I knit a lot, almost exclusively from PDF patterns. I purchased the Knit Companion app for $18, but the Good Reader app works MUCH better for me. Making notes and annotations while I work to personalize changes Ive made is so great, and I can share the files between my iPhone and iPad. Probably the best thing for knitters is the ability to track ties when knitting from a chart. I use the highlight line with 50% opacity and always know what row Im on. I highly recommend it!
lynnceline about GoodReader PDF Editor & Viewer, v4.11.0