代码详解ios键盘收起问题

//在viewDidLoad中 添加点击手势，为了关闭键盘的操作
UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];
tap1.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:tap1];
//点击空白处的手势要实现的方法，设置当前输入结束
-(void)viewTapped:(UITapGestureRecognizer*)tap1
{
  [self.view endEditing:YES]; 
}

//设置回车键的类型和代理
self.themeTextField.returnKeyType = UIReturnKeyDone;
self.themeTextField.delegate = self ;
#pragma mark - textField delegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  [textField resignFirstResponder];
  //[self.view endEditing:YES];
  return YES;
}

//设置回车键的类型和代理，当前类是继承自UITextView的一个类 
self.delegate = self ; 
self.returnKeyType = UIReturnKeyDone ;

//UITextViewDelegate代理，当键盘输入变化时调用，可以通过该方法判断输入的内容
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
 replacementText:(NSString *)text
{
  //判断是否是回车键
  if ([text isEqualToString:@"\n"]) {
    [textView resignFirstResponder];
    return NO;
  }
  return YES ;
}