ios - 如何使用返回/输入键创建 UIKeyCommand？

Question

我想制作一个仅使用 [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，就像向上、向下、向左、向右和转义键一样(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 try catch 返回/输入键的吗？

Answer 1

使用 @"\r" 代替 @"\n" 换行应该可行。