Objective-C Programming: The Big Nerd Ranch Guide

Zeroing of weak references

To see weak references in action, let’s add another array to the mix. What if you wanted an array of all assets – even ones that have not been assigned to a particular employee? You could add the assets to an array as they are created. Add a few lines of code to main.m:

#import <Foundation/Foundation.h> #import "BNREmployee.h" #import "BNRAsset.h" int main(int argc, const char * argv[]) { @autoreleasepool { // Create an array of Employee objects NSMutableArray *employees = [[NSMutableArray alloc] init]; for (int i = 0; i < 10; i++) { // Create an instance of BNREmployee BNREmployee *mikey = [[BNREmployee alloc] init]; // Give the instance variables interesting values [mikey setWeightInKilos:90 + i]; [mikey ...