Ios 未调用我的委托方法

我刚刚开始学习objective-c，我很惊讶为什么下面的协议和委托的简单代码不起作用，请澄清为什么委托方法没有被调用。提前谢谢

ViewController.h

#import <UIKit/UIKit.h>
#include "secondViewController.h"

@interface ViewController : UIViewController<ConverterDelegate>

@property (strong,nonatomic) secondViewController *secondview;

@property (strong, nonatomic) IBOutlet UILabel *msgtext;

@property (strong, nonatomic) IBOutlet UIButton *converbutton;

@end

#import <UIKit/UIKit.h>

@protocol ConverterDelegate <NSObject>
@required
-(void)convertToFahrenheit:(int)celsius;
@end

@interface secondViewController : UIViewController

@property (nonatomic, assign) id <ConverterDelegate> delegate;

@property (strong, nonatomic) IBOutlet UITextField *textfield;
- (IBAction)convert:(id)sender;

@end

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

@interface ViewController : UIViewController<CalculationDelegate>

@property (weak, nonatomic) IBOutlet UILabel *msgtext;
@property (weak,nonatomic) IBOutlet UITextField * inputField;
@property (weak, nonatomic) IBOutlet UIButton *converbutton;

-(IBAction)convertMetod:(id)sender;
@end

SecondViewController.h

#import <UIKit/UIKit.h>
#include "secondViewController.h"

@interface ViewController : UIViewController<ConverterDelegate>

@property (strong,nonatomic) secondViewController *secondview;

@property (strong, nonatomic) IBOutlet UILabel *msgtext;

@property (strong, nonatomic) IBOutlet UIButton *converbutton;

@end

#import <UIKit/UIKit.h>

@protocol ConverterDelegate <NSObject>
@required
-(void)convertToFahrenheit:(int)celsius;
@end

@interface secondViewController : UIViewController

@property (nonatomic, assign) id <ConverterDelegate> delegate;

@property (strong, nonatomic) IBOutlet UITextField *textfield;
- (IBAction)convert:(id)sender;

@end

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

@interface ViewController : UIViewController<CalculationDelegate>

@property (weak, nonatomic) IBOutlet UILabel *msgtext;
@property (weak,nonatomic) IBOutlet UITextField * inputField;
@property (weak, nonatomic) IBOutlet UIButton *converbutton;

-(IBAction)convertMetod:(id)sender;
@end

---

我完全搞不懂为什么我的委托方法没有被调用。我是目标c的新手，请帮助我。

我希望以下代码能够满足您的要求

ViewController.h

#import <UIKit/UIKit.h>
#include "secondViewController.h"

@interface ViewController : UIViewController<ConverterDelegate>

@property (strong,nonatomic) secondViewController *secondview;

@property (strong, nonatomic) IBOutlet UILabel *msgtext;

@property (strong, nonatomic) IBOutlet UIButton *converbutton;

@end

#import <UIKit/UIKit.h>

@protocol ConverterDelegate <NSObject>
@required
-(void)convertToFahrenheit:(int)celsius;
@end

@interface secondViewController : UIViewController

@property (nonatomic, assign) id <ConverterDelegate> delegate;

@property (strong, nonatomic) IBOutlet UITextField *textfield;
- (IBAction)convert:(id)sender;

@end

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

@interface ViewController : UIViewController<CalculationDelegate>

@property (weak, nonatomic) IBOutlet UILabel *msgtext;
@property (weak,nonatomic) IBOutlet UITextField * inputField;
@property (weak, nonatomic) IBOutlet UIButton *converbutton;

-(IBAction)convertMetod:(id)sender;
@end

计算h

 #import <Foundation/Foundation.h>
@protocol CalculationDelegate <NSObject>
@required
-(void) showTheAns:(NSString *) ans;
@end

@interface Calculation : NSObject
@property (strong,nonatomic) id <CalculationDelegate> delegate;
-(void)convertCelToFaher:(int)celsius;
@end

---

请参阅此链接，并解释您是如何进行测试的，尤其是如何显示2个不同的视图控制器…我有一个带有标签和按钮的第一个视图，当单击按钮时，它将通过模式segue移动到第二个视图。在第二个视图中，我有文本字段和一个按钮，当用户在文本字段中输入一些值并按下按钮时，第二个视图被取消，计算出的值应显示在第一个视图标签中。嗨，Wain，感谢您的及时响应，当我将以下代码添加到viewController.m时，它工作正常，但是为什么我们需要添加此代码-（void）prepareforsgue:（UIStoryboardSegue*）segue sender:（id）sender{secondViewController*addViewControler=[segue destinationViewController]；[addViewControler setDelegate:self]；}显然代码没有问题。