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//this takes a list of items in an array, then runs an observable on each of them, finally it combines
//all of the outputs into one observable which returns all of the media items at once

Observable.combineLatest(mediaItems.map({ $0.getMediaMetadataObservable() })).subscribe(onNext: { a in
      for item in a {
        print (item.type)
      }
})

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func collectionView(_ collectionView: UICollectionView, heightForAnnotationAtIndexPath indexPath: IndexPath, withWidth width: CGFloat) -> CGFloat {
   
  
    let x = dataSource?[indexPath]
    let font = UIFont(name: "OpenSans", size: 11)!

    let rect = NSString(string: x?.brief ?? "").boundingRect(with: CGSize(width: width, height: CGFloat(MAXFLOAT)), options: .usesLineFragmentOrigin, attributes: [NSFontAttributeName: font], context: nil)
    
    // if multiple types
    

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 // force blinking the cursor
 self!.inputTextField.inputView = UIView()
 self!.inputTextField.becomeFirstResponder()

//re-enable for when user actually clicks
inputTextField.rx.controlEvent(.touchDown).subscribe(onNext: { [weak self] _ in
      guard let _ = self else { return }
      self!.inputTextField.inputView = nil
      self!.inputTextField.reloadInputViews()
    }).addDisposableTo(rx_disposeBag)

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// there are cases where you just need to update the display and not the data
// for example if you change the constants on a constraint

self!.tableView?.beginUpdates()
self!.tableView?.endUpdates()

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let index = updates.index(where: {$0.id == self.prototypeUpdate?.id})

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Fixes for animation tutorial

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{ [weak self] (_) in
  guard let _ = self else { return }
  self!.
}

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// MAKE SURE YOU HAVE TOP TO BOTTOM CONSTRAINTS SET ON ALL OF THE OBJECTS IN THE HEADER VIEW!!!

// better as an extension
func sizeHeaderToFit() {
    
    if let tableViewHeader = self.tableHeaderView {
      let headerView = tableViewHeader
      
      headerView.setNeedsLayout()
      headerView.layoutIfNeeded()

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//section model file

import RxDataSources

enum CommentTableSectionModel {
  case section(comment: Comment, items: [CommentTableSectionModelItem])
}

extension CommentTableSectionModel: SectionModelType {

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extension UIView {

class func loadFromNibNamed(nibNamed: String, bundle : Bundle? = nil) -> UIView? {
    return UINib(
      nibName: nibNamed,
      bundle: bundle
      ).instantiate(withOwner: nil, options: nil)[0] as? UIView
  }
  
}