ios - 未调用 UITextField 委托(delegate)方法

Question

所以我在 UIViewController(不是 TableView Controller )中的 UITableView 的单元格中有一系列文本字段。我可以编辑文本字段，但不会调用诸如 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField 之类的委托(delegate)方法。

View Controller 有它的委托(delegate)集:

@interface NRSignUpViewController : UIViewController<UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource, UITableViewDelegate, UITableViewDataSource>

声明的字段:

@property (nonatomic, strong) UITextField *firstName;
@property (nonatomic, strong) UITextField *lastName;
@property (nonatomic, strong) UITextField *email;

委托(delegate)在 viewDidLoad 中设置:

_firstName.delegate = self;
_lastName.delegate = self;
_email.delegate = self;

这是 cellForRowAtIndexPath:

- (UITableViewCell *)tableView:(UITableView *)table cellForRowAtIndexPath:(NSIndexPath     *)indexPath {
    UITableViewCell *cell = [table dequeueReusableCellWithIdentifier:@"Cell"];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                      reuseIdentifier:@"Cell"];
        cell.accessoryType = UITableViewCellAccessoryNone;
    }

   UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, table.frame.size.width-20, 30)];
   tf.textColor = [UIColor blackColor];
   tf.returnKeyType = UIReturnKeyNext;
   switch (indexPath.row) {
       case 0:
           tf.placeholder = @"First name";
           tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
           _firstName = tf;
           break;
       case 1:
           tf.placeholder = @"Last name";
           tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
           _lastName = tf;
           break;
       case 2:
            tf.placeholder = @"Email address";
            tf.autocapitalizationType = UITextAutocapitalizationTypeNone;
           tf.keyboardType = UIKeyboardTypeEmailAddress;
           _email = tf;
           break;
       default:
           break;
    }

    [cell.contentView addSubview:tf];
    return cell;
}

有什么可能遗漏的想法吗？

Answer 1

您在 viewDidLoad 中设置委托(delegate)，但直到 cellForRow... 才真正创建文本字段。