////别忘在 .h 中写代理  <UITextViewDelegate>
 
///UILabel 显示的文本只读，无法编辑，可以根据文字个数自动换行；
///UITextField 可编辑本文，但是无法换行，只能在一行显示；当点击键盘上的return时会收到一个事件做一些事情。
////UITextView 可编辑文本，提供换行功能。
 
UITextView* textView = [[UITextView alloc] initWithFrame:CGRectMake(10, 10, 300, 100)];
    textView.backgroundColor = [UIColor grayColor];
    //文本
    textView.text = @"aa";
    //字体
    textView.font = [UIFont boldSystemFontOfSize:20.0];
    //对齐
    textView.textAlignment = NSTextAlignmentCenter;
    //字体颜色
    textView.textColor = [UIColor redColor];
    //允许编辑
    textView.editable = YES;
    //用户交互     /////////////////////若想有滚动条 不能交互 上为No，下为Yes
    textView.userInteractionEnabled = YES; ///
    //自定义键盘
    //textView.inputView = view;
    //textView.inputAccessoryView = view;
    textView.delegate = self;
    [self.view addSubview:textView];
    //[textView release];
     
 //////////事件
    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    //判断类型，如果是UITextView类型，收起键盘
    for (UIView* view in self.view.subviews) {
        if ([view isKindOfClass:[UITextView class]]) {
            UITextView* tv = (UITextView*)view;
            [tv resignFirstResponder];
        }
    }
}
 
 
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
    return YES;
}
- (BOOL)textViewShouldEndEditing:(UITextView *)textView{
    return YES;
}
 
- (void)textViewDidBeginEditing:(UITextView *)textView{
    NSLog(@"开始编辑");
}
- (void)textViewDidEndEditing:(UITextView *)textView{
    NSLog(@"结束编辑");
}
 
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
 
    return YES;
}
- (void)textViewDidChange:(UITextView *)textView{
    NSLog(@"已经修改");
}
 
- (void)textViewDidChangeSelection:(UITextView *)textView{
    NSLog(@"textViewDidChangeSelection");
}