closures

I am writing an iOS app that requires the device's GPS loction to be updated when a push notification is received. I use a closure to get the current GPS location. This code runs perfectly when the app is in the foreground (Both "New remote notification" and "Got location" is printed to console), but when the app is in the background, only "New remote notification" (and no location error) is printed to console. As a result I don't have the GPS location of the device at this point, which is very important for my app's functionality. Any help would be greatly appreciated. Thanks. I have in my

As I read through the UIKit , most of the time I see closures (as a function parameter) with missing argument labels like this: func fooClosure(fooClosure: (Bool) -> Swift.Void) In some cases I can guess what it stands for, in others I can't. Example: Take a look at one of UIActivityViewController 's closure (as a type alias): public typealias UIActivityViewControllerCompletionWithItemsHandler = (UIActivityType?, Bool, [Any]?, Error?) -> Swift.Void What does 3rd type stand for? I have to look at the Objective-C version of the code to know these are returnedItems . Why it is not implemented

var names = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight"]; var digit_name = function(n){ return names[n]; } //Execute digit_name(0) VERSUS var digit_name = (function() { var names = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight"]; return function(n) { return names[n]; } })(); then execute it like this: digit_name(2) I know these are both closures, but I also think that there are some fundamental differences between the way the two are setup. Can someone point out how different are these two setups (especially considering both get the same job

There are some other questions on here that are similar but sufficiently different that I need to pose this as a fresh question: I have created an empty class, lets call it Test. It doesn't have any properties or methods. I then iterate through a map of key/value pairs, dynamically creating properties named for the key and containing the value... like so: def langMap = [:] langMap.put("Zero",0) langMap.put("One",1) langMap.put("Two",2) langMap.put("Three",3) langMap.put("Four",4) langMap.put("Five",5) langMap.put("Six",6) langMap.put("Seven",7) langMap.put("Eight",8) langMap.put("Nine",9)

I need to monkey-patch my library to replace an instance of a symbol, and it's getting referenced by some function closures. I need to copy those functions (since I also need access to original unpatched version of the function as well), but __closure__ is immutable, and I can't copy.copy it, so how can I create new closure cells objects in Python 2.7? I for example given this function def f(): def incorrectfunction(): return 0 def g(): return incorrectfunction() return g def correctfunction(): return 42 func = f() patched_func = patchit(f) # replace "incorrectfunction" print func(), patched