Question

I want to create an iOS app that contains a uiimageview and a button so that when a user hits a button the image view is generated by a set of 2 nested while loops that set the pixels for the uiimageview. i can do this in C with a bitmap quite easily but I’m not sure how to approach this for iOS could I save a bitmap to NSUserDefaults and load it from there?
Not sure, thanks for the help.

Answer 1

UIImageView works with UIImage, which is a UIKit‘s wrapper for CGImage. In any case you should have either a CGImage or UIImage. What can you do? Draw an image dynamically using CoreGraphics and/or UIKit’s drawing methods (take a look at Quartz2D Programming Guide). Or if you can have a raw byte data of your image you can directly create an UIImage instance:

NSData *imgData = [[NSData alloc] initWithBytes:(const void*)myByteArray length:sizeof(myByteArray)];
UIImage *img = [[UIImage alloc] initWithData:imgData];

then just set your UIImageView‘s image property:

self.myImageView.image = img;