缺少方法聲明的上下文嗎？

Question

我想創建一個應用程序，當我添加這個IBAction，它給了我錯誤方法聲明的上下文缺少。我已經查找了如何解決這個問題，但是因爲我是初學者，所以我有點困惑。這些錯誤出現在我的.m文件中：

#import "QRscannerSecondViewController.h" 

@end 

@interface QRscannerSecondViewController() 

@end 

@implementation QRscannerSecondViewController 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
if (self) { 
    self.title = NSLocalizedString(@"Info", @"Info"); 
    self.tabBarItem.image = [UIImage imageNamed:@"second"]; 
} 
return self; 
} 


- (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 

-(IBAction)button1 
{ 
[input resignFirstResponder]; 
l11 = input.text; 
line11.text = [[NSString alloc] initWithFormat:@"%2.f", l11]; 
} 

但我認爲如果我將.h文件也包含在內，它會有所幫助。

#import <UIKit/UIKit.h> 

@interface QRscannerSecondViewController : UIViewController 

@end 

@interface TextGameViewController : UIViewController 
{ 
IBOutlet UITextField *input; 
IBOutlet UILabel *line11; 
NSString *l11; 
} 
-(IBAction)button1; 

Answer 1

你需要把代碼：

-(IBAction)button1 
{ 
[input resignFirstResponder]; 
l11 = input.text; 
line11.text = [[NSString alloc] initWithFormat:@"%2.f", l11]; 
} 

的@end之前。