Viewing iPhone-Optimized PNGs
Q: When I build my iPhone OS application, Xcode optimizes the PNG files within my application's bundle, meaning that Preview can't display them. How can I view these optimized files?
A: When I build my iPhone OS application, Xcode optimizes the PNG files within my application's bundle, meaning that Preview can't display them. How can I view these optimized files?
This optimization is done by the
pngcrush tool, which you can find in
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush (assuming you installed the iPhone SDK in the standard place). In iPhone SDK 3.2 and later, the
pngcrush tool supports a command line option,
-revert-iphone-optimizations, that undoes the optimizations done during the Xcode build process. So, to view an optimized PNG file, you should first undo the optimization and then open it with Preview.
Listing 1 shows how you can use the
pngcrush tool to convert an iPhone-optimized PNG file (
Local.png) to a standard PNG file (
Listing 1 Undoing iPhone PNG optimization
$ /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush \ -revert-iphone-optimizations -q Local.png Local-standard.png
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush -revert-iphone-optimizations -d outdir *.png
之前认为Apple 的iOS 设计的要比 Android 稳定,我错了吗?