缩放图片

头文件：

 

#import <Foundation/Foundation.h>

@interface UIImage (scale)

- (UIImage *) scaleToSize:(CGSize) size;

@end

 

实现文件：

 

#import "UIImage+Scale.h"

@implementation UIImage (scale)

- (UIImage *) scaleToSize:(CGSize) size{
	UIGraphicsBeginImageContext(size);
  [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
  UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return scaledImage;
}

@end