Flipping a UIImage horizontally in UIImageView - ios

Question

In my project, I have my image files stored in jpeg format. The code below "works" in that it doesn't crash, but my images don't flip when they're supposed to. I threw a breakpoint in to ensure that the code is running--it is, but the images that are displayed aren't flipped. I'm guessing I'm missing something basic, but it's not jumping out at me.
if (self.isTimer == YES) {
// this is where images get dumped if they exist
NSMutableArray *imageArray = [[NSMutableArray alloc] init];
for (int imageNumber = 1; self.currentItem.photo != nil; imageNumber++) {
NSString *fileName = [NSString stringWithFormat:#"%#-%d", self.currentItem.photo, imageNumber];
if ([UIImage imageNamed:fileName]) {
UIImage *image = [UIImage imageNamed:fileName];
// test whether count is even or odd
if (self.currentItem.sideMultiplier.intValue == 1) {
// if there's only one side to be done, dump unflipped images in array
[imageArray addObject:image];
NSLog(#"regular image added to array");
} else {
// if there are 2 sides, determine if it's even or odd side
if (self.stretchSideMultiplierCount % 2 == 1) {
// add a unflipped image to the array
[imageArray addObject:image];
NSLog(#"regular image added to array");
} else {
// ** I want to add a FLIPPED IMAGE here
UIImage *flippedImage = [UIImage imageWithCGImage:image.CGImage scale:image.scale orientation:UIImageOrientationUpMirrored];
[imageArray addObject:flippedImage];
NSLog(#"flipped image added to array");
}
}
NSLog(#"%# added to imageArray", fileName);
} else {
break;
}
}
I followed this post, but nothing's happening.
How to flip UIImage horizontally?
I added #import <QuartzCore/QuartzCore.h> to my implementation file. Aside from that, I'm out of ideas re: how to flip an image horizontally.
UPDATE: Much easier solution
Rather than flipping the UIImage, I flipped the UIImageView. The code above I used to create my imageArray now looks like this:
if (self.isTimer == YES) {
// this is where images get dumped if they exist
NSMutableArray *imageArray = [[NSMutableArray alloc] init];
for (int imageNumber = 1; self.currentItem.photo != nil; imageNumber++) {
NSString *fileName = [NSString stringWithFormat:#"%#-%d", self.currentItem.photo, imageNumber];
if ([UIImage imageNamed:fileName]) {
UIImage *image = [UIImage imageNamed:fileName];
[imageArray addObject:image];
NSLog(#"image added to array");
NSLog(#"%# added to imageArray", fileName);
} else {
break;
}
}
and the code I used to flip my UIImageView is in the answer below.

Answer 1

Problem solved. Rather than flipping the UIImage, I flipped the UIImageView as follows:
self.myImageView.transform = CGAffineTransformMakeScale(-1, 1);