Question

在最后一行，我收到错误：Duplicate interface definition for class "ViewController".我想做一个IBAction。什么是错？我能做什么？请帮帮我。

//
//  ViewController.h


#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>
@interface SimpleEmailViewController : UIViewController <MFMailComposeViewControllerDelegate>
- (IBAction)showEmail:(id)sender;
@end
@interface ViewController : UIViewController <MFMessageComposeViewControllerDelegate> {

}
-(IBAction)sendMessage:(id)sender;
- (IBAction)showEmail:(id)sender;
@property (nonatomic, strong) IBOutlet UIWebView *site   ;
- (IBAction)call:(id)sender;
@property (retain, nonatomic) IBOutlet UIButton *myBotton;
@end
@interface ViewController : UIViewController**i**

Answer 1

问题正是错误所指出的。您定义了@interface viewController两次。将其名称更改为其他名称。作为旁注，用名称apple已经使用的名称命名是一个可怕的想法。您应该将viewController更改为其他内容，更具描述性，例如mailViewController或setupViewController。使用Apple定义的名称时可能会发生奇怪的事情。

@interface FSMainiPadViewController : UIViewController

Answer 2

为什么不像这样简单？

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

@interface ViewController : UIViewController <MFMailComposeViewControllerDelegate, MFMessageComposeViewControllerDelegate>
   // Actions
   - (IBAction)showEmail:(id)sender;
   - (IBAction)sendMessage:(id)sender;
   - (IBAction)call:(id)sender;

   // Properties
   @property (nonatomic, strong) IBOutlet UIWebView *site;
   @property (retain, nonatomic) IBOutlet UIButton *myBotton;
@end

类＆＃34; ViewController＆＃34;的重复接口定义

2 个答案: