SwiftUI
SwiftUI: AppStorage with Dynamic Key
If we want to use @AppStorage but with a dynamic key passed to the View we can do this: DynamicKeyApp.swift ContentView.swift
SwiftUI
SwiftUI: AppStorage with a Custom UserDefaults Suite
Here is one way to implement @AppStorage using a custom UserDefaults suite by way of the defaultAppStorage View modifier and a class extension. GroupDefaultsTestApp.swift ContentView.swift
MapKit
MKMapSnapshotter initWithOptions nullability
MKMapSnapshotter has the following constructor (within NS_ASSUME_NONNULL_BEGIN): – (instancetype)initWithOptions:(MKMapSnapshotOptions *)options NS_DESIGNATED_INITIALIZER; Which means an options param must be supplied. However the documentation contradicts this, stating “If you specify nil for this property, the snapshotter uses a set of default options that capture an image of the current user’s country”, thus Read more
CoreData
The Reason NSFetchedResultsChangeUpdate Is so Buggy
Always wondered why NSFetchedResultsChangeUpdate is so buggy? The reason is Apple don’t actually use it in their own apps. Instead, what they do is have a UITableViewCell subclass with a custom property setter for the object where they add KVO for only the properties they are interested in updates to, Read more
CoreData
New Way to Override NSManagedObject Properties
There is a new, yet not very well-known way to override NSManagedObject properties without needing to manually call KVO methods willChangeValueForKey etc. This is achieved using dynamic accessors prefixed with managedObjectOriginal as follows: Department.h @interface Department : NSManagedObject @property (nullable, nonatomic, copy) NSString *name; @end Department.m @interface Department (DynamicAccessors) – (NSString Read more
Objective-C
Common Init for a UIViewController Subclass
When creating a UIViewController subclass, e.g. in a framework, which you require to support being created from both storyboards and code, it is useful to implement initialisation which works for both. That can be achieved with a common init routine as follows: – (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super Read more
Mac
How to change the screenshot save folder on your Mac
By default, screenshots save to the Desktop which isn’t ideal. With this terminal command you can change the folder, e.g. to the Pictures folder: defaults write com.apple.screencapture location ~/Pictures To remove the setting and go back to the default do: defaults delete com.apple.screencapture location To query what the current setting Read more
Mac
Revisiting Hackintosh
Like many others I’ve been unhappy with the lack of Mac hardware lately so thought I’d revisit the world of osx86 after many years. There seems to be many more people involved in the scene now including some excellent how-to Youtube videos even by some high profile Mac blogs and Read more
Objective-C
Modern way to register NSUserDefaults
Here is a modern way to register user defaults. It uses dispatch_once to ensure the registration only happens once and performs it lazily on the first access. Keeps your defaults all on the one place. Also it is implemented as a global block in the class. NSInteger (^countBeforeAlerting)(void) = ^NSInteger(void) Read more
Xcode
Where to find IOKit headers for iOS
Sometimes when compiling more sophisticated iOS projects you need the IOKit headers which were removed from the iOS SDK a few versions ago. A simple workaround is to copy them from the Mac OS SDK to the iOS SDK with these commands: sudo cp -r /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/IOKit.framework/Versions/A/Headers /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/IOKit.framework Sometimes you also need OSTypes.h from Read more