如何用回车/回车键制作一个UIKeyCommand？[英] How can I make a UIKeyCommand with the return/enter key?

问题描述

我想制作一个只使用 [return] 键的 UIKeyCommand.到目前为止，我已经尝试过:

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

enter 键没有全局常量，就像 up、down、left、right 和 escape 一样(来自 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返回/输入键的吗?

推荐答案

使用 @"\r" 回车而不是 @"\n" 换行应该可以.

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