如何使用return / enter键创建UIKeyCommand？ [英] How can I make a UIKeyCommand with the return/enter key?

问题描述

我想制作仅使用 [return] 键的 UIKeyCommand 。到目前为止我已经尝试过：

I'd like to make a UIKeyCommand that uses only the [return] key. So far I've tried:

UIKeyCommand *selectCommand = [UIKeyCommand keyCommandWithInput:@"\n" modifierFlags:0 action:@selector(chooseSelection:)];

输入键没有全局常量，如上，下，左，右，和转义（来自 UIResponder.h ）：

There's no global constant for the enter key, like there is for up, down, left, right, and escape (from UIResponder.h):

// These are pre-defined constants for use with the input property of UIKeyCommand objects.
UIKIT_EXTERN NSString *const UIKeyInputUpArrow         NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputDownArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputLeftArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputRightArrow      NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputEscape          NS_AVAILABLE_IOS(7_0);

还有什么我可以尝试捕获return / enter键吗？

Is there anything else I could try to capture the return/enter key?

推荐答案

使用 @\ r进行回车而不是换行的@\ n应该有效。

Using @"\r" for carriage return instead of @"\n" for newline should work.

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