如何使用返回/输入键生成UIKeyCommand？

Question

我想做一个只使用UIKeyCommand键的[return]。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”、“左”、“右”和“转义”(来自UIResponder.h)一样：

// 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);

我还可以尝试捕获返回/输入键吗？

Answer 1

使用@"\r"进行回车而不是对换行符使用@"\n"应该有效。