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copied!<p>Your header Crap file should be</p> <pre><code>#import <Foundation/Foundation.h> @interface Crap : NSObject <NSCoding> @property (nonatomic, retain) NSArray *crapArray; + (Crap *) crap; - (void)encodeWithCoder:(NSCoder *)enCoder; - (id)initWithCoder:(NSCoder *)aDecoder; @end </code></pre> <p>Your implementation Crap file should be</p> <pre><code>#import "Crap.h" @implementation Crap @synthesize crapArray; + (Crap *) crap { static Crap *crap = nil; if (!crap) { crap = [[super allocWithZone:nil] init]; } return crap; } + (id) allocWithZone:(struct _NSZone *)zone { return [self crap]; } - (id) init { self = [super init]; if (self) { // set default property values crapArray = nil; } return self; } - (void)encodeWithCoder:(NSCoder *)encoder { //Encode properties, other class variables, etc [encoder encodeObject:self.crapArray forKey:@"crapArray"]; } - (id)initWithCoder:(NSCoder *)decoder { if((self = [super init])) { //decode properties, other class vars self.crapArray = [decoder decodeObjectForKey:@"crapArray"]; } return self; } @end </code></pre> <p>Then to set the value you got to do something like</p> <pre><code>[Crap crap].crapArray = [NSArray arrayWithObjects:@"Hello", @"Bye", nil]; </code></pre> <p>And to get that value from another view controller you got to do something like</p> <pre><code>NSLog(@"Value: %d", [[Crap crap] crapArray].count); </code></pre> <p>If you do</p> <pre><code>Crap *crap = [[Crap alloc] init]; NSLog(@"%d", crap.crapArray.count); </code></pre> <p>crapArray will be set to nil and you are going to get 0 again, because we are setting crapArray to nil on the init method.</p>

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