textFieldDidBeginEditing:没有被调用 [英] textFieldDidBeginEditing: not getting called

问题描述

我从 this SO 问题中得到了下面的代码.当我开始编辑时，我试图向上滑动文本字段(因为否则它们会被 iPhone 键盘覆盖).但是，日志语句显示 textFieldDidBeginEditing 方法没有被调用.

I got the code below from this SO question. I'm trying to slide up textfields when I begin editing (because they otherwise get covered by the iPhone keyboard). However, the log statement reveals that the textFieldDidBeginEditing method is not getting called.

我在 UIViewController 的两个不同子类中有下面的代码.例如，在其中一个中，我有一个从故事板连接到 UIViewController 的文本字段，如下所示

I have the code below in two different subclasses of UIViewController. In one of them, for example, I have a textfield connected from the storyboard to the UIViewController like this

@property (strong, nonatomic) IBOutlet UITextField *mnemonicField;

我将文本字段移到视图的顶部(即未被键盘覆盖)，以便我可以对其进行编辑以尝试触发日志语句，但它不起作用.文本字段按预期工作，即我输入的数据被保存到 coreData 等.

I moved the textfield up to the top of the view (i.e. not covered by keyboard) so that I could edit it to try to trigger the log statement but it didn't work. The text field otherwise works as expected i.e. the data I enter is getting saved to coreData etc etc.

你能解释一下我可能做错了什么吗?

Can you explain what I might be doing wrong?

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    NSLog(@"The did begin edit method was called");
    [self animateTextField: textField up: YES];
}


- (void)textFieldDidEndEditing:(UITextField *)textField
{
    [self animateTextField: textField up: NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
    const int movementDistance = 180; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed

    int movement = (up ? -movementDistance : movementDistance);

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}

推荐答案

您尚未在 ViewController 类中分配 UITextField 的 delegate:

You have not assigned your delegate of UITextField in your ViewController class:

在您的 viewcontroller.m 文件中，在 ViewDidLoad 方法中，执行以下操作:

In your viewcontroller.m file, In ViewDidLoad method, do this:

self.mnemonicField.delegate=self; 

在您的 viewcontroller.h 文件中，执行以下操作:

In your viewcontroller.h file, do this:

@interface YourViewController : ViewController<UITextFieldDelegate>

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