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];
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.
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.
how do you use UiimageView to show an image to make sure the imageview is the correct size of the UIImage? thanks!
This code should create an imageView with the frame of your image automatically.
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"ImageName"]];
A little background from the docs.
This method adjusts the frame of the receiver to match the size of the
specified image. It also disables user interactions for the image view
by default.
Is it possible to set an image over an other image,
respectively to overlay an image above an UIImage.
I give some code:
Headerfile:
#property (nonatomic,assign)UIImageView* imageView;
Implementationfile
UIImage *overlayImage = [UIImage imageNamed:#"lamp.png"];
The "imageView.image" has got an image and above that I will have this lamp, but later on it has to be possible to move it.
I searched some methods, but all methods gave me warnings.
Could you help me how to manage it? And is Core Animation an alternative to handle that?
Just add it as a subview. UIImageView is a UIView like any other.
UIImage *overlayImage = [UIImage imageNamed:#"lamp.png"];
UIImageView *overlayImageView = [[UIImageView alloc] initWithImage:overlayImage];
[self.imageView addSubview:overlayImageView];
You should use another UIImageView. A UIImage doesn't refer to an actual view in the interface, it's used as a reference to an image to be reused in code.
UIImageView* lampImageView= [[UIImageView alloc] initWithImage:overlayImage];
This way you can move it around anywhere over the first image view.
I was hoping there was some sort of function that could take the real size of my picture
CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0, 210.0f); // 234
UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:#"start.png"]];
And with CGRectMake which does something like this ..( imageViewHeight ,
CGFloat imageViewHeight = [myImage frame].size.height;
So that I could get the real size instead of having to define it like you can seen above.
I don't really get what you're asking, but here's a shot:
If you have a UIImage, and you want to know its size, you can ask it for its -[UIImage size] property.
However, if you want to create a UIImageView that's the same size as a UIImage, then you can just use -[UIImageView initWithImage:], which will automatically set the frame of the UIImageView to correspond to the dimensions of the image.
If, however, you're just looking to change the dimensions of a currently existing view, there's really no easy way to do that without messing around with the view's frame. You could maybe apply an affine transform to scale it, but it's easier to manipulate the frame.
It looks like you're asking to add the image to the imageview without first creating a frame. If this is the case, you can do the following:
UIImageView *myImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"start.png"]];
As far as I understood, you are looking for the size of the image used in UIImageView object. To do that, there is not a function built in UIImageView but you can do it this way:
NSString* image= [myImage image].accessibilityIdentifier; // Get the image's name
UIImage *img = [UIImage imageNamed:image]; // Create an image object with that name
CGSize size = img.size; // Get the size of image
Hope this helps your question.