I am creating the UIImageView using interface Builder. Its frame size is (320,67).
I want to display the image on the imageView. I am getting the image from the web. The problem is that the image get from web is stretched to display on the imageview...
Here my code
NSData *imageData=[NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://www.isco.com/webproductimages/appBnr/bnr1.jpg"]];
imageView.image = [UIImage imageWithData:imageData];
Can anyone tel me that how to display the image fit to display on imageView????
Either use
imageView.contentMode = UIViewContentModeScaleAspectFill;
or
imageView.contentMode = UIViewContentModeScaleAspectFit;
The first one will fill the frame, possibly cutting off parts of your image. The second one will show the entire image, possibly leaving areas of the frame open.
For Swift :
imageView.contentMode = UIViewContentMode.ScaleAspectFit
For Objective-C :
imageView.contentMode = UIViewContentModeScaleAspectFit
ScaleAspectFit option is use to scale the content to fit the size of the view by maintaining the aspect ratio. Any remaining areas of the view’s bounds is transparent.
Refer Apple docs for details.
I ended up resizing the image after the image was scaled according to it's aspect ratio.
let widthRatio = ImageView.bounds.size.width / (captureImageView.image?.size.width)!
let heightRatio = ImageView.bounds.size.height / (captureImageView.image?.size.height)!
let scale = min(widthRatio, heightRatio)
let imageWidth = scale * (ImageView.image?.size.width)!
let imageHeight = scale * (ImageView.image?.size.height)!
ImageView.frame = CGRect(x: 0, y: 0, width: imageWidth, height: imageHeight)
Try this code.
imView.contentMode = UIViewContentModeScaleAspectFit;
Related
i've a PNG image that i would insert into my navigation title.
In Object C i've
UIImage *image = [UIImage imageNamed:#"logo_up.png"];
self.navigationItem.titleView = [[UIImageView alloc] initWithImage:image];
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
it works very well and my image was in high quality
Then i create a similar APP in swift, using the same image, and write this code
self.navigationItem.titleView = UIImageView(image: UIImage(named: "icons/logo_up.png"))
self.navigationController?.navigationBar.barTintColor = UIColor.whiteColor()
self.navigationController?.navigationBar.frame.size.width = 320
self.navigationController?.navigationBar.frame.size.height = 44
it print my image but with very poor quality.
I create different image with different size but nothing change. Every image in this APP have poor quality.
I use PNG and JPG extension.
Try to play with the content mode of your UIImageView. You are changing the frame of the UINavigationBar in your Swift example, the image can be reduced in quality by doing this.
let imageView = UIImageView(image: UIImage(named: "icons/logo_up.png"))
imageView.contentMode = .ScaleAspectFit //change contentMode
self.navigationItem.titleView = imageView
self.navigationController?.navigationBar.barTintColor = UIColor.whiteColor() self.navigationController?.navigationBar.frame.size.width = 320
self.navigationController?.navigationBar.frame.size.height = 44
I'm trying to display a top portion of an UIImage.
I know I can use the following code and display the middle portion. I'm just trying to figure out how to do the same for the top portion:
imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.clipsToBounds = YES;
The UIImage I get from the server is not necessarily the same size, so I cannot use UIViewContentModeTopLeft. I want a way to scale the image and show the top portion.
Thanks.
You want to display an arbitrary rectangle of your image, so the easiest way to go will to be to put your imageView inside a regular view. You can set the frame of the image view to display the bit you want and set the enclosing view to do the clipping.
e.g. you have a 1000 x 1000 px image and you want to display the rectangle 200,200 to 400,400
UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"SomeImage"]];
imageView.frame = CGRectMake( -200, -200, 1000, 1000);
UIView* enclosingView = [[UIView alloc] initWithFrame:CGRectMake( 0, 0, 200, 200);
enclosingView.clipsToBounds = YES;
[enclosingView addSubview: imageView];
Content mode doesn't matter much in this case, since you're setting the dimension of the image view to match the image.
