UITextField 获得焦点，然后由于在 textFieldShouldReturn 中返回 YES 而立即失去焦点 [英] UITextField get focus and then lose focus immediately due to return YES in textFieldShouldReturn

问题描述

这是我的代码:

- (void)viewDidLoad {
    [super viewDidLoad];

    // passwordTextField cannot get focus after click next key due to this RAC
    RAC(self.loginButton, enabled) = [RACSignal combineLatest:@[self.userTextField.rac_textSignal,
                                                                self.passwordTextField.rac_textSignal]
                                                       reduce:^id (NSString *user, NSString *password) {
                                                           if ([user length] > 0 && [password length] > 0) {
                                                               return @YES;
                                                           }
                                                           return @NO;
                                                       }];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    if (textField == self.userTextField) {
        [self.passwordTextField becomeFirstResponder];
    } else {
        [self loginAction:textField];
    }
    // passwordTextField cannot get focus after click next key due to returning YES
    return YES;
}

- (void)loginAction:(id)sender
{
    [self.userTextField resignFirstResponder];
    [self.passwordTextField resignFirstResponder];
    // some login actions
}

当单击 userTextField 中的返回键时，我想将焦点移至 passwordTextField.但是 passwordTextField 获得焦点然后立即失去焦点.我创建了一个 UITextField 的子类并试图找到原因.我发现如果我在函数 textFieldShouldReturn 中返回 YES，则 passwordTextField 将收到一个 insertText 调用.然后 passwordTextField 将立即收到 resignFirstResponder 调用.我不知道 为什么我们现在必须在 textFieldShouldReturn 函数中返回 NO.有人可以帮我吗?

I want to move focus to passwordTextField when click return key in userTextField. But the passwordTextField get focus and then lose focus immediately. I created a subclass of UITextField and try to find the reason. I found that if I return YES in function textFieldShouldReturn, the passwordTextField will get a insertText call. Then the passwordTextField will receive resignFirstResponder call immediately. I don't know why we must return NO in function textFieldShouldReturn now. Any one can help me?

========

添加更多信息:

我发现这个问题只有在我使用 ReactiveCocoa 时才会出现.ReactiveCocoa 的版本是 2.5.

I found that this issue will only appear when I user ReactiveCocoa. The version of ReactiveCocoa is 2.5.

推荐答案

只需设置标签您的文本字段并输入此代码

Just set tag your textfield and put this code

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    NSInteger nextTag = textField.tag + 1;
    // Try to find next responder
    UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
    if (textField.tag == 0) {
        // Found next responder, so set it.
        [nextResponder becomeFirstResponder];
    } else {
        // Not found, so remove keyboard.
        [textField resignFirstResponder];
    }
    return NO;
}

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