My problem is as follows:
I have on top of a UIImageView some labels. The image is a formular and the UILabels represents the entries.
If I rotate the device the image inside UIImageView gets resized with option "aspect fit".
How can I achieve that the UILabel is also resized and aligned correct?
The normal options for resizing aren't working as needed.
The UIImageView is zoomable with minimumZoomScale and maximumZoomScale set.
Thanks.
You can resize a UILabel proportionally using:
label.transform = CGAffineTransformMakeScale(0.5, 0.5);
You can reposition a UILabel relatively using:
label.frame = CGRectOffset(label.frame, deltaX, deltaY);
The rest is maths =)
So I managed to solve your problem. Full source code here.
Basically I removed your UIImageView and replaced it with a UIView. Then I added your UILabels within the UIView and removed any autosizing from the UIView and UILabels in interface builder. That way when the UIView gets resized any content in it will get resized/repositioned as well.
The next step was to change the class of the UIView to UIImageView in interface builder. Now from the source code I could set an image to it using imgView.image = [UIImage imageNamed:#"imagename.png"]; as well as I could set the mode using imgView.contentMode = UIViewContentModeScaleAspectFit;.
The transformation at rotation now happens with:
if (UIDeviceOrientationIsLandscape(deviceOrientation)){
// Play with the scale if you have any other images with different ratio.
float scale = 2.3f/3.0f;
// Transforming the UIImageView containing the UILabels which actually is a simple UIView
imgView.transform = CGAffineTransformMakeScale(scale, scale);
} else {
// Original size again
imgView.transform = CGAffineTransformMakeScale(1, 1);
}
Related
I have a probably simple mistake that drives me crazy.
I'm working with UIImageView within a UIScrollView. To fit the image in the view I want to get the width of the imageView to adjust the zoom scale.
But the code
imageView.bounds.width
always returns 240.0 no matter what size the actual image has.
In the Interface Builder the imageView is horizontally and verically centered in the view, clip subviews is true and Mode is aspect fit.
Any ideas?
The size of the UIImageView is not related to the size of the image it contains. The UIImageView is probably sized to 240.0 in the storyboard or wherever else you generate it. The image will scale down or up to fit the view based on the mode. To get the size of the actual image, try the following code:
let image = UIImage("my_image_file")
let imageHeight = image.size.height
let imageWidth = image.size.width
With the size of the image now know, you can set the size of the view appropriately.
I had the same problem. Now I check the bounds in the main_queue and everything works fine.
dispatch_async(dispatch_get_main_queue(), {
print(self.image.bounds.width)
})
I am using the UIImageView in my xib. App is designed for multi device without auto layout. It means I am using autoresizing.What I want to do is, only my UIImageView should autoresize not my Image inside the UIImageView, but unfortunately my image also getting stretched with UIImageView. I have tried the different ways but could not get success. Changed the content mode also but didn't work for me.
Try this...
//set content mode
self.imageView.contentMode = UIViewContentModeScaleAspectFit;
//clear background color
self.imageView.backgroundColor=[UIColor clearColor];
UIViewContentMode
UIViewContentModeScaleToFill,
UIViewContentModeScaleAspectFit, // contents scaled to fit with fixed aspect. remainder is transparent
UIViewContentModeScaleAspectFill, // contents scaled to fill with fixed aspect. some portion of content may be clipped.
UIViewContentModeRedraw, // redraw on bounds change (calls -setNeedsDisplay)
UIViewContentModeCenter, // contents remain same size. positioned adjusted.
UIViewContentModeTop,
UIViewContentModeBottom,
UIViewContentModeLeft,
UIViewContentModeRight,
UIViewContentModeTopLeft,
UIViewContentModeTopRight,
UIViewContentModeBottomLeft,
UIViewContentModeBottomRight,
Don't add the UIImage to the UIImageView whose size is going to change. Add it to another UIImageView and make this second UIImageView a subview of the first UIImageView.
UIImage *exampleImage = [UIImage imageWithContentsOfFile:filePath];
UIImageView *variableImageView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
CGFloat imageX = (variableImageView.bounds.size.width - exampleImage.size.width) / 2;
CGFLoat imageY = (variableImageView.bounds.size.height - exampleImage.size.height) / 2;
UIImageView *helperImageView = [[UIImageView alloc] initWithFrame:CGRectMake(imageX, imageY, exampleImage.size.width, exampleImage.size.height)];
helperImageView.image = exampleImage;
helperImageView.contentMode = UIViewContentModeScaleAspectFit;
[self.view addSubview:variableImageView];
[variableImageView addSubview:helperImageView];
I hope this helps.
