iphone - Hide keyboard on ViewWillAppear

Question

i have a screen having navigation controller and text field. when i move next and come back i want the keyboard should be hidden in first screen. I am hiding keyboard like on textfield event.

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return NO;
}

But how to do that in View related events so that whenever my view appears keyboard is hidden.. Pls guide/Help. thanks in adv.

Answer 1

我认为这也是删除键盘的好方法，iOS App如果您UITextView或未UITextField通过IBOutlet.

如果您想使用UIViewController诸如 withviewWillAppear等生命周期事件隐藏键盘。请遵循此

-(void)viewWillAppear:(BOOL)animated    {
    [super viewWillAppear:animated];
    [[self view] endEditing:YES];
}

否则，如果您使用IBOutLet此代码连接的对象也可以正常工作，就像您描述的那样。

[yourTextField resignFirstResponder];

Answer 2

Add this code to your ViewWillAppear :

for(id obj in self.view.subviews)
    {
        if([obj isKindOfClass:[UITextField class]])
        {
             [obj resignFirstResponder];
        }
    }

This would take in all the textfields in that particular view here it is the whole view and add the code you had written previously for removing the keyboard.

Answer 3

一个好习惯是在屏幕的-viewWillDisappear. 因此，当您当时从一个屏幕导航到另一个屏幕时，它将从该屏幕上移除键盘。

- (void)viewWillDisappear:(BOOL)animated
{
    [self.view endEditing:YES];
    [super viewWillDisappear:animated];
}

对于多个文本字段，最好使用-endEditing该特定视图而不是-resignFirstResponder任何单个文本字段。看看我的答案。

Answer 4

//This is for Swift
override func viewWillAppear(animated: Bool)
{
   self.view.endEditing(true)
}

Answer 5

您做错的事情是，当您将前一个控制器移回当前控制器时，由于前一个控制器的选定文本字段，键盘已启动。

在当前控制器中，代码：

-(void)viewWillAppear:(BOOL)animated    {
    [super viewWillAppear:animated];
    [[self view] endEditing:YES];
}

它将不起作用，因为在此控制器上未选择任何文本字段。所以你需要做的是在之前的控制器 viewWillDisappear 方法中编写相同的代码，它肯定会解决你的问题。

- (void)viewWillDisappear:(BOOL)animated
{
    [self.view endEditing:YES];
    [super viewWillDisappear:animated];
}