Fragmented knowledge points such as image capturing and de-aliasing

Screenshot:

- (UIImage *)imageFromImage:(UIImage *)image inRect:(CGRect)rect {    CGImageRef sourceImageRef = [image CGImage];    CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);    UIImage *newImage = [UIImage imageWithCGImage:newImageRef];    return newImage;}

Upload an image of the original file, and then extract the image size.

Set the image as follows:

CGContextTranslateCTM(context, 0.0, self.bounds.size.height);    CGContextScaleCTM(context, 1.0, -1.0);

Image Area sawtooth:

CGRect imageRrect = CGRectMake(0, 0,imageView.frame.size.width, imageView.frame.size.height);   UIGraphicsBeginImageContext(imageRrect.size);   [imageView.image drawInRect:CGRectMake(1,1,imageView.frame.size.width-2,imageView.frame.size.height-2)];   imageView.image = UIGraphicsGetImageFromCurrentImageContext();   UIGraphicsEndImageContext();

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