I use a small image size, such are 26*27, 15*28,... but the image is stretched and how to avoid and to set all image alignment are center.
You can set your image to center of image using UIViewContentModeCenter
Using code
imageView.contentMode=UIViewContentModeCenter;
using Nib
Use following method for to specify the height and width of image
+ (UIImage*)resizeImage:(UIImage*)image withWidth:(int)width withHeight:(int)height
{
CGSize newSize = CGSizeMake(width, height);
float widthRatio = newSize.width/image.size.width;
float heightRatio = newSize.height/image.size.height;
if(widthRatio > heightRatio)
{
newSize=CGSizeMake(image.size.width*heightRatio,image.size.height*heightRatio);
}
else
{
newSize=CGSizeMake(image.size.width*widthRatio,image.size.height*widthRatio);
}
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
This method return NewImage, with a specific size that you specify
i think u want :
imageView.contentMode = UIViewContentModeScaleAspectFill;
Related
In my application i have used and image view to display images getting from database
in data base images are having different sizes,
for now i added image view with frame (10, 10, 300, 220).
I need to resize the frames of image view as per image size, just like Aspect Fit.
I know Aspect fit can able to resize but it do in changing width as per height ratio,
But i need to increase the height as per width ratio
i need to have width always 300, fixed but need to changes in height
For ex :
if image size is 500x1000 i need to resize imageview as 300x600
if image size is 400x600 i need to resize imageview as 300x450
You can use the following code snippet which will meets your requirements
-(UIImage *)adjustImageSizeWhenCropping:(UIImage *)image
{
float actualHeight = image.size.height;
float actualWidth = image.size.width;
float ratio=300/actualWidth;
actualHeight = actualHeight*ratio;
CGRect rect = CGRectMake(0.0, 0.0, 300, actualHeight);
// UIGraphicsBeginImageContext(rect.size);
UIGraphicsBeginImageContextWithOptions(rect.size, NO, 1.0);
[image drawInRect:rect];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
resizedImage = [self imageWithImage:originalImage scaledToSize:CGSizeMake(45,45)];
self.imageView.image = resizedImage;
- (UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
{
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Code snippet
self.newsImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,300,130)];
//set placeholder image or cell won't update when image is loaded
self.newsImage.image = [UIImage imageNamed:#"newsDetail.png"];
//load the image
self.newsImage.imageURL = [NSURL URLWithString:imageBig];
[imageBack addSubview:self.newsImage];
I have one image on 40*40 size but image view size 300*130. How to avoid stretching image.
I want center of the UIImageview.
Thanks in Advance !!!!
Just center the content:
self.newsImage.contentMode = UIViewContentModeCenter;
ou have to set CGSize as your image width and hight so image will not stretch and it arrange at the middle.
- (UIImage )imageWithImage:(UIImage )image scaledToFillSize:(CGSize)size
{
CGFloat scale = MAX(size.width/image.size.width, size.height/image.size.height);
CGFloat width = image.size.width * scale;
CGFloat height = image.size.height * scale;
CGRect imageRect = CGRectMake((size.width - width)/2.0f,
(size.height - height)/2.0f,
width,
height);
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
[image drawInRect:imageRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
I am resizing a image to fit it in a bar. I need to resize it because the image is in a db and this is use for the same app in android too. the thing is this code is working well in iOS 6.1 but in lower 5.0 5.1 I am having a black image in the bar. The code is the following:
CGSize newSize=CGSizeMake(320,44);
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.navigationController.navigationBar setBackgroundImage:newImage forBarMetrics:UIBarMetricsDefault];
some ideas of this wrong behavior?
