How to center UIImage and UILabel horizontally together? - iphone

I have an image for user's icon and a label for user's name
And I want the image and the label align center horizontally in the screen.
Because the length of the label changes as the length of user's name, (the size of image is fixed)
I can't set the positon as a fixed value.
Now I change the positon of the image and lalel at runtime,
It's not convenient.
Is there any good way to do this?
Thank you:)
Here is the snapshot:
All right.
I know there is no a very convenient way to do this just with IB.
And I learn the function of [label sizetoFit].
It's very helpful.
In android, it's very convenient to do this just with the xml layout.
But in ios I have to write code to control the positon of image and label.
Yes...Not too bad.
Thanks everybody :)

[label sizetoFit];
label.center =imageView.center;
this will make the label center on the image center..and it will appear on top...
now you can just use CGRect manipulation to move the label origin downwards based on your image height.
Edit .. now you can do this ..
CGRect frame = label.frame;
frame.origin.x -= imageview.frame.size.width/2 - 15; // you can change 15 to a more appropriate number based on your preference..
label.frame = frame;
Do the above after you do the 2 lines of code given on top in my answer.

Do some calculation
Width of UIImageView + Offset width (Space b/n UIImageView and UILabel "Keep this as constant value") + UILabel Width = You Will get some 'X' width.
iPhone screen width is 460.
320-X = Remaining width.
Remaining width/2 pass this value to UIImageView's X value. This might help you.

#define MARGIN 10.0f
In your -layoutSubviews method, do this:
[ label sizeToFit ] ;
CGRect r = label.frame ;
r.origin = (CGPoint){ CGRectGetMaxX( imageView.frame ) + MARGIN, CGRectGetMidY( imageView.frame ) - 0.5 * r.size.height } ;
label.frame = CGRectIntegral( r ) ;
update here's how to center the the image view and label unit
bounds should be set to bounds of enclosing view
//
// center an image view + label in parent view, with label to right of image view
//
[ label sizeToFit ] ;
CGSize size = (CGSize){ imageView.image.size.width + MARGIN + label.bounds.size.width,
MAX( imageView.image.size.height, label.bounds.size.height } ;
CGRect r = (CGRect){
{ CGRectGetMidX( bounds ) - 0.5 * size.width,
CGRectGetMidY( bounds ) - 0.5 * size.height },
size }
} ;
CGRect imageFrame, labelFrame ;
CGRectDivide( r, &imageFrame, &labelFrame, imageView.image.size.width, CGRectMinXEdge ) ;
imageView.frame = imageFrame ;
labelView.frame = labelFrame ;

Related

xcode UILabel resizing and repositioning not working

I have been trying to get this working for much longer than I care to admin, but I have searched just about every s.o article there is and none of the solutions seem to be doing anything...
My problem is that I am trying to resize a title (UILabel) based on the amount of text, after resizing the title I want to move the image 100 pixels below the title.
The image frame shows that the value has changed to what it has been calculated to be but there is never a change in the application, it only shows the design that was made in the storyboard.
Storyboard layout:
View
Scroll View
Image View
Label - TItle
The code below shows some printouts of values, without running it an example of those are:
Before: [0.000000]
After: [24.000000]
Label Expected Size: 280.000000, 96.000000
After Title Assign: [96.000000]
Image Y Before: [0.000000]
Image Y After: [196.000000]
Code:
self.Title.text = NewsCell.Title;
self.Image.image = NewsCell.Image;
// fit title
printf("Before: [%f]\n", self.Title.frame.size.height);
[self.Title sizeToFit];
printf("After: [%f]\n", self.Title.frame.size.height);
//self.Title.frame = CGRectMake(20, 5, 280, self.Title.frame.size.height);
self.Title.numberOfLines = 0;
CGSize maximumLabelSize = CGSizeMake(280, 100);
CGSize expectedLabelSize = [self.Title.text sizeWithFont:self.Title.font constrainedToSize:maximumLabelSize lineBreakMode:self.Title.lineBreakMode];
self.Title.frame = CGRectMake(20,0,expectedLabelSize.width, expectedLabelSize.height);
printf("Label Expected Size: %f, %f\n", expectedLabelSize.width, expectedLabelSize.height);
printf("After Title Assign: [%f]\n", self.Title.frame.size.height);
// set image location to be bototm of title + 100
printf("Image Y Before: [%f]\n", self.Image.frame.origin.y);
double titleBottom = self.Title.frame.origin.y + self.Title.frame.size.height + 100;
self.Image.frame = CGRectMake(0, titleBottom, 320, 200);
printf("Image Y After: [%f]\n", self.Image.frame.origin.y);
// set description location
double imageBottom = self.Image.frame.size.height + self.Image.frame.origin.y + 5;
// description expand
[self.Description.text stringByAppendingString: #"\n\n © 2013 Geekosystem, LLC"];
[self.Description sizeToFit];
self.Description.frame = CGRectMake(20, imageBottom, 280, self.Description.frame.size.height);
self.Description.numberOfLines = 0;