I have a view where I need to place an UIImageView, and I was told to place it inside a rectangle that takes the screen width and its height is smaller than width (fixed size). However, the images I've been given are more or less square jpeg images, so the idea is to fill the width of the rectangle that should contain the image and set the height of the image in a way that its aspect ratio is kept. Then, I should be able to let the user scroll the image vertically to see the complete image.
How could I do this?
Thanks in advance
EDIT: I need to do this for several images that have different sizes, but that should fit the same rectangular area size within the view
You can set imageview content mode.
imageView.contentMode = UIViewContentModeScaleAspectFit;
This will make sure that the image is displayed by keeping original aspect ratio.
Edit:
I think this is what you wanted:
UIImage *originalImage = [UIImage imageNamed:[picArr objectAtIndex:a]];
double width = originalImage.size.width;
double height = originalImage.size.height;
double apect = width/height;
double nHeight = 320.f/ apect;
self.img.frame = CGRectMake(0, 0, 320, nHeight);
self.img.center = self.view.center;
self.img.image = originalImage;
Hope this helps.. :)
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];
I have an UIView that contains a UIImageView. The UIImageViews works like the branding logo of the app. When I rotate the device, the containing UIView resizes itself to correspond to the landscape or portrait proportions of the screen.
What I'm trying to achieve is to have the UIImageView scaled accordingly, keeping proportions also on the left margin.
This is the actual code for the top white "banner":
UIView *topBanner = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, height_topBanner)];
[topBanner setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleBottomMargin)];
[topBanner setBackgroundColor:[UIColor whiteColor]];
topBanner.autoresizesSubviews = YES;
// the logo
UIImage *topBanner_logo = [UIImage imageNamed:#"logo.png"];
float logoAspectRatio = topBanner_logo.size.width/topBanner_logo.size.height;
topBanner_logoView = [[UIImageView alloc] initWithFrame:CGRectMake(topBanner.frame.size.width/100*3, topBanner.frame.size.height/100*7, (topBanner.frame.size.height/100*86)*logoAspectRatio, topBanner.frame.size.height/100*86)];
[topBanner_logoView setImage:topBanner_logo];
topBanner_logoView.backgroundColor = [UIColor blueColor];
topBanner_logoView.contentMode = UIViewContentModeScaleAspectFit;
[topBanner_logoView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleRightMargin)];
[topBanner addSubview:topBanner_logoView];
[self.view addSubview:topBanner];
This is my starting point: portrait iPad on startup:
This is what happens when I rotate it in landscape:
As you can see, the proportions of the UIImage are ok, but I'm getting extra borders (I set the background color of the UIImageView to highlight it) because the UIImageView stretches itself to follow the change of the size of its container, and the UIImage is fit into the UIImageView and put on its center.
The same - reversed - happens when I start the app directly in landscape mode:
Then I rotate it:
... and I get the logo with extra borders on top and bottom.
I do see that I can write a function to recalculate every size on each rotation change, but I'm asking to myself if is there a way to set the UIImageView and the UIImage to make it works without hacking the autorotate/resize procedures of iOS. It sounds so simple!
You can solve this by not using UIViewContentModeScaleAspectFit, and instead calculating the aspect ratio of the image and using that to explicitly the width or height based on the other (width or height).
e.g. I rotate to landscape, and so I want the height to be 80% of the view.
CGFloat w = logo.image.size.width;
CGFloat h = logo.image.size.height;
CGFloat a = w / h;
CGFloat h_use = self.view.height *0.8;
CGFloat w_use = h_use*a;
Furthermore, set the content mode to UIViewContentModeScaleAspectFill instead now that you've explicitly set the aspect ratio.
You have set the auto resizing mask to flexible height and width:
[topBanner_logoView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleRightMargin)];
If you do not do that, the default is that the view will not chance size, and therefore, the image will not either.
I think it is because of topBanner_logoView.contentMode = UIViewContentModeScaleAspectFit;
Try topBanner_logoView.contentMode = UIViewContentModeCenter or topBanner_logoView.contentMode = UIViewContentModeLeft to prevent the UIImageView's image from resizing (and getting padding).
If the UIImageView is resizing, remove the autoresizing mask.