修复NSTextAlignmentCenter引起的警告

#ifdef __IPHONE_6_0 // iOS6 and later
#   define UITextAlignmentCenter    NSTextAlignmentCenter
#   define UITextAlignmentLeft      NSTextAlignmentLeft
#   define UITextAlignmentRight     NSTextAlignmentRight
#   define UILineBreakModeTailTruncation     NSLineBreakByTruncatingTail
#   define UILineBreakModeMiddleTruncation   NSLineBreakByTruncatingMiddle
#endif
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原文地址：https://www.cnblogs.com/vagrantatbeijing/p/3433710.html