UILineBreakMode与NSLineBreakMode对比

Question

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

E.g。

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

我该如何检查以确保我的iOS 5及以下用户继续使用UILineBreakMode？

Answer 1

无需检查。这些只是枚举，它们映射到相同的值

你可以看到这里没有真正的区别：

UILineBreakMode vs NSLineBreakMode

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



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

Answer 2

ios6中不推荐使用UILineBrakeMode http://developer.apple.com/library/ios/#documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html#//apple_ref/doc/c_ref/UILineBreakMode