iOS app “next” key won't go to the next text f

问题:

I have a simple scene (using storyboard in IB) with a Username and Password text box. I've set the keyboard to close when you are on the Password text field but can't get the next(return) button to work on the Username to switch the focus (or First Responder) to the Password text box.

I'm closing the keyboard while on the Password text field like this:

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
if (theTextField == self.textPassword) {
    [theTextField resignFirstResponder];
}
return YES;
}

I know it is something similar to this but just can't nail it down.

回答1:

The return key doesn't do anything special in a text field by default. You need to explicitly change the first responder:

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    if (theTextField == self.textPassword) {
        [theTextField resignFirstResponder];
    } else if (theTextField == self.textUsername) {
        [self.textPassword becomeFirstResponder];
    }
    return YES;
}

回答2:

I use this code that allows me to control the form behavior in the storyboard:

-(BOOL) textFieldShouldReturn:(UITextField *)textField{
    if(textField.returnKeyType==UIReturnKeyNext) {
        UIView *next = [[textField superview] viewWithTag:textField.tag+1];
        [next becomeFirstResponder];
    } else if (textField.returnKeyType==UIReturnKeyDone) {
        [textField resignFirstResponder];
    }
    return YES;
} 

All you need is to assign the order value as tag, and returnkey according to Next or Done on each input control.

回答3:

for those who want to use Swift language:

class MyClass: UIViewController, UITextFieldDelegate {

@IBOutlet weak var text1: UITextField!
@IBOutlet weak var text2: UITextField!
@IBOutlet weak var text3: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    text1.delegate = self
    text2.delegate = self
    text3.delegate = self


}

//....

func textFieldShouldReturn(textField: UITextField) -> Bool{
    if textField == self.text1 {
        self.text2.becomeFirstResponder()
    }else if textField == self.text2{
        self.text3.becomeFirstResponder()
    }else{
        self.text1.becomeFirstResponder()
    }
    return true
 }

 //...

}

:-)

回答4:

You have to add the UITextFieldDelegate in the header-file. Then you have to set

theTextField.delegate = self;

in the viewDidLoad-method. After that you can go on with

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    if (theTextField == self.textPassword) {
        [theTextField resignFirstResponder];
    } else if (theTextField == self.textUsername) {
        [self.textPassword becomeFirstResponder];
    }
    return YES;
}

回答5:

Many solutions to this problem exist. See the responses posted to this question: How to navigate through textfields (Next / Done Buttons).

Read more in the UIResponder Class Reference.

回答6:

Here's what you would put:

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    if (theTextField == self.textPassword) {
        [theTextField resignFirstResponder];
    } else if (theTextField == self.usernameField) {
        [self.textPassword becomeFirstResponder];
    }
return YES;
}

回答7:

You can use this subclass of UITextfield that dynamically change the UIReturnKey according to text/string condition, and then perform your continuation action in the textFieldShouldReturn:(UITextField *)textField delegate

if (textField.returnKeyType == UIReturnKeyNext)

https://github.com/codeinteractiveapps/OBReturnKeyTextField

回答8:

I got an issue that password textfield get focus and then lose focus immediately. At last I found that we'd better return NO in function textFieldShouldReturn:. If we return YES, the text field will get a insertText: call. Then it will lose focus. Don't know the reason.

I have created a new question for this issue: UITextField get focus and then lose focus immediately due to return YES in textFieldShouldReturn

If anyone knows the reason, please let me know. Thanks.

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    if (theTextField == self.textPassword) {
        [theTextField resignFirstResponder];
    } else if (theTextField == self.textUsername) {
        [self.textPassword becomeFirstResponder];
    }
    // we'd better return NO here
    return NO;
}

回答9:

Here is a Swift 2.0 Version of Rob Mayoff

func textFieldShouldReturn(textField: UITextField) -> Bool {
    if textField == self.emailTextField {
        self.passwordTextField.becomeFirstResponder()
    }else{
        self.passwordTextField.resignFirstResponder()
    }
    return false
}

回答10:

I tried to use Esteve's answer but it doesn't work. Maybe because I'm using xib files. What I've done is change his code to make it works in my code.

It works in the same way. All you need is to assign the order value as tag, and return key according to Next or Done or Send on each input control.

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

    [textField resignFirstResponder];

    if(textField.returnKeyType==UIReturnKeyNext) {

        UITextField *next = (UITextField *)[self.view viewWithTag:textField.tag+1];
        [next becomeFirstResponder];

    } else if (textField.returnKeyType==UIReturnKeySend) {

        //Do whatever you want with the last TextField
    }

    return YES;
}