Whilst using Xcode 4.0 and trying to debug and see what value is held in what variable - or see what objects are in an array etc, I always seem to get "Summary Unavailable" or "Invalid Summary".Whilst using Xcode 4.0 and trying to debug and
阅读背景：
xcode 4调试显示大多数对象的“摘要不可用”
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