textview 不响应事件的原因。没有给控

　　textview 不响应事件的原因。没有给控件设置代理

　设置代理：

    textView.delegate = self;

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http://www.iphonedevsdk.com/forum/iphone-sdk-development/4134-handle-keyboard-done-press-text-field.html

点击done 关闭键盘、

@interface MyViewController : UIViewController <UITextFieldDelegate>

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
        [theTextField resignFirstResponder];
        return YES;
}