如何手动启用或禁用键盘上的返回键？

Question

我有一个UITextView从键盘接收输入.选中"自动启用返回键"复选框,因此当该项UITextView为空时,将禁用"返回"键.

键盘上方有一个表情符号栏,可以添加表情符号UITextView,但这就是问题所在; 当它UITextView是空的时我添加一个表情符号UITextView:

[inputTextView insertText:@"\ue40d"];

然后仍然禁用ReturnKey,尽管UITextView的text属性不为空.

插入表情符号后我试过这个:

[inputTextView setEnablesReturnKeyAutomatically:NO];

没有结果.看起来只能通过键盘输入字符来触发启用/禁用键盘的返回键.

任何想法如何手动启用/禁用Return键？

Answer 1

这有点麻烦，但您可以尝试通过粘贴板插入文本：

UIPasteboard* generalPasteboard = [UIPasteboard generalPasteboard];

// Save a copy of the system pasteboard's items
// so we can restore them later.
NSArray* items = [generalPasteboard.items copy];

// Set the contents of the system pasteboard
// to the text we wish to insert.
generalPasteboard.string = text;

// Tell this responder to paste the contents of the
// system pasteboard at the current cursor location.
[textfield paste: nil];

// Restore the system pasteboard to its original items.
generalPasteboard.items = items;

// Free the items array we copied earlier.
[items release];