image.png
引用IOS自带framework中的Accelerate
- (UIImage *)croppedImageWithFrame:(CGRect)frame {
frame = CGRectMake(frame.origin.x * self.scale,
frame.origin.y * self.scale,
frame.size.width * self.scale,
frame.size.height * self.scale);
CGImageRef sourceImageRef = [self CGImage];
CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, frame);
UIImage *newImage = [UIImage imageWithCGImage:newImageRef scale:[self scale] orientation:[self imageOrientation]];
CGImageRelease(newImageRef);
return newImage;
}