One way is to call CGImageCreateWithImageInRect on your original image to create a new image with just the top portion.
Something like:
CGImageRef newImageRef = CGImageCreateWithImageInRect( oldImage.CGImage, CGRectMake(0,0,50,50) );
UIImage *newImage = [UIImage imageWithCGImage:newImageRef];
CGImageRelease( newImageRef );
then display newImage rather than oldImage.
I have my UIImageView and I put an image into it that I resize like this:
UIImageView *attachmentImageNew = [[UIImageView alloc] initWithFrame:CGRectMake(5.5, 6.5, 245, 134)];
attachmentImageNew.image = actualImage;
attachmentImageNew.backgroundColor = [UIColor redColor];
attachmentImageNew.contentMode = UIViewContentModeScaleAspectFit;
I tried getting the width of the resized picture in my UIImageView by doing this:
NSLog(#"Size of pic is %f", attachmentImageNew.image.size.width);
But it actually returns me the width of the original picture. Any ideas on how do I get the frame of the picture that I see on screen?
EDIT: Here's how my UIImageView looks, red area is its backgroundColor
I don't know is there more clear solution, but this works:
float widthRatio = imageView.bounds.size.width / imageView.image.size.width;
float heightRatio = imageView.bounds.size.height / imageView.image.size.height;
float scale = MIN(widthRatio, heightRatio);
float imageWidth = scale * imageView.image.size.width;
float imageHeight = scale * imageView.image.size.height;
A solution in Swift:
let currentHeight = imageView.bounds.size.height
let currentWidth = imageView.bounds.size.width
let newWidth = UIScreen.mainScreen().bounds.width
let newHeight = (newWidth * currentHeight) / currentWidth
println(newHeight)
It has the reference of your original image, so always gives the same dimensions as of original image.
To get the dimensions of new image you have to check aspect ratio. I have derived a formula for my need using different images of different size using Preview that how it resizes image according to its aspect ratio.
According to Apple's Documentation for UIViewContentModeScaleAspectFit
It Scales the content (In your case actualImage) to fit the size of the view (In your case attachmentImageNew) by maintaining the
aspect ratio.
That means your image size ( after the scaling ) should be same as your UIImageView.
UPDATE :
One new Suggestion to you if you don't want to use UIViewContentModeScaleAspectFit and if you can fix the size of scaledImage then you can use below code to scale the image for fix newSize and then you can use the width to your code.
CGSize newSize = CGSizeMake(100.0,50.0);
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
in your case:
float yourScaledImageWitdh = attachmentImageNew.frame.size.height * attachmentImageNew.image.size.width / attachmentImageNew.image.size.height
NSLog(#"width of resized pic is %f", yourScaledImageWitdh);
but you should also check, before, the original image proportion vs the imageView proportion, my line of code is good just in case the red area is added horizontally, not in case your original image proportion is wider than the imageView frame proportion
For Swift 2, you can use this code snippet to align an aspectFitted image to the bottom of the screen (sampled from earlier answers to this question -> thanks to you, guys)
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = CGFloat(screenSize.width)
let screenHeight = CGFloat(screenSize.height)
imageView.frame = CGRectMake(0, screenHeight - (imageView.image?.size.height)! , screenWidth, (imageView.image?.size.height)!)
let newSize:CGSize = getScaledSizeOfImage(imageView.image!, toSize: self.view.frame.size)
imageView.frame = CGRectMake(0, screenHeight - (newSize.height) , screenWidth, newSize.height)
func getScaledSizeOfImage(image: UIImage, toSize: CGSize) -> CGSize
{
let widthRatio = toSize.width/image.size.width
let heightRatio = toSize.height/image.size.height
let scale = min(widthRatio, heightRatio)
let imageWidth = scale*image.size.width
let imageHeight = scale*image.size.height
return CGSizeMake(imageWidth, imageHeight)
}
I have UIImageView in which I'm showing 50x100 image.
