iPhone - User Defaults and UIImages
- by Staros
Hello,
I've been developing an iPhone app for the last few months. Recently I wanted to up performance and cache a few of the images that are used in the UI. The images are downloaded randomly from the web by the user so I can't add specific images to the project. I'm also already using NSUserDefaults to save other info within the app.
So now I'm attempting to save a dictionary of UIImages to my NSUserDefaults object and get...
-[UIImage encodeWithCoder:]: unrecognized selector sent to instance
I then decided to subclass UIImage with a class named UISaveableImage and implement NSCoding. So now I'm at...
@implementation UISaveableImage
-(void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:super forKey:@"image"];
}
-(id)initWithCoder:(NSCoder *)decoder
{
if (self=[super init]){
super = [decoder decodeObjectForKey:@"image"];
}
return self;
}
@end
which isn't any better than where I started. If I was able to convert an UIImage to NSData I would be good, but all I can find are function like UIImagePNGRepresentation which require me to know what type of image this was. Something that UIImage doesn't allow me to do. Thoughts? I feel like I might have wandered down the wrong path...
