Sometimes this error pops up when running an app on an iOS device: Could not change executable permissions on the application. Usually this is caused by an app with a re-purposed Bundle Identifier. If you create a new app and use the same Bundle Identifier as a different app that is already installed, then Xcode […]
Sometimes iOS updates go awry. It may happen that the device hangs itself for good, refusing to activate or be recognised by iTunes. In that case, it’s time for a DFU reset, also known as Recovery Mode. Download an .ipsw file for your device from the Developer Centre (either a beta or the release version) […]
Today Xcode surprised me with an error message I hadn’t heard before: property’s synthesized getter follows Cocoa naming convention for returning ‘owned’ objects. At first I thought, “isn’t that a good thing?”, and after checking how I had defined a new property I was clueless why this was happening: @property (nonatomic, strong) Phrase *newPhrase; What […]
NSManagedObjects behave differently to NSObjects on many levels. If you’d like to add custom start-up behaviour in your NSManagedObjects, you’ll have noticed that overriding the standard init method isn’t working. Instead, we can use the awakeFromFetch method. This is called automatically when a managed object is retrieved from the Core Data stack: – (void)awakefrom { […]
If you’re running Mavericks then sadly the iOS 5 simulator is gone for good – both in Xcode 5 as well as Xcode 4.6.3. It appears that the Mavericks kernel is no longer compatible with iOS 5 any more, and we only have access to the iOS 6.0, 6.1, 7.0 and 7.1 simulators. To use […]
I wanted to test if a string has a value when it’s returned from Core Data. So I thought, the right way to do this was to see if it’s equal to nothing, like so: if ([myString isEqualToString:@””]) { // should be empty… but may not be } But to my surprise this didn’t work […]
Imagine you’re presenting a view controller in your storyboard via a Popover Segue: Simply drag from a button in your Main View Controller to your Other View Controller, and under segue select “Popover”. Works like a charm: the popover is presented, and if someone clicks outside the popover it is dismissed. Marvellous! Surely we should […]
Creating picker views is similar to creating table views: you supply an array of data for each component by conforming to the UIPickerViewDataSource protocol. A component is equivalent to a section in a table view, and each component can have several sections. You can’t set much of this up in interface builder other than add […]