I want to show only a part of image 50x50 (top part)?
How can I do that?
The very simple way to move big image inside UIImageView as follows.
Let we have the image of size (100, 400) representing 4 states of some picture one below another. We want to show the 2nd picture having offsetY = 100 in square UIImageView of size (100, 100).
The solution is:
UIImageView *iView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
CGRect contentFrame = CGRectMake(0, 0.25, 1, 0.25);
iView.layer.contentsRect = contentFrame;
iView.image = [UIImage imageNamed:#"NAME"];
Here contentFrame is normalized frame relative to real UIImage size.
So, "0" means that we start visible part of image from left border,
"0.25" means that we have vertical offset 100,
"1" means that we want to show full width of the image,
and finally, "0.25" means that we want to show only 1/4 part of image in height.
Thus, in local image coordinates we show the following frame
CGRect visibleAbsoluteFrame = CGRectMake(0*100, 0.25*400, 1*100, 0.25*400)
or CGRectMake(0, 100, 100, 100);
You can crop the image by using CGImageCreateWithImageInRect, which is Quartz primitive working on CGImageRef, so you would have something like:
CGImageRef imageRef = CGImageCreateWithImageInRect(originalImage.CGImage, cropRect);
UIImage* outImage = [UIImage imageWithCGImage:imageRef scale:originalImage.scale orientation:originalImage.imageOrientation]];
CGImageRelease(imageRef);
When calculation cropRect, keep in mind that it should be given in pixels, not in points, i.e.:
float scale = originalImage.scale;
CGRect cropRect = CGRectMake(0, 0,
originalImage.size.width * scale, originalImage.size.height * 0.5 * scale);
where the 0.5 factor accounts for the fact that you want the top half only.
If you do not want to go low-level, you could add your image to a UIView as a background color and use the clipToBounds CALayer property to make the clipping:
myView.backgroundColor = [UIColor colorWithBackgroundPattern:myImage];
myView.layer.clipToBounds = YES;
also, set myView bounds accordingly.
I might have a solution for you. See if this works. In Interface Builder there is an option about Image content fill properties. You can set it to top-left. Follow the image in interface builder -
After this set the size of UIImageView to 50x50 with "clip-subviews" checked...
In the design of my app, I have a square space for an image that comes from a remote server. However, occasionally the image is a landscape rectangle instead of a square.
I don't want to crop the image, but instead scale it down far enough to fit inside the square constraints, then fill in the remaining space with some background color, white maybe.
Set the contentMode of your UIImageView to UIViewContentModeScaleAspectFit.
I don't know if this helps or not, but I use this to fit the size of the View to match the image. It takes the provided rect, and trims it to match the image. The returned CGRect can be then be applied to the view. I used this so I could add a shadow to the image (which looks wrong if the view doesn't match the image perfectly).
- (CGRect) resizeCGRect:(CGRect)rect toImage:(UIImage *)image{
CGSize size = rect.size;
CGSize iSize = image.size;
if (iSize.width > iSize.height){
if (iSize.width / iSize.height > size.width / size.height)
size.height = size.width * (iSize.height / iSize.width);
else
size.width = size.height * (iSize.width / iSize.height);
} else {
if (iSize.height / iSize.width > size.height / size.width)
size.width = size.height * (iSize.width / iSize.height);
else
size.height = size.width * (iSize.height / iSize.width);
}
rect.size = size;
return rect;
}
Create a UIImageView with a background color of the color you want. Create your image from your server, set the image in the image view, and then set the contentMode = UIViewContentModeScaleAspectFit
UIImageView *backgroundColorWhite = [[UIImageView alloc] initWithFrame:someObject.frame];
backgroundColorWhite.backgroundColor = [UIColor whiteColor];
UIImage *serverImage = [UIImage imageWithData:serverData];
backgroundColorWhite.contentMode = UIViewContentModeScaleAspectFit;
[backgroundColorWhite setImage:serverImage];