Hi Brian, when upload you the next videos:)?best regards

Hi Brian, Will you also show how to work with videos ? Thanks.

Hi Brian, Instead of viewDidLoad on the HomeController is it not better to use viewWillAppear? Best regards

I noticed that we need the following to hide the status bar in HomeController like we have done in other controllers override var prefersStatusBarHidden: Bool { return true }

You are awwesome!

Brian after instangram can you show us how to build spotify please

Hi Brian, Can you show us also how to paginate the Home Feed with Firebase and use pull to refresh at the top of the screen to get the latest posts please

Hi Brian, Why are you using an UICollectionView instead of an UITableView for the HomeFeed ? The home feed has one column. I thought using a collectionView makes sense when you have more than one column. Could you also use a Uicollectionview inside of a tableview ? Im a little bit confused and would like to know when to use which controller. Thanks

it is weird you keep saying these properties should be defaulted but you didn't add them to our CustomImageView

I keep getting a red screen for HomeController. The yellow colored cells are not showing up I even copied your exact code into X code and it is still not working. Please help.

Hey Brian I am wondering why you don't add the content to the collection view cells inside their contentView property. Is there any particular reason you just add the subviews to the cell view itself?

can't wait for pagination :)

Brian - Why do you set UICollectionViewDelegateFlowLayout as a protocol vs extending HomeController? I've seen it done both ways, but never heard much of an explanation as to why.

this method is invoked right before the tableview reuseable cell is returned, so can i use it for my table view cell to remove the photo that cell has scrolled away, so the corrected new image can load to renew cell, to prevent that wrong photo load to the text content if user scroll up and down so fast. can anyone tell me if this is ok or redundant to use it? or there is other way to do it ? (i use sd_webimage to load the images for my tableview ) thanks very much. override func prepareForReuse() { super.prepareForreuse() mypostImage.image = nil }

I'm using YapImageManager which does the caching automatically. It uses a SQL lite DB under the covers so the images persist on app startup as long as they haven't expired. They support CocoaPods so it easy to install. Love the course.

hey Brian, Thanks for the course, I'm developing a similar application, but the fee layout is only as instagram stories present full post may be image or video, I solved with a collectionView and load the images or video with alamofire and works well, however I need start to fill the progress bar when the post already was loaded not before when Cell is visible and waiting for download, each cell take his respective time if is photo 10 seconds, if is video time of the video, I hope same way as instagram, change to next CELL when time is finish (progress bar is full), and begin the same again. I use the notification center to notify that images is download but is async work so not always the notification correspond to the current CELL, hence start to fill the progressbar and the current cell not finished to load, beacuse post the notification that already downloaded one image of other cell (almost the next cell) , this make that the current cell start his progress bar and change to next cell, and dont display the current post or a bit of real time if load when progressbar started. Recently I found IGListKIt, but is not clear to me the implmentation and if could help to me, I hope be clear with the problem, thanks in advance.

hey. Brian, how can i implement cached image via URLCache, I've tried to do this but here is what I got error code Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSURLCache 0x600000011850> valueForUndefinedKey:]: this class is not key value coding-compliant for the key https://firebasestorage.googleapis.com/v0/b/instragramfirebase-66bba.appspot.com/o/posts%2F13D17DF1-D785-4C99-A577-904A150C933A?alt=media&token=1d21a8db-c76d-415c-bff6-1da79e9802ef.' I follow https://stackoverflow.com/questions/32577207/caching-images-in-collectionviewcell-in-swift/41872124#41872124, and still get confused how to use this class

Hi,Brian, 你好！ 我在做自己的app准备作为第一个自己的完整项目当作结业项目，因为图片太多，全都存在Xcode中编译速度特别慢，所以我就直接在Firebase的Storage里上传了全部图片，希望在app中获取到并且显示出来，我想通过文件名称获得指定的图片，你在课程里用的是图片的URL获取，不知道用图片文件名应该怎么去封装一个function。你能帮帮我吗？目前封装的代码是这样的，应该怎么改？ let imageCache = NSCache<AnyObject, AnyObject>() extension UIImageView { func loadImageUsingCacheWithUrlString(urlString: String) { if let cachedImage = imageCache.object(forKey: urlString as AnyObject) as? UIImage { self.image = cachedImage return } let url = NSURL(string: urlString) URLSession.shared.dataTask(with: url! as URL, completionHandler: { (data, response, error) in if error != nil { print(error ?? "There is an Error.") return } DispatchQueue.main.async { if let downloadedImage = UIImage(data: data!) { imageCache.setObject(downloadedImage, forKey: urlString as AnyObject) self.image = downloadedImage }

