objective c blocks - Get warnning when using representationUsingType:NSPNGFileType properties:nil -


i trying convert image nsdata , got below warning. explain me warnning, , how fix it?

cgimageref cgref = [imgview.imageview image]; nsbitmapimagerep *newrep = [[nsbitmapimagerep alloc]initwithcgimage:cgref]; [newrep setsize:imgview.imageview.imagesize]; nsdata *pngdata = [newrep representationusingtype:nspngfiletype properties:nil];


warnning properties of representation:

null passed callee requires non-null argument


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