On Mar 27, 2012, at 2:57 AM, Giacomo Tufano wrote: > That's what I use to generate a thumbnail of sideSize side lenght in iOS3.x > code. > It uses iOS4+ functions for retina displays (I remember that you can assume > iOS4+ with retina displays). > > CGSize newSize = CGSizeMake(sideSize, sideSize); > #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0 > if(UIGraphicsBeginImageContextWithOptions != NULL) > UIGraphicsBeginImageContextWithOptions(newSize, NO, [[UIScreen > mainScreen] scale]); > else > #endif > UIGraphicsBeginImageContext(newSize); > UIGraphicsBeginImageContext(newSize); > [self drawInRect:CGRectMake(0, 0, sideSize, sideSize)]; > // Get the new image from the context > UIImage *thumbnailImage = UIGraphicsGetImageFromCurrentImageContext(); > // End the context > UIGraphicsEndImageContext(); > > It works correctly on retina displays. > To be honest I don't remember why I use that macro to test for iOS4, there > were a reason and that was a workaround but cannot remember why. It works, > anyway. :)
Your macro check is to attempt to remain compatible with the 3.2 or earlier SDK. It has served its purpose and can be retired :). If you no longer support iOS 3.x you can even remove the existence check for UIGraphicsBeginImageContextWithOptions. -- David Duncan _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
