iOS - Errore linker, simbolo duplicato

Question

Sembra che si stia verificando un errore durante il tentativo di compilazione e sembra che punti direttamente a due file..MenuViewController e FirstTopViewController. Penso che abbia qualcosa a che fare con le mie importazioni, dato che ognuna di esse sta importando l'altra, ma l'errore sta facendo riferimento al mio oggetto Building, che viene usato a malapena. Inoltre, con l'errore clang, come posso usare -v per vedere l'invocazione?

Errore:

ld: duplicate symbol _OBJC_CLASS_$_Building in /Users/alexmuller/Library/Developer/Xcode/DerivedData/ECSlidingViewController-gjxwxiwumgohyehiawnlamggzmop/Build/Intermediates/ECSlidingViewController.build/Debug-iphonesimulator/ECSlidingViewController.build/Objects-normal/i386/FirstTopViewController.o and /Users/alexmuller/Library/Developer/Xcode/DerivedData/ECSlidingViewController-gjxwxiwumgohyehiawnlamggzmop/Build/Intermediates/ECSlidingViewController.build/Debug-iphonesimulator/ECSlidingViewController.build/Objects-normal/i386/MenuViewController.o for architecture i386 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 

FirstTopViewController.h

#import <UIKit/UIKit.h> 
#import <QuartzCore/QuartzCore.h> 
#import "ECSlidingViewController.h" 
#import "MenuViewController.h" 
#import "TimesViewController.h" 
#import "BuildingViewController.h" 
#import "BuildingAnnotation.h" 
#import <MapKit/MapKit.h> 

@class BuildingViewController; 

@interface FirstTopViewController : UIViewController <MKMapViewDelegate> { 
    IBOutlet MKMapView *_map; 
    BuildingViewController *buildingVC; 
    BuildingAnnotation *buildAnnotation; 
} 

@property (nonatomic, strong) MKMapView *map; 

- (IBAction)revealMenu:(id)sender; 
- (IBAction)revealTimes:(id)sender; 
- (void)loadBuilding:(Building *)building; 

@end 

FirstTopViewController.m

#import "FirstTopViewController.h" 

@implementation FirstTopViewController 

@synthesize map = _map; 

- (void)viewDidLoad { 

    buildingVC = (BuildingViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"BuildingList"]; 
    [super viewDidLoad]; 
} 

- (void)viewWillAppear:(BOOL)animated 
{ 
    [(UIView *)[self.view viewWithTag:10] setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"RedWithNoise"]]]; 
    [super viewWillAppear:animated]; 
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"toolbar"] forBarMetrics:UIBarMetricsDefault]; 
    [[UINavigationBar appearance] setTitleTextAttributes: 
    [NSDictionary dictionaryWithObjectsAndKeys: 
     [UIColor colorWithRed:204.0/255.0 green:204.0/255.0 blue:102.0/255.0 alpha:1.0], 
     UITextAttributeTextColor, 
     [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8], 
     UITextAttributeTextShadowColor, 
     [NSValue valueWithUIOffset:UIOffsetMake(0, -1)], 
     UITextAttributeTextShadowOffset, 
     [UIFont fontWithName:@"AGaramondPro-Regular" size:23.0], 
     UITextAttributeFont, 
     nil]]; 
    self.view.layer.shadowOffset = CGSizeZero; 
    self.view.layer.shadowOpacity = 0.75f; 
    self.view.layer.shadowRadius = 10.0f; 
    self.view.layer.shadowColor = [UIColor blackColor].CGColor; 
    self.view.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.view.layer.bounds].CGPath; 
    self.view.clipsToBounds = NO; 

    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(CLLocationCoordinate2DMake(30.451667, -84.268533), 16090.344, 16090.344); 
    viewRegion = [_map regionThatFits:viewRegion]; 
    [_map setRegion:viewRegion animated:YES]; 

    if (![self.slidingViewController.underLeftViewController isKindOfClass:[MenuViewController class]]) { 
     self.slidingViewController.underLeftViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Menu"]; 
    } 

    if (![self.slidingViewController.underRightViewController isKindOfClass:[TimesViewController class]]) { 
     self.slidingViewController.underRightViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Times"]; 
    } 

    [self.view addGestureRecognizer:self.slidingViewController.panGesture]; 


} 

- (void)loadBuilding:(Building *)building { 
    if (buildingVC.buildingSelected) { 
     if (buildAnnotation != nil) { 
      [_map removeAnnotation:buildAnnotation]; 
     } 
     NSLog(@"%@", building.getName); 
     buildAnnotation = [[BuildingAnnotation alloc] initWithCoordinate:building.getLocation.coordinate withName:building.getName withAddress:building.getAddress]; 
     [_map setCenterCoordinate:buildAnnotation.coordinate animated:YES]; 
     [_map addAnnotation:buildAnnotation]; 
    } 
} 

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 
{ 
    self.view.layer.shadowPath = nil; 
    self.view.layer.shouldRasterize = YES; 
} 

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 
{ 
    self.view.layer.shadowPath = [UIBezierPath bezierPathWithRect:self.view.layer.bounds].CGPath; 
    self.view.layer.shouldRasterize = NO; 
} 