Thanks
Use following method for specific hight and width with image
+ (UIImage*)resizeImage:(UIImage*)image withWidth:(int)width withHeight:(int)height
{
CGSize newSize = CGSizeMake(width, height);
float widthRatio = newSize.width/image.size.width;
float heightRatio = newSize.height/image.size.height;
if(widthRatio > heightRatio)
{
newSize=CGSizeMake(image.size.width*heightRatio,image.size.height*heightRatio);
}
else
{
newSize=CGSizeMake(image.size.width*widthRatio,image.size.height*widthRatio);
}
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
This method return NewImage, with specific size that you specify :)
This code may be helpful for you:)
I have this UIImageView and I have the values of its max height and max width. What I want to achieve is that I want to take the image (with any aspect ratio and any resolution) and I want it to fit in the borders, so the picture does not exceed them, but it can shrink them as it wants. (marked red in the picture):
Right now the image fits the necessary size properly, but I have 2 worries:
1. The UIImageView is not equal the size of the resized image, thus leaving red background (and I don't want that)
2. If the image is smaller that the height of my UIImageView it is not resized to be smaller, it stays the same height.
Here's my code and I know its wrong:
UIImage *actualImage = [attachmentsArray lastObject];
UIImageView *attachmentImageNew = [[UIImageView alloc] initWithFrame:CGRectMake(5.5, 6.5, 245, 134)];
attachmentImageNew.image = actualImage;
attachmentImageNew.backgroundColor = [UIColor redColor];
attachmentImageNew.contentMode = UIViewContentModeScaleAspectFit;
So how do I dynamically change the size not only of the UIImageView.image, but of the whole UIImageView, thus making its size totally adjustable to its content. Any help would be much appreciated, thanks!
When you get the width and height of a resized image Get width of a resized image after UIViewContentModeScaleAspectFit, you can resize your imageView:
imageView.frame = CGRectMake(0, 0, resizedWidth, resizedHeight);
imageView.center = imageView.superview.center;
I haven't checked if it works, but I think all should be OK
- (UIImage *)image:(UIImage*)originalImage scaledToSize:(CGSize)size
{
//avoid redundant drawing
if (CGSizeEqualToSize(originalImage.size, size))
{
return originalImage;
}
//create drawing context
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
//draw
[originalImage drawInRect:CGRectMake(0.0f, 0.0f, size.width, size.height)];
//capture resultant image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//return image
return image;
}
This is the Swift equivalent for Rajneesh071's answer, using extensions
UIImage {
func scaleToSize(aSize :CGSize) -> UIImage {
if (CGSizeEqualToSize(self.size, aSize)) {
return self
}
UIGraphicsBeginImageContextWithOptions(aSize, false, 0.0)
self.drawInRect(CGRectMake(0.0, 0.0, aSize.width, aSize.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
Usage:
let image = UIImage(named: "Icon")
item.icon = image?.scaleToSize(CGSize(width: 30.0, height: 30.0))
Use the category below and then apply border from Quartz into your image:
[yourimage.layer setBorderColor:[[UIColor whiteColor] CGColor]];
[yourimage.layer setBorderWidth:2];
The category:
UIImage+AutoScaleResize.h
#import <Foundation/Foundation.h>
#interface UIImage (AutoScaleResize)
- (UIImage *)imageByScalingAndCroppingForSize:(CGSize)targetSize;
#end
UIImage+AutoScaleResize.m
#import "UIImage+AutoScaleResize.h"
#implementation UIImage (AutoScaleResize)
- (UIImage *)imageByScalingAndCroppingForSize:(CGSize)targetSize
{
UIImage *sourceImage = self;
UIImage *newImage = nil;
CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;
CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;
CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;
CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
if (CGSizeEqualToSize(imageSize, targetSize) == NO)
{
CGFloat widthFactor = targetWidth / width;
CGFloat heightFactor = targetHeight / height;
if (widthFactor > heightFactor)
{
scaleFactor = widthFactor; // scale to fit height
}
else
{
scaleFactor = heightFactor; // scale to fit width
}
scaledWidth = width * scaleFactor;
scaledHeight = height * scaleFactor;
// center the image
if (widthFactor > heightFactor)
{
thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
}
else
{
if (widthFactor < heightFactor)
{
thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
}
}
}
UIGraphicsBeginImageContext(targetSize); // this will crop
CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width = scaledWidth;
thumbnailRect.size.height = scaledHeight;
[sourceImage drawInRect:thumbnailRect];
newImage = UIGraphicsGetImageFromCurrentImageContext();
if(newImage == nil)
{
NSLog(#"could not scale image");
}
//pop the context to get back to the default
UIGraphicsEndImageContext();
return newImage;
}
#end
If you have the size of the image, why don't you set the frame.size of the image view to be of this size?