The best way of Image cache :-) :-)

To anyone struggling with proper post order on the home screen, here's a solution: Dictionaries by their nature are unordered, so as soon as the snapshot's value is converted to a dictionary its order is lost. The below creates an array of keys from the snapshot dictionary, sorts them, and then adds the dictionaries to the posts array in the order they appear in the keys array. fileprivate func fetchPosts() { guard let uid = Auth.auth().currentUser?.uid else { return } let userPostsDatabaseReference = Database.database().reference().child("posts").child(uid) userPostsDatabaseReference.observeSingleEvent(of: .value, with: { (dataSnapshot) in guard let snapshotDictionary = dataSnapshot.value as? [String: Any] else { return } var snapshotKeys = [String]() for key in snapshotDictionary.keys { snapshotKeys.append(key) } snapshotKeys.sort() for snapshotKey in snapshotKeys { guard let postDictionary = snapshotDictionary[snapshotKey] as? [String: Any] else { return } let post = Post(postDictionary: postDictionary) self.posts.insert(post, at: 0) } self.collectionView?.reloadData() }) { (error) in print(error.localizedDescription) } }

Hello Community Can some one explain the use SELF in this line of code : collectionView?.register(UICollectionViewCell.SELF, forCellWithReuseIdentifier: cellId)

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return posts.count //return 5 } posts.count is not returining anything.

Hi Brian, Thank you for your course. It is very pleasant and very helpful. I'm trying to put multiple images in the home cell like in instagram. I'm using a CollectionView but I have an issue. I can't see the first image. Everything works fine because I also use it in the userProfile and I use exactly the same file for cell. It's just in the Home menu that I can't see the first image. I can see it only if I scroll too far on the right. Thank you in advance for your help.

Hi Brian, I really need your help I'm building my own project but encountering a problem. I'm currently using NSAttributedString to store posts that has image and texts combined. (Images inside texts) Is there a better way to achieve this? I realize that I can not access the image(tap to view) inside the AttributedString. What can I do? How should I structure my app?

Hi Brian. I am considering purchasing the lesson video now. Because I am not watching your lesson video, I want to ask you a question. Is there a function to delete a user's post in this lesson video? Also, do you use SDWebImage in this lesson video?

Hi Brian I accidentally added image cache array inside the CustomImageView class and image cache doesn't seem to work, btw. I needed to add self in front of the array but when I put array outside the class as you did caching worked out. How that "self" and array inside the class changes operation of caching?

Biran I really look forward, going through this course on my vacation next week!

Hi Brian, excellent course. I need to create a video player in addition to the image view. I've tried multiple pods, but i cant achieve this requirement.

HI Brian, I am trying to build a chat app with an approach of keeping a local coredata db and syncing it with the firebase database. I purchased this video for the reference. But i can see that you are directly working against the firebase db. Can you please suggest a way to keep a local db, other than the offline feature of firebase? I just dont feel the firebase offline feature that manageable. Thanks, Russel

Hi Brain, What should I write if I want to fetch specific users' posts instead of the users I followed? Thanks.

Hi Brain, I get an error when I go from the user profile tab to the home feed this is what it tells me: Will attempt to recover by breaking constraint <NSLayoutConstraint:0x600003241e00 'UISV-canvas-connection' UIStackView:0x7fdffe4a9810.top == UIButton:0x7fdffe4a7ff0.top (active)> Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. Then the posts in the home feed become like user profile page but not all of them I can share screenshots with you if you want. Thanks.

Hi Brain, I'm so happy with the course. I learned a lot from you and I was never able to enjoy coding but thanks to you know everything is so awesome. My app is working good the only small bug I can't fix is how to stop the calling twice of fetchPostWithUsers. In the console prints 13 times the "loading image", when I only have 4 posts from user and followers. Any suggestion how to fix the bug or maybe clean the code? Thank you!

Hi Brain! I can't switching between the icons on tabbar from home to profile logo. Can't find an issue. I recheck the code in MainTabbarController and everything is match with your code. Please help me

Hi Brian, Your course is awesome and I am enjoying it a lot I have a problem, In the home feed I am having my images to flicker and change while scrolling through collectionView. Can you help me with that? Thanks