ios-starter/objc-starter/AppQualityObjC/AQViewController.m [18:35]:
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@import Firebase;

@interface AQViewController ()
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@end

@implementation AQViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  NSArray *paths = NSSearchPathForDirectoriesInDomains
  (NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = paths[0];

  //make a file name to write the data to using the documents directory
  NSString *fileName = [NSString stringWithFormat:@"%@/perfsamplelog.txt",
                        documentsDirectory];
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ios/objc/AppQualityObjC/AQViewController.m [18:35]:
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@import Firebase;

@interface AQViewController ()
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@end

@implementation AQViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  NSArray *paths = NSSearchPathForDirectoriesInDomains
  (NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = paths[0];

  //make a file name to write the data to using the documents directory
  NSString *fileName = [NSString stringWithFormat:@"%@/perfsamplelog.txt",
                        documentsDirectory];
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