adriantofan

//http://ronnqvi.st/array-intersections-and-differences

NSPredicate *intersectPredicate = 
    [NSPredicate predicateWithFormat:@"SELF IN %@", otherArray];
NSArray *intersect = 
    [firstArray filteredArrayUsingPredicate:intersectPredicate];

NSPredicate *relativeComplementPredicate =  // a minus b
    [NSPredicate predicateWithFormat:@"NOT SELF IN %@", otherArray];
NSArray *relativeComplement = 

adriantofan

  self.tableView.estimatedRowHeight = 44.0;
  self.tableView.rowHeight = UITableViewAutomaticDimension;
// 
  cell.textLabel.numberOfLines = 0;

adriantofan

  for(NSString *fontfamilyname in [UIFont familyNames])
  {
    if (![fontfamilyname containsString:@"elvetica"]) {
      continue;
    }
      NSLog(@"family:'%@'",fontfamilyname);
      for(NSString *fontName in [UIFont fontNamesForFamilyName:fontfamilyname])
      {
          NSLog(@"\tfont:'%@'",fontName);
      }

adriantofan

no separators for empty cells
tableView.tableFooterView = UIView(frame: CGRectZero)

//http://stackoverflow.com/questions/25770119/ios-8-uitableview-separator-inset-0-not-working

// From End To end
    cell.separatorInset =  UIEdgeInsetsZero;
    cell.layoutMargins = UIEdgeInsetsZero;
    cell.preservesSuperviewLayoutMargins = NO;
// invisible

adriantofan

[self addChildViewController:vc];
// [vc willMoveToParentViewController:self] called automatically
[self.view addSubview:vc.view]; // or something like this.
[vc didMoveToParentViewController:self];
// For removing view controllers:

[vc willMoveToParentViewController:nil];
[vc.view removeFromSuperview]; // or something like this
[vc removeFromParentViewController];

adriantofan

  
NSLocale *locale = [NSLocale currentLocale];
// [locale localeIdentifier]  fr_FR (i'm in france)
NSLog(@"current locale: %@", locale.localeIdentifier);

NSArray* preferredLanguages = [NSLocale preferredLanguages];
NSLog(@"preferredLanguages: %@", preferredLanguages);
// en,fr ( the interface is in english )
  
NSString* code = [locale objectForKey:NSLocaleCurrencyCode];