show when run

I'm trying to recieve data from a server to initialize my app. However sometimes due to the network problem I cannot recieve any data. So at this time, I need to show an alert and exit the app. Here's my code:override func viewDidLoad() { super.viewDidLoad() / var params = Dictionary<String, String>(); params[path] = /; let response = ApiRequest.get(ApiRequest.LIST_FOLDER, params: params); if (response?.objectForKey(succ) == nil) { self.presentViewController(UIAlertController.init(title: Network Error, message: No recieved data, preferredStyle: UIAlertControllerStyle.Alert), animated: true, completion: nil); abort(); } if (response?.objectForKey(succ) as! String == 0) { UIAlertView(title: Server Error, message: Unable to process the request, delegate: nil, cancelButtonTitle: Cancel).show(); abort(); } folderList = FolderList(folders: response?.objectForKey(msg) as! NSDictionary); }But actually no alert view was shown when no network connection. Anybody knows why this happened?PS: if I

NSMutableAttributedString append NSTextAttachment , and set paragraphStyle.alignment = .justified， will Show Overlap，Word overlap。

As the title says, Xcode is showing the wrong documentation.For example, I subclass a UIView (say MyPrivateView : UIView), and when I control+click on it, it shows the documentation of UITabBarController.Is there anyway to fixx this?(I tried documenting the class, but no use ... This is something that would be distributed in a framework, so we don't like any weird documentation)Thank you

First Time: I detect beacons, Alert is displayed, to Show Artwork. But when I detect the beacons a second time, Alert not showing and the display of the screen is white I am new in swiftui, Please forgive me if I make a few mistakes My English isn’t so great. **Thanks! Any help would be deeply appreciated! **

I'm running into a bit of an issue with a menu attached to a UIButton in a Catalyst app. Clicking on the button works as expected: the menu appears (showsMenuAsPrimaryAction is set to true). However, because the button is in a form as a way for the user to select from a list of available options, I also need the ability to show the dropdown menu when I tab to the button from another field. I was hoping this would happen automatically if the button could become the first responder, but that does not appear to be the case. If there a way to make this happen?

Hope my scenario is not weird. Here is the description:1. User runs my app.2. User hides my app completely (all windows are hidden) so that he/she has no way to accessing the app. (Dont' ask why, user requested this feature and I want to implement it.)3. Now user rerun my app and I want to use XPC to tell the running instance to show itself.It sounds very reasonable and I have done most of code. But it is blocked by macOS the system. It seems macOS controls only one instnace of an app can be running at the same time; second try to run the same app (in /Applications) simply does nothing - the app code does not even get executed so that my code in main.m won't have the change to communicate with XPC.I believe there must be a way to overcome this. Any suggestions will be appreciated. Thanks and Merry Xmas!

I have installed the Developer Seed Utility, however running updates shows no updates available. Is there something different I should do.Thanks for your response