Day 118 – Make my first iPhone app in 16 weeks (imageNamed vs. imageWithContentsOfFile)

This is part of “Make my first iPhone app in 16 weeks” series.

imageNamed vs. imageWithContentsOfFile

  • imageNamed decompresses the image immediately
  • imageNamed cached by OS (perfect for frequently used images)
  • imageNamed is used by iOS to load nib referenced images (images referenced in nib or storyboard)
  • imageWithContentsOfFile decompresses the image on demand (lazily loaded when it displays on the screen)
  • imageWithContentsOfFile is NOT cached by OS (perfect for infrequently used images so that there is no cache pressure)

 

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