语义问题 - 不完整的实现Xcode

Question

我在线搜索并通过我的代码，我无法弄清楚我的问题在哪里。如果有人可以帮助我，我会非常感激。

SecondViewController.h

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

@interface SecondViewController : UIViewController <MFMailComposeViewControllerDelegate>
{}

-(IBAction)twitter:(id)sender;
-(IBAction)facebook:(id)sender;
-(IBAction)Contact:(id)sender;

@end

SecondViewController.m

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController



- (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.
}


-(IBAction)Contact {
    MFMailComposeViewController *mailcontroller = [[MFMailComposeViewController alloc] init];
    [mailcontroller setMailComposeDelegate:self];
    NSString *email =@"Warce@actionsportsinc.com";
    NSArray *emailArray = [[NSArray alloc] initWithObjects:email, nil];
    [mailcontroller setToRecipients:emailArray];
    [mailcontroller setSubject:@"Enter Subject Here"];
    [self presentViewController:mailcontroller animated:YES completion:nil]; }

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error{ [self dismissViewControllerAnimated:YES completion:nil];
}

@end

我对iPhone的编程很新。所以，请原谅我没有完全理解这个问题。

Answer 1

Xcode会告诉你你缺少什么。选择查看＆gt;导航器＆gt;显示问题导航器，然后关闭所有显示三角形：

请注意，您声明了一个名为Contact:的方法，但您实现了一个名为Contact的方法。冒号是方法名称的一部分。你不能省略它。