Embed Tab Bar Controller in Navigation Controller

I don’t think you’re really supposed to do this since the option is grayed out in Xcode when you select Editor -> Embed in Navigation Controller, but a hacky way to get around it is to control-drag from a free-standing Navigation Controller to the Tab Bar Controller and select “root view controller.”

Add Tab to Tab Bar Controller

Control-click from the Tab Bar Controller to the controller you want to be the new tab and select “view controllers.”

Notifications in iOS

Posting a Notification First, create a global key before the class definition of the class that is posting the notification Post the notification

Add Share Button to iOS 9 App

@IBAction func export(sender: UIBarButtonItem) { if let data = prepareCSVData() { let filename = getDocumentsDirectory().stringByAppendingPathComponent(“data.csv”) data.writeToFile(filename, atomically: true) let url = NSURL(fileURLWithPath: filename) let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil) if let popoverController = activityViewController.popoverPresentationController { popoverController.barButtonItem = sender } presentViewController(activityViewController, animated: true, completion: nil) } else { NSLog(“Unable to prepare data”) } } The… Continue reading Add Share Button to iOS 9 App

Send Mail with Attachment in iOS

if MFMailComposeViewController.canSendMail() { let data = prepareCSVData() let mailController = MFMailComposeViewController() mailController.mailComposeDelegate = self mailController.setSubject(“Data Export”) mailController.setMessageBody(“Attached is a CSV file containing your data.”, isHTML: false) // Add attachment if let data = data { mailController.addAttachmentData(data, mimeType: “text/comma-separated-values”, fileName: “headaches.csv”) presentViewController(mailController, animated: true, completion: nil) } else { NSLog(“No data”) } }  

Xcode 7 Archive Button Grayed Out

One reason the Archive button may be grayed out in Xcode is that you need to be connected to a device, and choose that device. See here: http://stackoverflow.com/questions/16050640/xcode-product-archive-disabled/18791703#18791703

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Scroll to the Bottom of a Collection View

private func scrollToBottom() { let lastSectionIndex = (collectionView?.numberOfSections())! – 1 let lastItemIndex = (collectionView?.numberOfItemsInSection(lastSectionIndex))! – 1 let indexPath = NSIndexPath(forItem: lastItemIndex, inSection: lastSectionIndex) collectionView!.scrollToItemAtIndexPath(indexPath, atScrollPosition: UICollectionViewScrollPosition.Bottom, animated: false) }  

NSDateFormatter Styles

Here is a great guide for how to format the string for the dateFormat method (like “yyyy-MM-dd”): http://www.codingexplorer.com/swiftly-getting-human-readable-date-nsdateformatter/

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Add a UITableView to an Existing ViewController in Xcode

Quick and dirty checklist for adding a table view to an existing view controller: Embed existing view controller in a NavigationController Drag a UITableView object into the view controller in the storyboard Make the UITableView the same width and height as the view controller and set the constraints to all four sides with no margins… Continue reading Add a UITableView to an Existing ViewController in Xcode