iOS Cut a UIImage into a circle Cut a image into a circle - Objective C
Example
import #include <math.h>
The code in the viewDidLoad or loadView should look something look something like this
- (void)loadView
{
[super loadView];
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 50, 320, 320)];
[self.view addSubview:imageView];
UIImage *image=[UIImage imageNamed:@"Dubai-Photos-Images-Travel-Tourist-Images-Pictures-800x600.jpg"];
imageView.image=[self circularScaleAndCropImage:[UIImage imageNamed:@"Dubai-Photos-Images-Travel-Tourist-Images-Pictures-800x600.jpg"] frame:CGRectMake(0, 0, 320, 320)];
}
Finally the function which does the heavy lifting circularScaleAndCropImage is as defined below
- (UIImage*)circularScaleAndCropImage:(UIImage*)image frame:(CGRect)frame {
// This function returns a newImage, based on image, that has been:
// - scaled to fit in (CGRect) rect
// - and cropped within a circle of radius: rectWidth/2
//Create the bitmap graphics context
UIGraphicsBeginImageContextWithOptions(CGSizeMake(frame.size.width, frame.size.height), NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
//Get the width and heights
CGFloat imageWidth = image.size.width;
CGFloat imageHeight = image.size.height;
CGFloat rectWidth = frame.size.width;
CGFloat rectHeight = frame.size.height;
//Calculate the scale factor
CGFloat scaleFactorX = rectWidth/imageWidth;
CGFloat scaleFactorY = rectHeight/imageHeight;
//Calculate the centre of the circle
CGFloat imageCentreX = rectWidth/2;
CGFloat imageCentreY = rectHeight/2;
// Create and CLIP to a CIRCULAR Path
// (This could be replaced with any closed path if you want a different shaped clip)
CGFloat radius = rectWidth/2;
CGContextBeginPath (context);
CGContextAddArc (context, imageCentreX, imageCentreY, radius, 0, 2*M_PI, 0);
CGContextClosePath (context);
CGContextClip (context);
//Set the SCALE factor for the graphics context
//All future draw calls will be scaled by this factor
CGContextScaleCTM (context, scaleFactorX, scaleFactorY);
// Draw the IMAGE
CGRect myRect = CGRectMake(0, 0, imageWidth, imageHeight);
[image drawInRect:myRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
