I have a simple function loading data from Firebase. func loadFromFireBase() -> Array<Song>? { var songArray:Array<Song> = [] ref.observe(.value, with: { snapshot in //Load song...

When I create a function, I can make a parameter optional by giving it a default value, like this: func foo(bar: String = "foobar") {} I want to do the same (make it optional) with a compl...

I'm trying to implement AlamofireObjectMapper (https://github.com/tristanhimmelman/AlamofireObjectMapper) with Alamofire 3 and latest version of ObjectMapper (https://github.com/Hearst-DD/ObjectMap...

In Firebase 2.5.1, this was working: let post1Ref = sendRequestRef.childByAutoId() post1Ref.setValue(request, withCompletionBlock: {( error:NSError?, ref:Firebase!) in }) However, I couldn't fi...

I'm trying to make a confirm deletion popup view. Because the design I want is very different from the style of the typical UIAlertView popup, I decided to create a custom ConfirmationViewControlle...

I'm using this library in my app for banners. I am trying to get the Link by parsing the JSON. The Images are are not showing in the slideshow view. If I press the slideshow view, after that ever...

I need to know when reloading a UICollectionView has completed in order to configure cells afterwards (because I am not the data source for the cells - other wise would have done it already...) I'...

I have checked many docs but could not found solution for Resuming tasks using NSURLSession when app removed from background or on device reboot. I am dealing with amazon S3 to upload some files,...

I'm using AVAssetWriter, and it is perfectly working on iOS6. The problem is, when I called finishWritingWithCompletionHandler, the completion handler is not called on iOS7 GM. I called markAsFi...

A UIView needs to change a warning label depending on the completion handler of a custom control: voucherInputView.completionHandler = {[weak self] (success: Bool) -> Void in self?.proceedBu...

I am trying to write a function that will execute an asynchronous GET request, and return the response (as any data type, but here it is as NSData). This question is based on: How to use NSURLConn...

I've been coding for iOS and I'm quite familiar with the concept of blocks in Objective-C. Now I'm leaning Java for Android and trying to convert some apps from Android to iOS. I read that there n...

I have been asking and trying to understand how completion handlers work. Ive used quite a few and I've read many tutorials. i will post the one I use here, but I want to be able to create my own w...

I want to send one string via airdrop, I want to call one function when the String is received on other device successfully. I had implemented it through UIActivityViewController and I check it via...

Im trying to understand completion handlers & blocks. I believe you can use blocks for many deep programming things without completion handlers, but I think i understand that completion handler...

I'm try to localize a start and end point to an address string, so that I can store it into NSUserDefaults. The problem is that the method continues executing and does not set my variable. NSLog(@...