How is the size detected from an image and then use that size to create a UIImageView, perfectly fitting the image inside?
Just create the UIImageView like this:
UIImageView *aImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"yourImage.png"]];
So the ImageView has the size of the image. From the Documentation of UIImageView:
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.
I hope my answer helps you. :-D
Sandro
Here no need to set the frame size when we use the image in imageView
UIImageView *img = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"image.png"]];
ImageView will automatically takes the size of image.
Related
I added a uiview as a subview on a view controller programmatically (called contentView). I also added an image on that uiview programmatically. Every time I run the app on the iPad the image is stretched! How do I fix the image so that it fits the iPad screen but doesn't stretch the image? I know the drawInRect is what is stretching the image. So how do I fix that?
Here is my code:
UIGraphicsBeginImageContextWithOptions(self.contentView.bounds.size, self.contentView.opaque, 0.0);
[[UIImage imageNamed:#"menu image 2.JPG"] drawInRect:self.contentView.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[self.contentView addSubview:imageView];
UIImageView has a property called contentMode which determines how the image layout is handled in the view context. contentMode is of type UIViewContentMode.
The default value is UIViewContentModeScaleToFill which stretches the image without respecting the aspect ratio. I am assuming it is the changing aspect ratio that is causing the issue.
If you wish to scale the image, but keep the aspect ratio, you have two options:
UIViewContentModeScaleAspectFit: This will show the image scaled to fill the view, but not clip any contents (if the aspect ratio doesn't match view size, it will show either horizontal or vertical bands)
UIViewContentModeScaleAspectFill: This will scale the image to fill the view entirely, without any bands - this will result in content being clipped if the image ratio doesn't match the view ratio.
To set the contentMode on the image view in Objective-C, use the following syntax:
UIImage *image = [UIImage imageNamed:#"menu image 2.JPG"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
imageView.contentMode = UIViewContentModeScaleAspectFill;
...
You should not need to use the custom context drawing for this to work anymore (thanks to Losiowaty for asking me about this).
Change code as below
UIImage *image = [UIImage imageNamed:#"menu image 2.JPG"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
imageView.contentMode = UIViewContentModeScaleAspectFit;
[self.contentView addSubview:imageView];
I guess your self.contentView.bounds is not having the same aspect ratio as your menu image 2.JPG . For an experiment, please try looking at the menu image 2.JPG's resolution. For example if it is 300x150, it's aspect ratio is (300/150 = 2:1). Set your self.contentView.bounds to this aspect ratio and draw the image and check the results. It will not stretch.
Please add this Single Line of code in your project
yourImage .contentMode = UIViewContentModeScaleAspectFit;
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"MDSpreadViewCell.png"]];
imageView.contentMode = UIViewContentModeScaleToFill;
imageView.contentStretch = CGRectMake(2./imageView.frame.size.width, 2./imageView.frame.size.height, 1./imageView.frame.size.width, 1./imageView.frame.size.height);
What is the equivalent code for the contentStretch of the image?
Use a resizable image (resizableImageWithCapInsets:resizingMode:). In Xcode 5 you can use a sliced image (set up in the asset catalog) for even more power.
There is a layer equivalent of contentStretch (contentsCenter) but I don't think that's a good idea with an image view.
I have a small problem with a UIImageView, I try to place an image dynamically so I start like this
self.picture_view = UIImageView.alloc.initWithFrame (CGRectMake (0, 16,45, 46))
but I want to take my frame size of each image I passed him.
So I do like this.
picture_frame = picture_view.frame;
picture_frame.size = picture_view.size;
picture_view.frame = picture_frame;
but when I do this
NSLog (picture_frame.size.inspect)
it gives me 45, 46 for each image,
So how recovered the image size and frame overrider for me that shows the correct size
thank you in advance.
PS: I done well picture_view.image = UIImage.imageNamed (my_picture)
You are actually setting the ImageViews frame to the frame of itself. You need to be doing it based on the actual UIImage. You can do this automatically by initing the view with the image.
Ex.
UIImageView *pictureView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"whatever.png"]];
//The size is already set correctly, but if you want to change the x or y origin do like so
pictureView.frame = CGRectMake(0, 16, pictureView.frame.size.width, pictureView.frame.size.height);
Edit: This answer is written in Objective-C, but the core idea should translate to rubymotion very easily.
If you are trying to create a UIImageView and then resize it to fit the UIImage you assign to it, you should try something like this:
Create an imageView with an image:
UIImage *image = [UIImage imageNamed:#"myPicture.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
Change the image, and resize the imageView to fit:
UIImage *anotherImage = [UIImage imageNamed:#"anotherPicture.png"];
imageView.image = anotherImage;
CGRect imageViewFrame = imageView.frame;
imageViewFrame.size = anotherImage.size;
imageView.frame = imageViewFrame;
I set the image of a UIImageView to an image that is 1024x1024, and as a result a lot of the image is not visible, especially width wise, and cut off the edges of the screen.
I tried using clipsToBounds:
UIImageView *imageFromLink = [[UIImageView alloc] initWithImage:responseObject];
imageFromLink.clipsToBounds = YES;
[darkOverlayView addSubview:imageFromLink];
But it doesn't seem to do anything, and the image is still too big for the view.
You're going to want to change the contentMode property for the desired effect. UIViewContentModeScaleAspectFill is most likely what you'll want.
You have the set the image view's frame to the size you want. By default it will be the size of the image.
UIImageView *imageFromLink = [[UIImageView alloc] initWithImage:responseObject];
imageFromLink.contentMode = UIViewContentModeScaleAspectFit;
imageFromLink.frame = CGRectMake(0, 0, desiredWidth, desiredHeight);
[darkOverlayView addSubview:imageFromLink];
Also set the contentMode so the image is scaled properly in the smaller image view.
You should set the imageview's frame equal to the container's bounds.
UIImageView *imageFromLink = [[UIImageView alloc]initWithImage:responseObject];
imageFromLink.contentMode = UIViewContentModeScaleAspectFit;
imageFromLink.frame = darkOverlayView.bounds;
[darkOverlayView addSubview:imageFromLink];
When i try to add image in imageView, it might be got stretch. My imageView size is fixed.
So, i add like as follow:
[imgView setContentMode:UIViewContentModeScaleAspectFit];
But if the image is sometimes cut off, small. So, image view got blank view above the image if image is small.
How can I take image as per image view without pixelated or stretch??
try [[yourimageview layer] setmasktobounds:yes];
UIViewContentModeCenter
Centers the content in the view’s bounds, keeping the proportions the
same.
UIViewContentModeScaleAspectFill
Just Check For maximum size of image and if its small then adjust size of imageview according to image.
here image is UIImage which is actually image to set on UIImageView
if(img.size.width < imgView.superview.frame.size.width ||
img.size.height < imgView.superview.frame.size.height)
{
[imgView setFrame:CGRectMake(0,0,img.size.width,img.size.height)];
[imgView setCenter:imgView.superview.center];
}
[imgView setContentMode:UIViewContentModeScaleAspectFit];