- (IBAction)revealMenu:(id)sender 
{ 
    [self.slidingViewController anchorTopViewTo:ECRight]; 
} 

- (IBAction)revealTimes:(id)sender { 
    [self.slidingViewController anchorTopViewTo:ECLeft]; 
} 

@end 

MenuViewController.h

#import <UIKit/UIKit.h> 
#import "ECSlidingViewController.h" 
#import "FirstTopViewController.h" 
#import "TimesViewController.h" 

@interface MenuViewController : UIViewController <UITableViewDataSource, UITabBarControllerDelegate> { 
    NSIndexPath *selectedIndex; 
} 

@end 

MenuViewController.m

#import "MenuViewController.h" 

typedef enum { 
    ENGINEERING, 
    GARNET, 
    GOLD, 
    HERITAGE, 
    NIGHT, 
    OSCEOLA, 
    RENEGADE, 
    TOMAHAWK 
} RouteName; 


@interface MenuViewController() 
@property (nonatomic, strong) NSArray *menuItems; 
@property (nonatomic, strong) NSArray *optionItems; 
@property (nonatomic, strong) NSArray *arrayItems; 

- (UIImage *)determineActiveRoute:(RouteName)route; 
@end 

@implementation MenuViewController 
@synthesize menuItems, optionItems, arrayItems; 

- (void)awakeFromNib 
{ 

    self.menuItems = [NSArray arrayWithObjects:@"Engineering", @"Garnet", @"Gold", @"Heritage Grove", @"Night Nole", @"Osceola", @"Renegade", @"Tomahawk", nil]; 
    self.optionItems = [NSArray arrayWithObjects:@"Buildings", @"Directions", nil]; 
    self.arrayItems = [NSArray arrayWithObjects:self.menuItems, self.optionItems, nil]; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    [self.slidingViewController setAnchorRightRevealAmount:200.0f]; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)sectionIndex 
{ 
    return [[self.arrayItems objectAtIndex:sectionIndex] count]; 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return [self.arrayItems count]; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { 
    return 35; 
} 

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { 
    UIView *sectionView = [[UIView alloc] init]; 
    [sectionView sizeToFit]; 
    sectionView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"navCellDivider"]]; 
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 100, 20)]; 
    label.textColor = [UIColor grayColor]; 
    label.backgroundColor = [UIColor clearColor]; 
    label.font = [UIFont fontWithName:@"AGaramondPro-Regular" size:12.0]; 
    if(section == 0) 
     label.text = @"BUS ROUTES"; 
    else 
     label.text = @"OTHER OPTIONS"; 
    [sectionView addSubview:label]; 
    return sectionView; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section { 
    return 20; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    UILabel *label; 
    UIImageView *imageView; 
    NSString *cellIdentifier = @"MenuItemCell"; 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier]; 
    if (cell == nil) { 
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]; 

    } 
    UIView *selectedView = [[UIView alloc] initWithFrame:cell.frame]; 
    selectedView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"navCellBackgroundSelected"]]; 
    cell.selectedBackgroundView = selectedView; 
    cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"navCellBackground"]]; 
    label = (UILabel *)[cell.contentView viewWithTag:100]; 
    label.font = [UIFont fontWithName:@"AGaramondPro-Regular" size:15.0]; 
    label.text = [[self.arrayItems objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]; 
    imageView = (UIImageView *)[cell.contentView viewWithTag:101]; 
    if (indexPath.section == 0) { 
     [imageView setImage:[self determineActiveRoute:indexPath.row]]; 
    } else { 
     if (indexPath.row == 0) { 
      [imageView setImage:[UIImage imageNamed:@"building"]]; 
     } else { 
      [imageView setImage:[UIImage imageNamed:@"60-signpost"]]; 
     } 
    } 

    return cell; 
} 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    /* Type cast view as a First Top to make it easier to read. Do switch to select correct route, 
     then modify map afterwards to load up correct route. 
    TimesViewController can be set to the corresponding times when selected 
    */ 
    FirstTopViewController *mapViewController = (FirstTopViewController *)self.slidingViewController.topViewController; 
    TimesViewController *timesViewController = (TimesViewController *)self.slidingViewController.underRightViewController; 

    if (indexPath.section == 0) { 
     selectedIndex = indexPath; 
     switch (indexPath.row) { 
      case ENGINEERING: 
       NSLog(@"Engineering Selected\n"); 
       timesViewController.times.text = @"Engineering"; 
       break; 
      case GARNET: 
       NSLog(@"Garnet Selected\n"); 
       timesViewController.times.text = @"Garnet"; 
       break; 
      case GOLD: 
       NSLog(@"Gold Selected\n"); 
       timesViewController.times.text = @"Gold"; 
       break; 
      case HERITAGE: 
       NSLog(@"Heritage Grove Selected\n"); 
       timesViewController.times.text = @"Heritage Grove"; 
       break; 
      case NIGHT: 
       NSLog(@"Night Nole Selected\n"); 
       timesViewController.times.text = @"Night Nole"; 
       break; 
      case OSCEOLA: 
       NSLog(@"Osceola Selected\n"); 
       timesViewController.times.text = @"Osceola"; 
       break; 
      case RENEGADE: 
       NSLog(@"Renegade Selected\n"); 
       timesViewController.times.text = @"Renegade"; 
       break; 
      case TOMAHAWK: 
       NSLog(@"Tomahawk Selected\n"); 
       timesViewController.times.text = @"Tomahawk"; 
       break; 
      default: 
       break; 
     } 
    } else { 
     if (indexPath.row == 0) { 
      BuildingViewController *buildings = [self.storyboard instantiateViewControllerWithIdentifier:@"BuildingList"]; 
      buildings.userLoc = [[CLLocation alloc] initWithLatitude:mapViewController.map.userLocation.coordinate.latitude longitude:mapViewController.map.userLocation.coordinate.longitude]; 

