How to Resize image in Swift?
See my blog post, Resize image in swift and objective C, for further details.
Image resize function in swift as below.
func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage? {
let size = image.size
let widthRatio = targetSize.width / size.width
let heightRatio = targetSize.height / size.height
// Figure out what our orientation is, and use that to form the rectangle
var newSize: CGSize
if(widthRatio > heightRatio) {
newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
} else {
newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
}
// This is the rect that we've calculated out and this is what is actually used below
let rect = CGRect(origin: .zero, size: newSize)
// Actually do the resizing to the rect using the ImageContext stuff
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}
Use the above function and resize image with 200*200 as below code
self.resizeImage(UIImage(named: "yourImageName")!, targetSize: CGSizeMake(200.0, 200.0))
swift3 updated
func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage {
let size = image.size
let widthRatio = targetSize.width / size.width
let heightRatio = targetSize.height / size.height
// Figure out what our orientation is, and use that to form the rectangle
var newSize: CGSize
if(widthRatio > heightRatio) {
newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
} else {
newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
}
// This is the rect that we've calculated out and this is what is actually used below
let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
// Actually do the resizing to the rect using the ImageContext stuff
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
Resizing Image in Xcode?
The simple answer would be "NO".
I do not aware of any way to use Xcode resizing images.
The easiest method for me is to right click on any image and select "Open with External Editor". Preview should be opened and the app is quite simple to use.
The simplest way to resize an UIImage?
The simplest way is to set the frame of your UIImageView
and set the contentMode
to one of the resizing options.
Or you can use this utility method, if you actually need to resize an image:
+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
//UIGraphicsBeginImageContext(newSize);
// In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
// Pass 1.0 to force exact pixel size.
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Example usage:
#import "MYUtil.h"
…
UIImage *myIcon = [MYUtil imageWithImage:myUIImageInstance scaledToSize:CGSizeMake(20, 20)];
How to resize Image with SwiftUI?
You should use .resizable()
before applying any size modifications on an Image
.
Image(room.thumbnailImage)
.resizable()
.frame(width: 32.0, height: 32.0)
Resize UIImage to 200x200pt/px
Here is my code. The Image is in width 850 px and not 200 px:
func resizeImage(image: UIImage, newWidth: CGFloat) -> UIImage {
let scale = newWidth / image.size.width
let newHeight = image.size.height * scale
UIGraphicsBeginImageContext(CGSizeMake(newWidth, newHeight))
image.drawInRect(CGRectMake(0, 0, newWidth, newHeight))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}
@IBAction func chooseImage(sender: AnyObject) {
var myPickerController = UIImagePickerController()
myPickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
myPickerController.delegate = self;
self.presentViewController(myPickerController, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
{
var imagenow = info[UIImagePickerControllerOriginalImage] as? UIImage
imageImage.image = resizeImage(imagenow!, newWidth: 200)
pimg2 = imageImage.image!
cidnew2 = textFieldCID!.text!
pname2 = textFieldName!.text
pmanu2 = textFieldMan!.text
pnick2 = textFieldNick!.text
podate2 = textFieldPODate!.text
pno2 = textFieldArtNo!.text
self.dismissViewControllerAnimated(true, completion: nil)
}
How to resize an image in iOS?
Try to implement the code below. It may be helpful for you:
CGRect rect = CGRectMake(0,0,75,75);
UIGraphicsBeginImageContext( rect.size );
[yourCurrentOriginalImage drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
How to easily resize/optimize an image size with iOS?
A couple of suggestions are provided as answers to this question. I had suggested the technique described in this post, with the relevant code:
+ (UIImage*)imageWithImage:(UIImage*)image
scaledToSize:(CGSize)newSize;
{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
As far as storage of the image, the fastest image format to use with the iPhone is PNG, because it has optimizations for that format. However, if you want to store these images as JPEGs, you can take your UIImage and do the following:
NSData *dataForJPEGFile = UIImageJPEGRepresentation(theImage, 0.6);
This creates an NSData instance containing the raw bytes for a JPEG image at a 60% quality setting. The contents of that NSData instance can then be written to disk or cached in memory.
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