IOS：用iPad KeyBoard的回车键动作
问题描述：
我有两个文本字段，在第一个文本字段中我写Hello，当我按下进入iPad键盘时，我希望在第二个文本字段中显示World;如何在我的应用程序中使用enter来创建操作？
I have two textfield, in first textfield I write "Hello" and when I push enter in iPad keyboard, I want that in second textfield appear "World"; How can I use enter to create an action in my application?
答
您通常会将视图控制器指定为文本字段的委托然后实现 textFieldShouldReturn：方法，例如：
You would typically assign your view controller as the text field's delegate and then implement the textFieldShouldReturn: method, e.g.:
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
otherTextField.text = @"World"
return YES;
}