how to set image in top avoiding space in UIimageView

I've an UIImageView with content mode Aspect Fit of size 220x155. I'm dynamically inserting different images in different resolutions, but all larger than the size of the UIImageView. As the content mode is set to Aspect Fit, the image is scaled with respect to the ratio to fit the UIImageView.
My problem is, that if for instance the image inside the UIImageView is scaled to 220x100, I would like the UIImageView to shrink from a height of 155 to 100 too to avoid space between my elements.
How can I do this?
I wrote this method to get me the frame of the image view once it loaded an image.
So , the requirements for me were the same as in your case:
1) image view with aspect fit content mode
2) get the exact frame of the image ( this way you can re-position the image view )
Hope this helps:
- (CGRect) getFrameOfImage:(AsyncImageView *) imgView
{
if(!imgView.loaded)
return CGRectZero;
CGSize imgSize = imgView.image.size;
CGSize frameSize = imgView.frame.size;
CGRect resultFrame;
if(imgSize.width < frameSize.width && imgSize.height < frameSize.height)
{
resultFrame.size = imgSize;
}
else
{
float widthRatio = imgSize.width / frameSize.width;
float heightRatio = imgSize.height / frameSize.height;
float maxRatio = MAX (widthRatio , heightRatio);
NSLog(#"widthRatio = %.2f , heightRatio = %.2f , maxRatio = %.2f" , widthRatio , heightRatio , maxRatio);
resultFrame.size = CGSizeMake(imgSize.width / maxRatio, imgSize.height / maxRatio);
}
resultFrame.origin = CGPointMake(imgView.center.x - resultFrame.size.width/2 , imgView.center.y - resultFrame.size.height/2);
return resultFrame;
}
I am using here AsyncImageView but it will work just as good with UIImageView. The important thing to remember is to call this method AFTER the image was loaded.
Cheers!
Its very simple, you just need to get image actual size, which can be done by
UIImage *image = [UIImage imageName:#""];
then you just need to set frame
Like :-
imageView.frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
Hope this helps you.
Once the imageview's image is set to the new image (and thus scaled) you can get the height of the image inside the imageview (imageview.image.size.height) and set the imageview's height (frame) accordingly.

Calculating minimumZoomScale of a UIScrollView

I have an image that I want to load into an image view and set the minimumZoomScale, as well as the zoomScale to an aspectFill like scale that I calculate as follows:
// configure the map image scroll view
iImageSize = CGSizeMake(iImageView.bounds.size.width, iImageView.bounds.size.height);
iScrollView.minimumZoomScale = iScrollView.bounds.size.height / iImageSize.height;
iScrollView.maximumZoomScale = 2;
iScrollView.zoomScale = iScrollView.minimumZoomScale;
iScrollView.contentOffset = CGPointMake(0, 0);
iScrollView.clipsToBounds = YES;
The iScrollView size is 450 x 320px and the iImageSize is 1600 x 1960px.
Doing the minimumZoomScale math by hand: 450 / 1960 = 0.22959184.
The system determines 0.234693885 instead (???).
But to get the window fit into the 450px space, both figures don't work (!!!).
I manually tried and found 0.207 is the right number (that would translate to a image height of 2174 xp or alternatively a UIScrollView height of 406px).
For information: the UIScrollview screen is 450px, namely 480px minus status bar height (10), minus UITabBar height (20)
Any clues on this misbehaviour?
Not sure if you still have this problem, but for me, the scale is exactly the opposite. minimumZoomScale = 1 for me and I have to calculate the maximumZoomScale.
Here's the code:
[self.imageView setImage:image];
// Makes the content size the same size as the imageView size.
// Since the image size and the scroll view size should be the same, the scroll view shouldn't scroll, only bounce.
self.scrollView.contentSize = self.imageView.frame.size;
// despite what tutorials say, the scale actually goes from one (image sized to fit screen) to max (image at actual resolution)
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat minScale = 1;
// max is calculated by finding the max ratio factor of the image size to the scroll view size (which will change based on the device)
CGFloat scaleWidth = image.size.width / scrollViewFrame.size.width;
CGFloat scaleHeight = image.size.height / scrollViewFrame.size.height;
self.scrollView.maximumZoomScale = MAX(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
// ensure we are zoomed out fully
self.scrollView.zoomScale = minScale;
For simple zoom in/out i generally use below code. minimumZoomScale= 1 sets initial zoom to current image size. I have given maximumZoomScale = 10 which can be calculated from actual ratio of image size and container frame size.
[scrollView addSubview: iImageView];
scrollView.contentSize = iImageView.frame.size;
scrollView.minimumZoomScale = 1.0;
scrollView.maximumZoomScale = 10;
[iImageView setFrame:CGRectMake(0, 0, 450, 320)];
[scrollView scrollRectToVisible:iImageView.frame animated:YES];

