iPhone: How can you draw a piece of an image
- by Mark
Code sample
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, self.frame.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, CGRectMake(0.0, 0.0, self.frame.size.width, self.frame.size.height), [UIImage imageNamed:@"sample.png"].CGImage);
CGContextRestoreGState(context);
}
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I would like to copy a certain rect within an image to the context, so not the entire image is drawn but just a piece of the image. Does anyone have a solution for this? I can't find anything on google nor the documentation.
I know there are alternatives like:
1. Create a UIView with clipping and then just position the UIImageView within it.
2. Create the UIImageView within the UIScrollView and use content offset.
But I think those are lame...
