同时在自定义 UIView 和 UIViewController 中使用相同的 UITextFieldDelegate 方法答案

【问题标题】：Using same UITextFieldDelegate methods in custom UIView and in UIViewController simultaneously同时在自定义 UIView 和 UIViewController 中使用相同的 UITextFieldDelegate 方法
【发布时间】：2014-04-17 02:38:36
【问题描述】：

我有一个UIView（名为 HCTextFieldView），上面有子视图：UITextField 和 UILabel。

UITextField's委托等于自己。委托方法textFieldDidBeginEditing 和textFieldDidEndEditing 执行文本字段的背景高亮效果。

接下来我将在我的UIViewController 中使用这个自定义UIView (HCTextFieldView)。要处理工具栏中的“下一个”和“上一个”按钮的操作（附加在文本字段的键盘上方），我需要 UIViewController 中相同的文本字段的委托方法，但委托被覆盖。

**@interface HCBaseTextField : UIView <UITextFieldDelegate>**
...
@end

**@implementation HCBaseTextField {}**

...

textField = [[UITextField alloc] initWithFrame:CGRectMake(0, titleLabel.bottom, self.width - 20, self.height - titleLabel.height)];
**textField.delegate = self**;

...

#pragma mark - UITextField delegate

//textFieldBG - UIImageView that act as background

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    [textFieldBg setImage:[[UIImage imageWithName:@"btn_vvod_medium_act"] stretchableImageWithLeftCapWidth:10 topCapHeight:10]];
    return YES;
}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    [textFieldBg setImage:[[UIImage imageWithName:@"btn_vvod_medium_norm"] stretchableImageWithLeftCapWidth:10 topCapHeight:10]];
    return YES;
}

...

@end


**ViewController : UIViewController**

...

HCTextFieldView *textFieldView = [[HCTExtFieldView alloc] init];
textFieldView.textField.delegate = self;

...

//I need to use this methods too but they override previous in UIView delegate
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self.keyboardControls setActiveField:textField];
}

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    [self.keyboardControls setActiveField:textView];
}

【问题讨论】：

标签： ios uitextfield appdelegate uitextfielddelegate

【解决方案1】：

在HCBaseTextField 中设置一个delegate 喜欢

在HCBaseTextField.h中添加一个属性

@property (nonatomic, assign) id<UITextFieldDelegate> textFieldDelagate;

在 HCBaseTextField.m

中

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

    ....
    if (self.textFieldDelagate && [self.textFieldDelagate respondsToSelector:@selector(textFieldShouldBeginEditing:)]) {
        [self.textFieldDelagate textFieldShouldBeginEditing:textField];
    }
    return YES;
}

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    ....

    if (self.textFieldDelagate && [self.textFieldDelagate respondsToSelector:@selector(textFieldDidBeginEditing:)]) {
        [self.textFieldDelagate textFieldDidBeginEditing:textField];
    }
}

... //Other delegate methods if needed

在 ViewController 中：UIViewController

...

HCTextFieldView *textFieldView = [[HCTExtFieldView alloc] init];

textFieldView.textFieldDelagate = self;

...

并实现委托方法。

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    ....

    //Do the stuff
}

【讨论】：