When you’re displaying a UIImage in your view controller it’s hardly noticeable how long it actually takes for the engine to “draw” the picture. Lenoard van Driel has tested this and confirms it takes 80ms – or in television terms, 2 frames. That’s something worth putting an audio delay in for. Drawing several images in […]
How to insert special characters on Mac
You can delete individual objects by using the NSManagedObjectContext method deleteObject, like so: [self.managedObjectContext deleteObject:yourManagedObject]; To delete all managed objects from your store, you can use a for-in loop: – (void)clearCoreData { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@”YourEntity” inManagedObjectContext:self.managedObjectContext]; [fetchRequest setEntity:entity]; NSError *error = nil; NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest […]
How to tweak SQLIte Performance in Core Data – thanks to @artandlogic
Add this statement to your app’s Run Scheme -com.apple.CoreData.SQLDebug 1 and your Log Console shall be populated with fascinating statements such as 2013-11-20 18:49:53.715 YourApp[6245:70b] CoreData: annotation: Connecting to sqlite database file at “/Users/versluis/Library/Application Support/iPhone Simulator/7.1-64/Applications/1FED9364-3039-4D47-967E-9B075CBE8277/Documents/PatchBay.sqlstore” 2013-11-20 18:49:53.717 YourApp[6245:70b] CoreData: sql: pragma journal_mode=wal 2013-11-20 18:49:53.718 YourApp[6245:70b] CoreData: sql: pragma cache_size=200 2013-11-20 18:49:53.719 YourApp[6245:70b] CoreData: sql: […]
Same as in Xcode 4 – find the following commands from the Main Menu: Product Scheme – Edit Scheme find Run in the left hand column click the Arguments tab
There are two ways to determine this: at runtime (i.e. in your running code), and at compile time (i.e. before the code is compiled). Let’s take a look at both options. Runtime Check // testing for 64bit at runtime if (sizeof(void*) == 4) { self.textLabel.text = @”You’re running in 32 bit”; } else if (sizeof(void*) […]
Here’s how we can do this, with the help of our old friend the NSDateFormatter: // here we have a date NSString *dateString = @”11/01/1989″; // convert it into an NSDate object NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; [formatter setDateFormat:@”dd/MM/yyyy”]; NSDate *theDate = [formatter dateFromString:dateString]; // so what is that? NSLog(@”Your Date Object is %@”, theDate); […]
