Fast snapshot any views on iOS 7

Might be you will need to snapshot a particular view into an image. Previously we do like this:

// #import <QuartzCore/QuartzCore.h>
UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *copied = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

On iOS 7 there's an updated API that is much faster:

UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);

[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];

UIImage *copied = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

How efficient is the faster API? It is about 1.8x faster on iPhone 5. Time elapsed was down from 90ms to 50ms.

If you want to create a view already drawn with the image, we can use an even more handy API:

UIView *newView = [view snapshotViewAfterScreenUpdates:YES];

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