Tag Archives: Objective-C

Render UIView to UIImage

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There’s a simple way to render a UIView into a UIImage: use the view’s layer, and render it into a bitmap graphic context. Here is the code, phrased as a UIView category:

#import "UIView+RenderUIImage.h"
#import 

@implementation UIView (RenderUIImage)

- (UIImage *)renderAsImage
{
    // setup context
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0f); // use same scale factor as device
    CGContextRef c = UIGraphicsGetCurrentContext();

    // render view
    [self.layer renderInContext:c];

    // get reslting image
    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return result;
}

@end

Just remember to link the QuartzCore.framework and you’re good to go.

Store UIImage in CoreData Without Writing Any Code

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There is an easy but little known way to store many kinds of UIKit objects in CoreData without writing any code. It works for UIImage, UIColor, UIBezierPath, MKPlaceMark, NSDate, and any other class that conforms to the NSCoding protocol.

What you need to do is set the attribute type to Transformable.

That’s it!

Now can set UIImage objects directly into your NSManagedObject objects:

person.thumbnailImage = [UIImage imageNamed:@"defaultPortrait"];
anImageView.image = person.thumbnailImage;