How to easily resize/optimize an image size with iOS?

Question

My application is downloading a set of image files from the network, and saving them to the local iPhone disk. Some of those images are pretty big in size (widths larger tha

Answer 1

I ended up using Brads technique to create a scaleToFitWidth method in UIImage+Extensions if that's useful to anyone...

-(UIImage *)scaleToFitWidth:(CGFloat)width
{
    CGFloat ratio = width / self.size.width;
    CGFloat height = self.size.height * ratio;

    NSLog(@"W:%f H:%f",width,height);

    UIGraphicsBeginImageContext(CGSizeMake(width, height));
    [self drawInRect:CGRectMake(0.0f,0.0f,width,height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

then wherever you like

#import "UIImage+Extensions.h"

UIImage *newImage = [image scaleToFitWidth:100.0f];

Also worth noting you could move this further down into a UIView+Extensions class if you want to render images from a UIView