9 Notes for me in November Swift 4.1

Note:  November-2018

1. Selection color for selected in tableView and collectView

 -- " cell.selectionStyle = UITableViewCellSelectionStyle.none "

 --  that code can change color if you select table view too like

 -- "  cell.selectionStyle = UITableViewCellSelectionStyle.blue ", ".red / .gray " .etc


2. Or in .xib/.nib setting selection color for selected in tableView and collectView.

--   
--  Change selection from default to none.

--  


3. For Update Carthage fast use cache.

-- $ carthage update --cache-builds --platform iOS
-- or 
-- $ carthage update  --platform iOS --cache-builds


4. Use navigation barbutton
-- Error: button bar cannot change color

-- Don't
--

--Do
--

5.  Code "Swift" for Thumbnail video

  func createThumbnailOfVideoFromRemoteUrl(url: URL) -> UIImage? {
         let asset = AVAsset(url: url)
         let assetImgGenerate = AVAssetImageGenerator(asset: asset)
         assetImgGenerate.appliesPreferredTrackTransform = true
         let time = CMTimeMakeWithSeconds(1.0, 600)
         do {
             let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
             let thumbnail = UIImage(cgImage: img)
             return thumbnail
         } catch {
             print(error.localizedDescription)
             return nil
        }
     }

-- Note: for url from Api and local storage, if u want URL video from local storage, must get data from -- gallery  .photolibrary --> video after didfinish and check URL .

--  example :
--- local: file:///var/mobile/Media/DCIM/100APPLE/IMG_0028.MOV 
--- web / Api / cloud = https://img.google.com/video/Video_20181031_c2smyp.mp4


6. Count / limit character UITextView 

-- How to use, component is UITextView, UILabel and use shouldChangeTextIn
-- example: limit character < 300.

  public func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {

        let newText = (questionTextView.text as NSString).replacingCharacters(in: range, with: text)
        let numberOfChars = newText.count
        self.questionCountLabel.text = "\(300 - newText.count)" // questionCountLabel -> label show
        return numberOfChars < 300

    }

-- Note: for UITextField use shouldChangeCharactersIn 


7. Simple Video Player use  AVPlayerViewController

-- Remember to import AVKit, import AVFoundation, AVFoundation framework is needed even if you use AVPlayer

import UIKit
import AVKit
import AVFoundation

@IBAction func handleVideoPlayerr(_ sender: UIButton) {

      let  videoURL = "your_Url_Video"
     
        let player = AVPlayer(url: videoURL)
            let vc = AVPlayerViewController()
            vc.player = player
            
            present(vc, animated: true) {
                vc.player?.play()
            }    

8. Count / limit Character For UITextField

-- This for UITextField use shouldChangeCharactersIn 


func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let newLength = (textField.text?.utf16.count)! + string.utf16.count - range.length
        if newLength <= 16 {
            countLabel.text = "\(16 - newLength)"
            
            return true
        } else {
            return false
        }

    }
-- Full custom text field File



9.  Condition if UIScrollView in bottom ?

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let  height = scrollView.frame.size.height
    let contentYoffset = scrollView.contentOffset.y
    let distanceFromBottom = scrollView.contentSize.height - contentYoffset
    if distanceFromBottom < height {
        print(" you reached end of the table")
    }
}