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IOS - linker error, duplicate character

It seems that I have an error while trying to compile, and it seems to point to two files directly: MenuViewController and FirstTopViewController. I think this has something to do with my import, as each one imports another, however the error refers to my Building object, which is almost never used in it. Also, with clang error, how to use -v to invoke the call?

Error:

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
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7 answers

At your request:

Remove all your classes from compilation sources, then click the + button and find the term ".m". Highlight each class and click Add. Build and run again.

+18
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Make sure you do not import the .m file, where it should be .h file. Doh!

+25
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I had a similar error when importing a third-party library with several * .a files into my IOS project. In my case, removing the -all_load-linker check box fixes the problem.

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Not sure, but there are a few things that might be.

  • I notice that no class imports Building.h, so my first thought is that the compiler does not know where to get the information for this class. Do you need to add #import?

  • The next step was that I try to avoid having two classes that import each other. The compiler may have problems trying to determine in which order to compile them. You may need to modify one of them to use @class ... rather than #import ... so that the compiler leaves it until the @class ... this class.

  • Finally, have you done clean? Several times when there is a lot of refactoring, old class definitions remain in the assembly directories and can cause such problems.

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Delete the file and select "Delete Link." Drag the file back into the project and everything will be fine. It worked for me.

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The problem that caused this for me was that I duplicated the m file but did not rename @implementation. Make sure you don't have duplicate @implementation ads.

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I ran into this problem because ICMGameDemo and CMGameSDK added this .m file to the compile sources panel, I drop ICMGameDemo and again ICMGameDemo problem that disappeared.

project settings screenshot

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Source: https://habr.com/ru/post/911713/

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