EDIT----
Ok, so seeing your comment I propose this:
UIImageView *imageView;
//so let's say you're image view size is set to the maximum size you want
CGFloat maxWidth = imageView.frame.size.width;
CGFloat maxHeight = imageView.frame.size.height;
CGFloat viewRatio = maxWidth / maxHeight;
CGFloat imageRatio = image.size.height / image.size.width;
if (imageRatio > viewRatio) {
CGFloat imageViewHeight = round(maxWidth * imageRatio);
imageView.frame = CGRectMake(0, ceil((self.bounds.size.height - imageViewHeight) / 2.f), maxWidth, imageViewHeight);
}
else if (imageRatio < viewRatio) {
CGFloat imageViewWidth = roundf(maxHeight / imageRatio);
imageView.frame = CGRectMake(ceil((maxWidth - imageViewWidth) / 2.f), 0, imageViewWidth, maxHeight);
} else {
//your image view is already at the good size
}
This code will resize your image view to its image ratio, and also position the image view to the same centre as your "default" position.
PS: I hope you're setting imageView.layer.shouldRasterise = YES
and imageView.layer.rasterizationScale = [UIScreen mainScreen].scale;
if you're using CALayer shadow effect ;) It will greatly improve the performance of your UI.
I think what you want is a different content mode. Try using UIViewContentModeScaleToFill. This will scale the content to fit the size of ur UIImageView by changing the aspect ratio of the content if necessary.
Have a look to the content mode section on the official doc to get a better idea of the different content mode available (it is illustrated with images).
if([[SDWebImageManager sharedManager] diskImageExistsForURL:[NSURL URLWithString:#"URL STRING1"]])
{
NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:[NSURL URLWithString:#"URL STRING1"]];
UIImage *tempImage=[self imageWithImage:[[SDImageCache sharedImageCache] imageFromDiskCacheForKey:key] scaledToWidth:cell.imgview.bounds.size.width];
cell.imgview.image=tempImage;
}
else
{
[cell.imgview sd_setImageWithURL:[NSURL URLWithString:#"URL STRING1"] placeholderImage:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL)
{
UIImage *tempImage=[self imageWithImage:image scaledToWidth:cell.imgview.bounds.size.width];
cell.imgview.image=tempImage;
// [tableView beginUpdates];
// [tableView endUpdates];
}];
}
I'm trying to get the image.size.h and image.size.w of the UIImage inside of an UIImageView with UIViewContentModeScaleAspectFit on.
I want the resized UIImage size, not the original image size.
Is it possible to get this value?
CGSize size=CGSizeMake(79, 84);//set the width and height
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
//here is the scaled image which has been changed to the size specified
UIGraphicsEndImageContext();
This works for sure and don't forget to import QuartzCore FrameWork..
Have a Happy Coding (^_^)....
You can try calculate it by yourself:
//Your image
UIImage *image;
//Your imageView;
UIImageView *imageView;
int width, height;
float aspectRatio;
if (image.size.height > image.size.width)
{
height = imageView.frame.size.height;
aspectRatio = image.size.height / height;
width = image.size.width / aspectRatio;
}
else
{
width = imageView.frame.size.width;
aspectRatio = image.size.width / width;
height = image.size.height / aspectRatio;
}