Scale image in iOS without lose quality much - UIImage category

UIImage+Resize.h

#import <UIKit/UIKit.h>

@interface UIImage (Resize)

- (UIImage*)scaleBy:(float)scale;

@end

UIImage+Resize.m

#import "UIImage+Resize.h"

@implementation UIImage (Resize)

- (UIImage*)scaleBy:(float)scale
{
    CGSize size = CGSizeMake(self.size.width * scale, self.size.height * scale);
    UIGraphicsBeginImageContextWithOptions(size, YES, 0.0);
    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return imageCopy;
}

@end