Extension for UIImage to set a dotted pattern as image source

UIImageView+DottableExtension.m

@interface UIImageView (DottableImage)

- (void) dottedPatternFrom:(CGPoint)fromPoint to:(CGPoint)toPoint forWidth:(CGFloat)width;

@end


@implementation UIImageView (DottableImage)

float const DefaultDottedImageWidth = 5.0f;

- (void) dottedPatternFrom:(CGPoint)fromPoint to:(CGPoint)toPoint forWidth:(CGFloat)width
{
    
    if (CGRectContainsPoint(self.frame, fromPoint)) {
        NSLog(@"Warning, begin point is not included in the frame of the imageView");
    }
    
    if (CGRectContainsPoint(self.frame, toPoint)) {
        NSLog(@"Warning, end point is not included in the frame of the imageView");
    }
    
    UIBezierPath *path = [[UIBezierPath alloc] init];
    UIImage *image;
    
    [path moveToPoint:fromPoint];
    [path addLineToPoint:toPoint];
    [path setLineWidth:(width > 0.0f ? width: DefaultDottedImageWidth)];
    CGFloat dashes[] = { path.lineWidth, path.lineWidth * 2 };
    [path setLineDash:dashes count:2 phase:0];
    [path setLineCapStyle:kCGLineCapRound];
    UIGraphicsBeginImageContextWithOptions(self.frame.size, false, 2);
    [path stroke];
    image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    if (!image) {
        NSLog(@"Error creating dotted image");
    }
    
    [self setImage:image];
}

@end