以UILineBreakModeTailTruncation 、UITextAlignmentCenter 举例 修改如下：

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000

            NSLineBreakMode lbm = NSLineBreakByTruncatingTail;

#else

            UILineBreakMode lbm = UILineBreakModeTailTruncation;

#endif



#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000

            NSTextAlignment ta = NSTextAlignmentCenter;

#else

            UITextAlignment ta = UITextAlignmentCenter;

#endif