1. - (void)textViewDidBeginEditing:(UITextView *)textView {
2. UIBarButtonItem *done = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];
3. self.navigationItem.rightBarButtonItem = done;
4. }
5. - (void)textViewDidEndEditing:(UITextView *)textView {
6. self.navigationItem.rightBarButtonItem = nil;
7. }
8. - (void)leaveEditMode {
9. [self.textView resignFirstResponder];
10. }

（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。

1. -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
2. {
3. if ([text isEqualToString:@"\n"]) {
4. [textView resignFirstResponder];
5. return NO;
6. }
7. return YES;
8. }

（3）还有你也可以自定义其他加载键盘上面用来退出，比如在弹出的键盘上面加一个view来放置退出键盘的Done按钮。

1. UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
2. [topView setBarStyle:UIBarStyleBlack];
3. UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];
4. UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
5. UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];
6. NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];
7. [doneButton release];
8. [btnSpace release];
9. [helloButton release];
10. [topView setItems:buttonsArray];
11. [tvTextView setInputAccessoryView:topView];
12. -(IBAction)dismissKeyBoard
13. {
14. [tvTextView resignFirstResponder];
15. }