Formula for producing a CGRect for a UIScrollView, that displays a UIImage in scaled to fit way

I am loading in images with varying sizes and putting them in UIScrollViews, all the images are larger than the UIScrollView.
The user can scroll and zoom as they please, but initially I would like for the image
to be centered and scaled so the largest side of the image aligns with the edge of the scrollView, i.e. if the picture is in landscape I would like to size and scale it so that the left and right side goes all the way to the edge of the UIScrollVIew and vice versa
I found a formula in a utility function in the Programming guide but it does not quite fit my needs.
My approach is to use:
CGrect initialPos = ?
[self.scrollView zoomToRect:initialPos animated:YES];
I know the size of my scrollView and the size of my image, what I need to figure out is the scale and CGRect to apply to the scrollView to center and size my image.
Hope someone can help out:) Thanks
Edit: previous version was sizing the image to the view rather than the other way around. I think this should correct that:
double imgRatio = imageSize.width / imageSize.height;
double viewRatio = viewSize.width / viewSize.height;
if ( imgRatio >= viewRatio )
{
initialPos.size.width = imageSize.width;
initialPos.size.height = imageSize.width / viewRatio;
initialPos.origin.x = 0;
initialPos.origin.y = (imageSize.height - initialPos.size.height) / 2;
}
else
{
initialPos.size.height = imageSize.height;
initialPos.size.width = imageSize.height * viewRatio;
initialPos.origin.y = 0;
initialPos.origin.x = (imageSize.width - initialPos.size.width) / 2;
}

iphone UitextView Text cut off

I have a Uitextview that is populated with a text file. I have a control on the page that allows the user to enable and disable paging. I am having a problem where the top and/or bottom line of the text is sometimes "split in half" so you can only see the top or bottom half of the line. I believe the code below should fix it. The code gets the line height of the text and the frame height, figures out the number of lines that are visible on the screen, and creates a new frame height so it will fit. While the frame does get resized, it still "cuts off" the top and/or bottom line. Anyone one have any suggestions? Is my math wrong?
Thanks!!!
- (void)fitText
{
CGFloat maximumLabelHeight = 338;
CGFloat minimumLabelHeight = 280;
CGSize lineSize = [theUiTextView.text sizeWithFont:theUiTextView.font];
CGFloat lineSizeHeight = lineSize.height;
CGFloat theNumberOfLinesThatShow = theUiTextView.frame.size.height/lineSize.height;
//adjust the label the the new height
theNumberOfLinesThatShow = round(theNumberOfLinesThatShow);
CGFloat theNewHeight = lineSizeHeight * theNumberOfLinesThatShow;
if (theNewHeight > maximumLabelHeight)
{
theNumberOfLinesThatShow = theNumberOfLinesThatShow - 1;
theNewHeight = lineSizeHeight * theNumberOfLinesThatShow;
}
if (theNewHeight < minimumLabelHeight)
{
theNumberOfLinesThatShow = theNumberOfLinesThatShow + 1;
theNewHeight = lineSizeHeight * theNumberOfLinesThatShow;
}
//adjust the label the the new height.
CGRect newFrame = theUiTextView.frame;
newFrame.size.height = theNewHeight;
theUiTextView.frame = newFrame;
}
UIScrollView (and UITextView is a UIScrollView) seems to use a fixed 8-pixel inset on both sides. This seems to be independent of alignment or font size.
So, I think what you're missing here is the fudge factor of 16.0 - see this question.