      [self presentModalViewController:buildings animated:YES]; 
     } 
     [tableView deselectRowAtIndexPath:indexPath animated:NO]; 
     [tableView selectRowAtIndexPath:selectedIndex animated:YES scrollPosition:UITableViewScrollPositionNone]; 
    } 
    [self.slidingViewController anchorTopViewTo:ECRight animations:nil onComplete:^{ 
     [self.slidingViewController resetTopView]; 
    }]; 
} 

- (UIImage *)determineActiveRoute:(RouteName)route { 
    NSCalendar *gregorianCalender = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSDateComponents *components = [gregorianCalender components:NSHourCalendarUnit fromDate:[NSDate date]]; 
    switch (route) { 
     case ENGINEERING: 
      if ([components day] % 7 == 2) { 
       if (([components hour] >= 7) && ([components hour] < 17)) { 
        return [UIImage imageNamed:@"green"]; 
       } else { 
        return [UIImage imageNamed:@"red"]; 
       } 
      } else if (([components day] % 7 == 3) || ([components day] % 7 == 4)) { 
       return [UIImage imageNamed:@"red"]; 
      } else { 
       //Weekday 
       if (([components hour] >= 7) && ([components hour] < 19)) { 
        return [UIImage imageNamed:@"green"]; 
       } else { 
        return [UIImage imageNamed:@"red"]; 
       } 
      } 
      break; 
     case GARNET: 
     case GOLD: 
     case HERITAGE: 
      if ((([components day] % 7 <= 3) || ([components day] % 7 >= 5)) && 
       (([components hour] >= 7) && ([components hour] <= 19))) { 
       return [UIImage imageNamed:@"green"]; 
      } else { 
       return [UIImage imageNamed:@"red"]; 
      } 
      break; 
     case NIGHT: 
      if ((([components day] % 7 == 6) || ([components day] % 7 <= 3)) && 
       (([components hour] >= 22.5) || ([components hour] <= 3))) { 
       return [UIImage imageNamed:@"green"]; 
      } else { 
       return [UIImage imageNamed:@"red"]; 
      } 
      break; 
     case OSCEOLA: 
     case RENEGADE: 
     case TOMAHAWK: 
      if ((([components day] % 7 <= 3) || ([components day] % 7 >= 5)) && 
       (([components hour] >= 7) && ([components hour] <= 19))) { 
       return [UIImage imageNamed:@"green"]; 
      } else { 
       return [UIImage imageNamed:@"red"]; 
      } 
      break; 
    } 
} 

@end 

Answer 1

secondo la vostra richiesta:

Rimuovere tutte le classi provenienti da fonti di compilazione, quindi fare clic sul pulsante + e cercare il termine '.m'. Evidenzia ogni classe, quindi fai clic su aggiungi. Costruisci e corri di nuovo.

Answer 2

Non sono sicuro, ma ci sono un paio di cose che potrebbe essere.

1. mi accorgo che né classe sembra importare Building.h quindi il mio primo pensiero è che il compilatore non sa dove trovare le informazioni per questa classe. Hai bisogno di aggiungere un #import?

2. La cosa successiva è che in genere cerco di evitare due classi che si importano a vicenda. La compilazione potrebbe avere problemi nel cercare di capire quale ordine compilarli. Potrebbe essere necessario modificarne uno per usare @class ... anziché #import ... in modo che il compilatore lo lasci fino al runtime per risolvere la classe.

3. Finalmente hai pulito? Alcune volte durante il refactoring molto, le vecchie definizioni di classe vengono lasciate nelle directory di compilazione e possono causare problemi come questo.

Answer 3

Verificare di non aver importato il file .m in cui dovrebbe essere il file .h. Doh!

Answer 4

Eliminare il file e scegliere "Rimuovi riferimento". Trascina nuovamente il file nel progetto e dovrebbe essere ok. Questo ha funzionato per me.

Answer 5

Il problema che mi causava questo problema era che avevo duplicato un file m, ma non rinominato l'@implementation. Assicurati di non avere dichiarazioni di implementazione @ duplicate.

Answer 6

Ho riscontrato un errore simile durante l'importazione di una libreria di terze parti con più file * .a nel mio progetto IOS. Nel mio caso la rimozione del flag link "-all_load" ha risolto il problema.