Question

我有两个班级

ViewController（BaseClass）2。DerivedViewController（派生类）

我在ViewController课程中有一个文本框。是否可以通过继承在DerivedViewController类中使用该文本框？

如果是，如何继承该文本框？

我尝试使用以下代码进行继承，并通过导入ViewController.h成功继承，如下所示。

#import <UIKit/UIKit.h>
#import "ViewController.h>

@interface DerivedViewController : ViewController

@end

现在我的问题是，如何在textField中使用DerivedViewController。我试图实现可重用性的继承概念。当我使用故事板时，如何获取textField并将其放在故事板中的ViewController框中是如此令人困惑。

感谢您的时间:)

ViewController.m

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *firstTB;
@property (weak, nonatomic) IBOutlet UITextField *secondTB;
@property (weak, nonatomic) IBOutlet UILabel *symbolLabel;
@property (weak, nonatomic) IBOutlet UITextField *find;


@end

@implementation ViewController

int resultValue=0;



- (IBAction)saveResult:(id)sender {
    if((self.firstTB.text.length == 0) || self.secondTB.text.length == 0){
        [self showError];
        NSLog(@"Error");
    }else{
        int number1 = [[[self firstTB] text] intValue];
        int number2 = [[[self secondTB] text] intValue];
        resultValue=number1+number2;
        NSLog(@"%d",resultValue);
        [self saveData];
        [self removeShadow];
    }

}
- (IBAction)listResults:(id)sender {
  //  [self findData];
}



//Save Data.........

-(void) saveData{
    BOOL success = NO;
    NSString *alertString = @"Data Insertion failed";
    success = [[DBManager getSharedInstance]saveData:
               resultValue];


    if (success == NO) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:
                              alertString message:nil
                                                      delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    if(success == YES){
        NSLog(@"FY %d",resultValue);
    }
}

  //Find data.......
-(void) findData {

    int n = [[DBManager getSharedInstance]findResult:[[[self find] text] intValue]];
    if (n == 0) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:
                              @"Data not found" message:nil delegate:nil cancelButtonTitle:
                              @"OK" otherButtonTitles:nil];
        [alert show];

    }
    else{
      /*  regNoTextField.text = findByRegisterNumberTextField.text;
        nameTextField.text =[data objectAtIndex:0];
        departmentTextField.text = [data objectAtIndex:1];
        yearTextField.text =[data objectAtIndex:2];  */
        NSLog(@"Data Found %d",n);

    }
}




// For Shadow..... 

-(void)showError{
    [self addShadow];
}


-(void)addShadow{
    if(self.firstTB.text.length == 0 && self.secondTB.text.length == 0){

        [self glowfirstTB:YES];

        [self glowsecondTB:YES];

    }else if(self.firstTB.text.length == 0){

        [self glowfirstTB:YES];

        [self glowsecondTB:NO];

    }else if(self.secondTB.text.length == 0){

        [self glowsecondTB:YES];

        [self glowfirstTB:NO];
    }


}

-(void)removeShadow{
    [self glowfirstTB:NO];
    [self glowsecondTB:NO];
}

-(void)glowfirstTB:(BOOL) shall_I_Glow{
    if(shall_I_Glow){
        self.firstTB.layer.masksToBounds = NO;
        self.firstTB.layer.shadowColor = [[UIColor blueColor] CGColor];
        self.firstTB.layer.shadowOffset = CGSizeZero;
        self.firstTB.layer.shadowRadius = 10.0f;
        self.firstTB.layer.shadowOpacity = 1.0;
    }else{
        self.firstTB.layer.shadowRadius = 0.0f;
        self.firstTB.layer.shadowOpacity = 0.0;
    }
}


-(void)glowsecondTB:(BOOL) shall_I_Glow{
    if(shall_I_Glow){
        self.secondTB.layer.masksToBounds = NO;
        self.secondTB.layer.shadowColor = [[UIColor blueColor] CGColor];
        self.secondTB.layer.shadowOffset = CGSizeZero;
        self.secondTB.layer.shadowRadius = 10.0f;
        self.secondTB.layer.shadowOpacity = 1.0;

        // [self.num setBorderStyle:UITextBorderStyleRoundedRect];
        // self.passwordTextField.layer.cornerRadius = 15.0;
    }else{
        self.secondTB.layer.shadowRadius = 0.0f;
        self.secondTB.layer.shadowOpacity = 0.0;
    }
}


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

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

@end

DerivedViewController.m（这里名为SearchPage.h）

#import "SearchPage.h"

@interface SearchPage ()

@property (weak, nonatomic) IBOutlet UITextField *searchText;

@end

@implementation SearchPage

- (IBAction)findButton:(id)sender {
   self.firstTB.text = @"hello";
   //Error message : Property 'firstTB' not found on object of type "SearchPage"
}


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

Answer 1

是的，您可以使用ViewController DerivedViewController中添加的相同文本框，为此，请在textbox场景中再添加一个DerivedViewController's并连接{ {1}} IBOutlet ViewController 's无需textbox以textbox为DerivedViewController创建新的来源，您可以继承textbook。

编辑1：

如果你是ViewController的子类，DerivedViewController子类中的所有插座连接都可用。例如，在DerivedViewController中只需从files owner拖动到您的视图组件，它就会显示超级视图（ViewController＆＃39; s）出口名称

编辑2：你正在声明私有属性，所以通过在.h文件中声明

使其可用于其他类

的 ViewController.h

#import <UIKit/UIKit.h> #import "ViewController.h> @interface DerivedViewController : ViewController @property (weak, nonatomic) IBOutlet UITextField *firstTB; @property (weak, nonatomic) IBOutlet UITextField *secondTB; @property (weak, nonatomic) IBOutlet UILabel *symbolLabel; @property (weak, nonatomic) IBOutlet UITextField *find; @end

<强> ViewController.m

#import "ViewController.h" @interface ViewController () @end @implementation ViewController int resultValue=0; - (IBAction)saveResult:(id)sender { //other codes } //other methods @end

Answer 2

您想从该文本框中重用什么？如果您只是想使用文本值，只需将其作为参数从BaseViewController传递给DerivedViewController。否则，您需要将UITextField子类化以在两个视图控制器上使用。

使用Storyboard从BaseViewController类继承按钮

2 个答案: