问题
Are there good tools for checking PNG files for issues that can be how I have ended up here? At first i feared with was an issue with the many thousands of "tiles" in my learning app (at 3 resolutions), but it seems one or more specific png files have an internal issue.
回答1:
pngcheck works well and is a good resource. In addition, an OS-X app (in the app store) called "Quick Opaque" easily stripped out the (unneeded) alpha channel data from my png file, which cured the IDAT problem.
来源：https://stackoverflow.com/questions/28060499/xcode-6-giving-libpng-error-too-many-idats-found-error