Image Cropping API for iOS

Question

Is there any cropping image API for objective C that crops images dynamically in Xcode project? Please provide some tricks or techniques how could I crop camera images in iP

Answer 1

You can use CoreGraphics framework to cropping image dynamically. Here is a example code part of dynamic image crop. I hope this will be helpful for you.

- (void)drawMaskLineSegmentTo:(CGPoint)ptTo withMaskWidth:(CGFloat)maskWidth inContext:(NXMaskDrawContext)context{     
       if (context == nil)         
            return;     
       if (context.count <= 0){
            [context addObject:[NSValue valueWithCGPoint:ptTo]];
            return;
       }          
       CGPoint ptFrom = [context.lastObject CGPointValue];             
       UIGraphicsBeginImageContext(self.maskImage.size);
       [self.maskImage drawInRect:CGRectMake(0, 0, self.maskImage.size.width, self.maskImage.size.height)];     
       CGContextRef graphicsContext = UIGraphicsGetCurrentContext();        
       CGContextSetBlendMode(graphicsContext, kCGBlendModeCopy);     
       CGContextSetRGBStrokeColor(graphicsContext, 1, 1, 1, 1);     
       CGContextSetLineWidth(graphicsContext, maskWidth);            
       CGContextSetLineCap(graphicsContext, kCGLineCapRound);     
       CGContextMoveToPoint(graphicsContext, ptFrom.x, ptFrom.y);     
       CGContextAddLineToPoint(graphicsContext, ptTo.x, ptTo.y);     
       CGContextStrokePath(graphicsContext);
       self.maskImage = UIGraphicsGetImageFromCurrentImageContext();     
       UIGraphicsEndImageContext();          

       UIGraphicsBeginImageContext(self.displayableMaskImage.size);     
       [self.displayableMaskImage drawInRect:CGRectMake(0, 0, self.displayableMaskImage.size.width, self.displayableMaskImage.size.height)];     
       graphicsContext = UIGraphicsGetCurrentContext();     
       CGContextSetBlendMode(graphicsContext, kCGBlendModeCopy);     
       CGContextSetStrokeColorWithColor(graphicsContext, self.displayableMaskColor.CGColor);     
       CGContextSetLineWidth(graphicsContext, maskWidth);     
       CGContextSetLineCap(graphicsContext, kCGLineCapRound);     
       CGContextMoveToPoint(graphicsContext, ptFrom.x, ptFrom.y);     
       CGContextAddLineToPoint(graphicsContext, ptTo.x, ptTo.y);     
       CGContextStrokePath(graphicsContext);
       self.displayableMaskImage = UIGraphicsGetImageFromCurrentImageContext();     
       UIGraphicsEndImageContext();          
       [context addObject:[NSValue valueWithCGPoint:ptTo]]; 
}