the UIImageView in the background. I have ordered it in IB so that the image view is behind my labels and buttons.
First, I need to put an image in the image view, which I don't want to do in IB. I've tried this code
UIImage *myImage = [UIImage imageNamed:#"image.png"];
UIImageView *myImageView = [[UIImageView alloc] initWithImage:#"myImage"];
But it doesn't work. After I get that working, what can I do to move my paths in front of the image view?
I think you want to draw to put a background image and on top of it want to draw circles(arcs).
If my understanding is correct. First draw the image on to the view using CGContextDrawImage() and then draw arcs on top of it. (No need to use image view).
Add image to UIImageView :
UIImage *myImage = [UIImage imageNamed:#"image.png"];
UIImageView *myImageView = [[UIImageView alloc] initWithImage:myImage];
[self.view addSubview:myImageView];
So I'm trying to load an image from camera into image view. I've got it done, but images aspect ratio changes.
I tried setting content mode for imageview but no effect.
Here is how i do it:
UIImage *picture=[UIImage imageWithData:slika];
imageview = UIViewContentModeScaleAspectFit;
[imageview setImage:picture forState:UIControlStateNormal];
Any ideas?
Is image view your own view? Or it's, for example, cell's default imageView?
And you should write so:
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.image = [UIImage imageNamed:picture];
or
[imageView setImage:picture];
There is no method [imageview setImage:picture forState:UIControlStateNormal]; for UIImageView, it only available for UIButton (and may be for some other UIControls, but UIImageView not subclass of UIControl - it direct subclass of UIView) . But button does not scale images preserving aspect ratio.
I've got an app that has two different background images. The one selected is determined by the orientation. When I start out, I check self.interfaceOrientation, and then go and pick the proper image. However, whenever the view opens, part of the image repeats instead of stretching. I saw a previous answer applying autoresizing masks to an imageview, but there is no imageview that I'm currently using.
Inside the loadView method:
if(self.interfaceOrientation==UIInterfaceOrientationPortrait ||self.interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)
{
[self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed: #"portrait"]]];
}else{
[self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed: #"landscape"]]];
}
As rishi had pointed out, the issue was caused by the colorWithPatternImage method. What I did to resolve this was to set the background of the view to be a specified image.
UIImageView* bgView = [[UIImageView alloc]initWithImage:[UIImage imageNamed: #"foo.png"]];
[self.view addSubview: bgView];
I also added in flexible width and height so that it would rotate properly.
I've customized background of navigation bar in my RootViewController (just part of code)
[navBar insertSubview:customBack atIndex:0];
I push detailViewController and add activity indicator as a rightBarButtonItem
UIActivityIndicatorView *actInd = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
actInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
self.activityIndicator = actInd;
[actInd release];
UIBarButtonItem * barButton = [[UIBarButtonItem alloc] initWithCustomView:self.activityIndicator];
[self.navigationItem setRightBarButtonItem:barButton];
[barButton release];
The problem is that the indicator is not visible but without customized background it works OK.
You can better change your navigationBar Background I think. Create a subclass of UINavigationBar and add:
- (void)drawRect:(CGRect)rect {
UIImage * image = [UIImage imageNamed:#"MyNavigationBarBackground.png"];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextScaleCTM(ctx, 1.0, -1.0); // Otherwise the image is drawn upside-down
CGContextDrawTiledImage(ctx, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage);
}
I do that and I never add a problem with any button :)
Zoleas has the right idea. If you don't or can't use a subclass, I think your problem is that you are adding your subview at index 0 so it is on top of the other views in the navigation bar, it is probably hiding your buttons.
set rightBarButtonItem with following way
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Exit" style:UIBarButtonItemStylePlain target:self action:#selector(cancel)];
Try this and also check the position of background
The activity indicator is there its just not being activated. Try animating it like this:
[actInd startAnimating];
Or if you want to keep it visible set the hideWhenStopped property like this:
actInd.hidesWhenStopped = NO;
Did you try to change the origin from the UIActivityIndicatorView?
Or creating it inside an UIView and add this UIView to the UIBarButtonItem.
I think the problem can be the frame from the element.
By this way you can resolve the problem:
Create activity indicator and add in a view1
Now this view1 add or create navigation bar with the help of this view1. Now when view1 is visible automatically you will be able to see the loading indicator.
Just wild try on this.