Question

我在子视图中有一个textField，我已经将其子类化了。现在我想在我原来的视图中调用textField的委托方法。

我尝试使用此代码，但不知道这些方法是否被调用：

NewImageViewController *ni = [[NewImageViewController alloc] init];
textField.delegate = ni;

“NewImageViewController”是我的原始视图。

修改

我的Subclass.h：

#import <UIKit/UIKit.h>

@protocol SubviewProtocol<NSObject>
- (void) textFieldDidEndEditing:(UITextField *)inTextField;
- (void) textFieldDidBeginEditing:(UITextField *)inTextField;
@end

@interface PopOverViewController : UIViewController <FPPopoverControllerDelegate>

@property (strong, nonatomic) UITextField *textField;
@property (nonatomic, assign) id<SubviewProtocol> delegate;

@end

Subview.m中的

viewDidLoad：

textField = [[UITextField alloc] initWithFrame:CGRectMake(5, 5, 170, 30)];
    textField.placeholder = @"Example";
    textField.backgroundColor = [UIColor whiteColor];
    textField.alpha = 0.9;
    textField.borderStyle = UITextBorderStyleLine;
    textField.layer.borderColor = [[UIColor grayColor]CGColor];
    textField.textColor = [UIColor blackColor];
    textField.delegate = self;
    [self.view addSubview:textField];

在NewImageViewController.m中委托方法：

-(void)textFieldDidBeginEditing:(UITextField *)textField {
    NSLog(@"asd");
}

-(void)textFieldDidEndEditing:(UITextField *)textField {
    NSLog(@"fgh");
}

Answer 1

因为你在子视图中将UITextField作为属性

就这样做

我发布的示例代码与您的案例类似希望它可以帮助你只是通过它可能会帮助你

 #import "SubView.h"
 @implementation SubView
 @synthesize aTextField;

 - (id)initWithFrame:(CGRect)frame
 {
self = [super initWithFrame:frame];
if (self) {
    // Initialization code
    UITextField *atextField = [[UITextField alloc]initWithFrame:CGRectZero];
    self.aTextField = atextField;
    [self addSubview:atextField];
    [atextField release];

  }
 return self;
}

   -(void)dealloc{
    [self.aTextField release];
    [super dealloc];
   }

 //i am setting the frame hear 
 -(void)layoutSubviews
   {
      self.aTextField.frame = CGRectMake(20,30, 100, 45);


   }

  @end


   // in your main view

   #import "ViewController.h"
   #import "SubView.h"

   @interface ViewController ()<UITextFieldDelegate> // add this

   @end

   @implementation ViewController

   - (void)viewDidLoad
   {
     [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

    //see below lines carfully
      SubView *subView = [[SubView alloc]initWithFrame:self.view.frame];

   subView.aTextField.delegate = self; // you need do this
   subView.aTextField.placeholder = @"type hear";
   subView.aTextField.backgroundColor = [UIColor greenColor];

   [self.view addSubview:subView];

   }

   - (void)didReceiveMemoryWarning
   {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }  

     //check out in main view
  -(void) textFieldDidEndEditing:(UITextField *)inTextField
    {
          NSLog(@"textField end editing");
    }
     - (void) textFieldDidBeginEditing:(UITextField *)inTextField
      {
          NSLog(@"textField begin editing");
      }


   @end

Answer 2

您可以在textField所在的子视图中实现委托方法，而不是在原始视图中设置委托。

您可以为子视图实施协议，如下所示：

在YourSubview.h文件中

@protocol YourSubviewProtocol<NSObject>
- (void) textFieldDidEndEditing:(UITextField *)inTextField;
- (void) textFieldDidBeginEditing:(UITextField *)inTextField;
@end
@interface YourSubview
@property (nonatomic, assign) id<YourSubviewProtocol> delegate;
//properties and methods

@end

在实现文件中，即YourSubview.m，您必须从TextField委托方法中调用这些委托方法，类似这样

[[self delegate] textFieldDidBeginEditing:textField];

在文件NewImageViewController.h

中

@interface NewImageViewController<YourSubviewProtocol>

//properties and methods

@end

在NewImageViewController.m文件中，您必须实现委托方法：

- (void) textFieldDidEndEditing:(UITextField *)inTextField;
{
  //do the operation
}
- (void) textFieldDidBeginEditing:(UITextField *)inTextField;
{
  //do the operation
}

希望这会有所帮助，一切顺利！：）

TextField在其他ViewController中的Delegate

2 个答案: