properties have a specific meaning in Objective-C, but I think you mean something that’s equivalent to a static variable? E.g. only one instance for all types of Foo? To declare class functions in Objective-C you use the + prefix instead of – so your implementation would look something like: // Foo.h @interface Foo { } … Read more
You can still delete the file programmatically, using the NSFileManager:removeItemAtPath:: method. NSPersistentStore *store = …; NSError *error; NSURL *storeURL = store.URL; NSPersistentStoreCoordinator *storeCoordinator = …; [storeCoordinator removePersistentStore:store error:&error]; [[NSFileManager defaultManager] removeItemAtPath:storeURL.path error:&error]; Then, just add the persistent store back to ensure it is recreated properly. The programmatic way for iterating through each entity is both … Read more
Using break-inside should work: @media print { div { break-inside: avoid; } } It works on all major browsers: Chrome 50+ Edge 12+ Firefox 65+ Opera 37+ Safari 10+ Using page-break-inside: avoid; instead should work too, but has been exactly deprecated by break-inside: avoid.
Taken from the NSString reference, you can use : NSString *theFileName = [[string lastPathComponent] stringByDeletingPathExtension]; The lastPathComponent call will return thefile.ext, and the stringByDeletingPathExtension will remove the extension suffix from the end.
Make sure you have the latest version of CocoaPods installed. $ pod update PODNAME was introduced recently. See this issue thread for more information: $ pod update When you run pod update SomePodName, CocoaPods will try to find an updated version of the pod SomePodName, without taking into account the version listed in Podfile.lock. It … Read more
Despite the “Unknown class MyClass in Interface Builder file.” error printed at runtime, this issue has nothing to do with Interface Builder, but rather with the linker, which is not linking a class because no code uses it directly. When the .nib data (compiled from the .xib) is loaded at runtime, MyClass is referenced using … Read more
It’s a visibility modifier—it means that instance variables declared as @private can only be accessed by instances of the same class. Private members cannot be accessed by subclasses or other classes. For example: @interface MyClass : NSObject { @private int someVar; // Can only be accessed by instances of MyClass @public int aPublicVar; // Can … Read more
This code works on any thread: NSLog(@”%@”, NSThread.callStackSymbols); Returns an array containing the call stack symbols. Each element is an NSString object with a value in a format determined by the backtrace_symbols() function.
Although Core Data is a descendant of Apple’s Enterprise Object Framework, an object-relational mapper (ORM) that was/is tightly tied to a relational backend, Core Data is not an ORM. It is, in fact, an object graph management framework. It manages a potentially very large graph of object instances, allowing an app to work with a … Read more
Xcode includes XCTest, which is similar to OCUnit, an Objective-C unit testing framework, and has full support for running XCTest-based unit tests as part of your project’s build process. Xcode’s unit testing support is described in the Xcode Overview: Using Unit Tests. Back in the Xcode 2 days, I wrote a series of weblog posts … Read more