You should use something like this.
yourLayer.magnificationFilter = kCAFilterNearest;
You need to import QC first, but you already have it.
EDIT
magnificationFilter Filter used when increasing the size of content.
@property (copy) NSString * magnificationFilter discussion Possible magnificationFilter values ββare shown in the Scaling Filters section. The default value is kCAFilterLinear.
Availability Available in iOS 2.0 and later. Announced in CALayer.h
Fogmeister
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