1、通过在textView中键盘上方添加一个toolBar来实现取消键盘的功能，可以添加其他功能：
1 UIToolbar * topView = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 30)]; 2 [topView setBarStyle:UIBarStyleBlackTranslucent]; 3 4 UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; 5 UIBarButtonItem * doneButton = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)]; 6 NSArray * buttonsArray = @[btnSpace, doneButton]; 7 8 [topView setItems:buttonsArray]; 9 [_textView setInputAccessoryView:topView];
2、如果上方有一个navigationBar，则可以在bar上添加一个DONE按钮来取消键盘，如果bar上已经有其他功能按键，则可以弹出键盘前保存当前barButtonItem，然后在弹出键盘（利用shouldBeginEditing委托来触发）后用取消键盘按钮来替换：
1 - (BOOL)textViewShouldBeginEditing:(UITextView *)textView 2 { 3 self.rightButton = self.navigationItem.rightBarButtonItem; 4 UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)]; 5 self.navigationItem.rightBarButtonItem = doneButton; 6 return YES; 7 }
键盘消失后再赋回原来的按钮：
- (void)dismissKeyBoard { [_textView resignFirstResponder]; self.navigationItem.rightBarButtonItem = self.rightButton; }