UITextView 退出键盘的方式

  这里介绍三种方法：

1.如果你程序是有导航条的，可以在导航条上面加多一个Done的按钮，用来退出键盘，当然要先实UITextViewDelegate。

代码如下：

- (void)textViewDidBeginEditing:(UITextView *)textView {
   UIBarButtonItem *done =    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];
   self.navigationItem.rightBarButtonItem = done;
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    self.navigationItem.rightBarButtonItem = nil;
}

- (void)leaveEditMode {
    [self.textView resignFirstResponder];
}

- (void)textViewDidBeginEditing:(UITextView *)textView {
   UIBarButtonItem *done =    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];
   self.navigationItem.rightBarButtonItem = done;    
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    self.navigationItem.rightBarButtonItem = nil;
}

- (void)leaveEditMode {
    [self.textView resignFirstResponder];
}

效果类似这样：

2.如果你的textview里不用回车键，可以把回车键当做退出键盘的响应键。
代码如下：

#pragma mark - UITextView Delegate Methods
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }
    return YES;
}

#pragma mark - UITextView Delegate Methods
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }
    return YES;
}

这样无论你是使用电脑键盘上的回车键还是使用弹出键盘里的return键都可以达到退出键盘的效果。

3.第三种方法感觉效果比上面两种都好，就是在弹出的键盘上面加一个view来放置退出键盘的Done按钮。

代码如下：

 UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
    [topView setBarStyle:UIBarStyleBlack];

    UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];

    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

    UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];


    NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];
    [doneButton release];
    [btnSpace release];
    [helloButton release];

    [topView setItems:buttonsArray];
    [tvTextView setInputAccessoryView:topView];

-(IBAction)dismissKeyBoard
{
    [tvTextView resignFirstResponder];
}

 UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
    [topView setBarStyle:UIBarStyleBlack];
    
    UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];
    
    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    
    UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];
    
    
    NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];
    [doneButton release];
    [btnSpace release];
    [helloButton release];
    
    [topView setItems:buttonsArray];
    [tvTextView setInputAccessoryView:topView];

-(IBAction)dismissKeyBoard
{
    [tvTextView resignFirstResponder];
}

主要是使用了uitextview的InputAccessoryView的属性来达到这样的效果，下面是效果图：

先写到这里，以后有好的在补充！

原文地址：
http://blog.csdn.net/bl1988530/article/details/6694897#

主要是使用了uitextview的