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POStoring custom objects in an NSMutableArray in NSUserDefaults
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537044
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537849
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5
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0
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CreationDate
2009-02-11T14:32:38.363
FavoriteCount
63
LastActivityDate
2015-12-11T16:22:02.623
LastEditDate
2017-05-23T12:09:15.117
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-1
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258
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0
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1
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99
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67675
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tigermain
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I've recently been trying to store the search results of my iPhone app in the NSUserDefaults collection. I also use this to save user registration info successfully, but for some reason trying to store my NSMutableArray of custom Location classes always comes back empty. I tried converting the NSMutableArray to a NSData element as of this post but I get the same result (<a href="https://stackoverflow.com/questions/350848/possible-to-save-an-integer-array-using-nsuserdefaults-on-iphone">Possible to save an integer array using NSUserDefaults on iPhone?</a>) The code samples I have tried are: Save: <pre><code>[prefs setObject:results forKey:@"lastResults"]; [prefs synchronize]; </code></pre> or <pre><code>NSData *data = [NSData dataWithBytes:&results length:sizeof(results)]; [prefs setObject:data forKey:@"lastResults"]; </code></pre> or <pre><code>NSData *data = [NSKeyedArchiver archivedDataWithRootObject:results]; [prefs setObject:data forKey:@"lastResults"]; </code></pre> Load: <pre><code>lastResults = (NSMutableArray *)[prefs objectForKey:@"lastResults"]; </code></pre> or <pre><code>NSData *data = [prefs objectForKey:@"lastResults"]; memcpy(&lastResults, data.bytes, data.length); </code></pre> or <pre><code>NSData *data = [prefs objectForKey:@"lastResults"]; lastResults = [NSKeyedUnarchiver unarchiveObjectWithData:data]; </code></pre> After following advice below I have also implemented NSCoder in my object (ignore the overuse of NSString its temporary): <pre><code>#import "Location.h" @implementation Location @synthesize locationId; @synthesize companyName; @synthesize addressLine1; @synthesize addressLine2; @synthesize city; @synthesize postcode; @synthesize telephoneNumber; @synthesize description; @synthesize rating; @synthesize priceGuide; @synthesize latitude; @synthesize longitude; @synthesize userLatitude; @synthesize userLongitude; @synthesize searchType; @synthesize searchId; @synthesize distance; @synthesize applicationProviderId; @synthesize contentProviderId; - (id) initWithCoder: (NSCoder *)coder { if (self = [super init]) { self.locationId = [coder decodeObjectForKey:@"locationId"]; self.companyName = [coder decodeObjectForKey:@"companyName"]; self.addressLine1 = [coder decodeObjectForKey:@"addressLine1"]; self.addressLine2 = [coder decodeObjectForKey:@"addressLine2"]; self.city = [coder decodeObjectForKey:@"city"]; self.postcode = [coder decodeObjectForKey:@"postcode"]; self.telephoneNumber = [coder decodeObjectForKey:@"telephoneNumber"]; self.description = [coder decodeObjectForKey:@"description"]; self.rating = [coder decodeObjectForKey:@"rating"]; self.priceGuide = [coder decodeObjectForKey:@"priceGuide"]; self.latitude = [coder decodeObjectForKey:@"latitude"]; self.longitude = [coder decodeObjectForKey:@"longitude"]; self.userLatitude = [coder decodeObjectForKey:@"userLatitude"]; self.userLongitude = [coder decodeObjectForKey:@"userLongitude"]; self.searchType = [coder decodeObjectForKey:@"searchType"]; self.searchId = [coder decodeObjectForKey:@"searchId"]; self.distance = [coder decodeObjectForKey:@"distance"]; self.applicationProviderId = [coder decodeObjectForKey:@"applicationProviderId"]; self.contentProviderId = [coder decodeObjectForKey:@"contentProviderId"]; } } - (void) encodeWithCoder: (NSCoder *)coder { [coder encodeObject:locationId forKey:@"locationId"]; [coder encodeObject:companyName forKey:@"companyName"]; [coder encodeObject:addressLine1 forKey:@"addressLine1"]; [coder encodeObject:addressLine2 forKey:@"addressLine2"]; [coder encodeObject:city forKey:@"city"]; [coder encodeObject:postcode forKey:@"postcode"]; [coder encodeObject:telephoneNumber forKey:@"telephoneNumber"]; [coder encodeObject:description forKey:@"description"]; [coder encodeObject:rating forKey:@"rating"]; [coder encodeObject:priceGuide forKey:@"priceGuide"]; [coder encodeObject:latitude forKey:@"latitude"]; [coder encodeObject:longitude forKey:@"longitude"]; [coder encodeObject:userLatitude forKey:@"userLatitude"]; [coder encodeObject:userLongitude forKey:@"userLongitude"]; [coder encodeObject:searchType forKey:@"searchType"]; [coder encodeObject:searchId forKey:@"searchId"]; [coder encodeObject:distance forKey:@"distance"]; [coder encodeObject:applicationProviderId forKey:@"applicationProviderId"]; [coder encodeObject:contentProviderId forKey:@"contentProviderId"]; } </code></pre>
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Storing custom objects in an NSMutableArray in NSUserDefaults
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1. USAnthony Main
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