Convert image to hex

objc_hex.m

// Objective-C
UIImage *image = [UIImage imageNamed:<#(NSString *)#>];
NSData *imageData = UIImagePNGRepresentation(image);
NSInteger len = imageData.length;
Byte *bytes = (Byte *)[imageData bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:len * 5];
[result appendString:@"{"];
for (NSUInteger i = 0; i < len; i++) {
    if (i) {
        [result appendString:@","];
    }
    [result appendFormat:@"0x%x", bytes[i]];
}
[result appendString:@"}"];

NSLog(@"%@", result);