UILineBreakMode 与 NSLineBreakMode

我看到一些 UIStringDrawing 方法已更新为使用 NSLineBreakMode 而不是 iOS 6.0 中的 UILineBreakMode：

E.g.

- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode

我如何检查这一点以确保我的 iOS 5 及更低版本的用户继续使用 UILineBreakMode？

无需检查。这些只是枚举，它们映射到相同的值

您可以看到这里没有真正的区别：

UI换行模式 http://developer.apple.com/library/ios/#documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html# vs NSLineBreakMode http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSParagraphStyle_Class/Reference/Reference.html#//apple_ref/c/tdef/NSLineBreakMode

  enum {
   NSLineBreakByWordWrapping = 0,
   NSLineBreakByCharWrapping,
   NSLineBreakByClipping,
   NSLineBreakByTruncatingHead,
   NSLineBreakByTruncatingTail,
   NSLineBreakByTruncatingMiddle
};
typedef NSUInteger NSLineBreakMode



typedef enum {
   UILineBreakModeWordWrap = 0,
   UILineBreakModeCharacterWrap,
   UILineBreakModeClip,
   UILineBreakModeHeadTruncation,
   UILineBreakModeTailTruncation,
   UILineBreakModeMiddleTruncation,
} UILineBreakMode;