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POGet NSMutableDictionary from Singleton?
 

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  1. POGet NSMutableDictionary from Singleton?
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    <p>I created a singleton class in order to share an object inside my program. Here's the code:</p> <p>SelectedRow.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "TableEntry.h" @interface SelectedRow : NSObject { TableEntry *rowValue; } @property (nonatomic, retain) TableEntry *rowValue; + (id)sharedManager; - (void)setVariable:(TableEntry*)value; @end </code></pre> <p>and SelectedRow.m</p> <pre><code>#import "SelectedRow.h" #import "TableEntry.h" @implementation SelectedRow @synthesize rowValue; + (id)sharedManager { static SelectedRow *sharedMyManager = nil; static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ sharedMyManager = [[self alloc] init]; }); return sharedMyManager; } - (id)init { if (self = [super init]) { rowValue = [[TableEntry alloc] init]; } return self; } - (void)setVariable:(TableEntry*)value { rowValue = value; } @end </code></pre> <p>while TableEntry.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface TableEntry : NSObject { @private NSString *videoId; NSString *videoCategory; NSString *videoTitle; NSString *videoDescription; NSDate *videoDate; NSMutableArray *videoRelatedVideos; NSDictionary *videoAdditionalInformation; NSString *videoAccessControl; NSArray *videoFields; NSMutableDictionary *days; NSMutableDictionary *views; NSMutableDictionary *watchtime; NSMutableDictionary *subscribers; NSMutableDictionary *shares; } @property (copy) NSString *videoId; @property (copy) NSString *videoCategory; @property (copy) NSString *videoTitle; @property (copy) NSString *videoDescription; @property (copy) NSMutableArray *videoRelatedVideos; @property (copy) NSDictionary *videoAdditionalInformation; @property (copy) NSArray *videoFields; @property (copy) NSString *videoAccessControl; @property (copy) NSDate *videoDate; @property (copy) NSMutableDictionary *days; @property (copy) NSMutableDictionary *views; @property (copy) NSMutableDictionary *subscribers; @property (copy) NSMutableDictionary *shares; @property (copy) NSMutableDictionary *watchtime; - (id)setId:(NSString*)Id setCategory:(NSString*)Category setDate:(NSDate*)date setTitle:(NSString*)title setDescription:(NSString*)description setRelatedVideos:(NSMutableArray*)relatedVideos setAdditionalInformation:(NSDictionary*)additionalInformation setAccessControl:(NSString*)accessControl setFields:(NSArray*)fields setDays:(NSMutableDictionary*)days setViews:(NSMutableDictionary*)views setSubscribers:(NSMutableDictionary*)subscribers setShares:(NSMutableDictionary*)shares setWatchtime:(NSMutableDictionary*)watchtime; - (NSString*)extractId; - (NSString*)extractCategory; - (NSString*)extractTitle; - (NSString*)extractDescription; - (NSMutableArray*)extractRelatedVideos; - (NSDictionary*)extractAdditionalInformationVideos; - (NSDictionary*)extractAccessControlVideos; - (NSArray*)extractFields; - (NSMutableDictionary*)extractDays; - (NSMutableDictionary*)extractViews; - (NSMutableDictionary*)extractSubscribers; - (NSMutableDictionary*)extractShares; - (NSMutableDictionary*)extractWatchtime; @end </code></pre> <p>and TableEntry.m</p> <pre><code>- (id)init { self = [super init]; if (self) { videoId = @"9bZkp7q19f0"; videoCategory = @"Music"; videoTitle = @"Demo Title"; videoDescription = @"Demo description"; videoDate = [NSDate date]; videoAdditionalInformation = [NSDictionary alloc]; videoRelatedVideos = [NSMutableArray alloc]; videoAccessControl = @"demo accesControl"; videoFields = [NSArray alloc]; days = [NSMutableDictionary alloc]; views = [NSMutableDictionary alloc]; shares = [NSMutableDictionary alloc]; subscribers = [NSMutableDictionary alloc]; watchtime = [NSMutableDictionary alloc]; } return self; } - (id)setId:(NSString*)Id setCategory:(NSString*)Category setDate:(NSDate*)date setTitle:(NSString*)title setDescription:(NSString*)description setRelatedVideos:(NSMutableArray*)relatedVideos setAdditionalInformation:(NSDictionary*)additionalInformation setAccessControl:(NSString*)accessControl setFields:(NSArray*)fields setDays:(NSMutableDictionary*)Days setViews:(NSMutableDictionary*)Views setSubscribers:(NSMutableDictionary*)Subscribers setShares:(NSMutableDictionary*)Shares setWatchtime:(NSMutableDictionary*)Watchtime { videoId = Id; videoCategory = Category; videoDate = date; videoTitle = title; videoDescription = description; videoRelatedVideos = relatedVideos; videoAccessControl = accessControl; videoAdditionalInformation = additionalInformation; videoFields = fields; days = Days; views = Views; subscribers = Subscribers; watchtime = Watchtime; shares = Shares; return self; } - (NSString*)extractId { return self.videoId; } - (NSString*)extractCategory{ return self.videoCategory; } - (NSString*)extractTitle{ return self.videoTitle; } - (NSString*)extractDescription{ return self.videoDescription; } - (NSMutableArray*)extractRelatedVideos{ return self.videoRelatedVideos; } - (NSString*)extractAccessControlVideos{ return self.videoAccessControl; } - (NSDictionary*)extractAdditionalInformationVideos{ return self.videoAdditionalInformation; } - (NSArray*)extractFields{ return self.videoFields; } - (NSMutableDictionary*)extractDays{ return self.days; } - (NSMutableDictionary*)extractSubscribers{ return self.subscribers; } - (NSMutableDictionary*)extractWatchtime{ return self.watchtime; } - (NSMutableDictionary*)extractShares{ return self.shares; } - (NSMutableDictionary*)extractViews{ return self.views; } @end </code></pre> <p>I can extract any values from the singleton with:</p> <pre><code>SelectedRow *selectedRow = [SelectedRow sharedManager]; NSString *videoID = [selectedRow.rowValue extractId]; </code></pre> <p>the problem arises with any NSMutableDictionary. If I try:</p> <pre><code>SelectedRow *selectedRow = [SelectedRow sharedManager]; NSMutableDictionary *days = [selectedRow.rowValue extractDays]; </code></pre> <p>or with any other NSMutableDictionary I get this error:</p> <pre><code>[NSMutableDictionary count]: method sent to an uninitialized mutable dictionary object </code></pre> <p>what I'm I doing wrong? Thanks</p>
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    1. PO
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    1. This table or related slice is empty.
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    1. USphcaze
    1. USphcaze
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. POGet NSMutableDictionary from Singleton?
      1. This table or related slice is empty.
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    2. VO
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      1. This table or related slice is empty.
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      1. This table or related slice is empty.
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    1. COThat is a lot of code to read through for something which is most likely a pretty simple problem. Any chance you could reduce the code to a few relevant lines, that can be compiled and executed as a stand-alone example?
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      1. USMonolo
    2. COUse [NSMutableDictionary new] instead of [NSMutableDictionary alloc], same thing for NSArrays and NSDictionaries. (BTW, whats the point of allocating immutable empty NSArrays and NSDictionaries? Either create their mutable counterparts (NSMutableArray, NSMutableDictionary), or assign them when needed.
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      1. POGet NSMutableDictionary from Singleton?
      1. USTamás Zahola
    3. COYup, always call `init...` right after every `alloc`. And to make a property of a mutable class `copy` is almost never what you want, make it strong instead! Otherwise you will always get a (immutable) copy of your ivar!
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