UIImage crop 및 resize category 추가

iOS 개발 하다 보니 image를 crop 하거나 resize를 해야 하는 경우가 많더구요.

구글링 해보니 괜찮게 만들어 놓은 소스도 많아서 참고해서 UIImage에 Category로 만들어서 사용하고 있습니다. 

1. @implementation UIImage ( NBUIImageCrop )
2. - (UIImage *)crop:(CGRect)rect {
3.     if (self.scale > 1.0f) {
4.         rect = CGRectMake(rect.origin.x * self.scale,
5.                           rect.origin.y * self.scale,
6.                           rect.size.width * self.scale,
7.                           rect.size.height * self.scale);
8.     }
9.    
10.     if ([self imageOrientation] == UIImageOrientationLeft) {
11.         rect.size = CGSizeMake(rect.size.height, rect.size.width);
12.         rect.size = CGSizeMake(rect.size.height, rect.size.width);
13.         rect.origin = CGPointMake(rect.origin.y, rect.origin.x);
14.     }
15.     else if ([self imageOrientation] == UIImageOrientationRight) {
16.         rect.size = CGSizeMake(rect.size.height, rect.size.width);
17.         rect.origin = CGPointMake(rect.origin.y, rect.origin.x);
18.     }
19.  
20.     CGImageRef imageRef = CGImageCreateWithImageInRect(self.CGImage, rect);
21.     UIImage *result = [UIImage imageWithCGImage:imageRef scale:self.scale orientation:self.imageOrientation];
22.     CGImageRelease(imageRef);
23.     return result;
24. }
25.  
26. - (UIImage *)resizeToFitWidth:(CGFloat)width
27. {
28.     CGSize size = CGSizeMake(width, self.size.height * width/self.size.width);
29.     UIGraphicsBeginImageContext(size);
30.     [self drawInRect:CGRectMake(0,0,size.width,size.height)];
31.     UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
32.     UIGraphicsEndImageContext();
33.     return newImage;
34. }
35. @end

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