nsmutabledictionary

问题 Is there any particular reason why attempting to store and retrieve a value in an NSMutableDictionary using an NSIndexPath as a key might fail? I originally attempted to do this in order to store an NSMutableDictionary of UITableViewCell heights ( self.cellHeights ) for a UITableView . Each time you tapped a UITableViewCell , that cell would either expand or contract between two different heights based on the value stored in the NSMutableDictionary for that particular indexPath : - (CGFloat

问题 Is there any particular reason why attempting to store and retrieve a value in an NSMutableDictionary using an NSIndexPath as a key might fail? I originally attempted to do this in order to store an NSMutableDictionary of UITableViewCell heights ( self.cellHeights ) for a UITableView . Each time you tapped a UITableViewCell , that cell would either expand or contract between two different heights based on the value stored in the NSMutableDictionary for that particular indexPath : - (CGFloat

问题 I would like to save the content of a NSMutableDictionary object to a file. How do I do this ? I already know how to do this task with a NSDictionary object but I don't know how to convert/copy this NSMutableDictionary to a NSDictionary...unless there's a method to write directly the content of NSMutableDictionary to a file...I stress that the NSMutableDictionary object contains objects of NSDictionary type. Thx for helping, Stephane 回答1: NSMutableDictionary is a subclass of NSDictionary :

问题 I'm sure I'm missing something in a small iPhone program I'm trying to write, but the code is simple and it compiles without any errors and so I fails to see where the error is. I've set up a NSMutableDictionary to store students' attributes, each with a unique key. In the header file, I declare the NSMutableDictonary studentStore: @interface School : NSObject { @private NSMutableDictionary* studentStore; } @property (nonatomic, retain) NSMutableDictionary *studentStore; And of course in the

问题 I'm sure I'm missing something in a small iPhone program I'm trying to write, but the code is simple and it compiles without any errors and so I fails to see where the error is. I've set up a NSMutableDictionary to store students' attributes, each with a unique key. In the header file, I declare the NSMutableDictonary studentStore: @interface School : NSObject { @private NSMutableDictionary* studentStore; } @property (nonatomic, retain) NSMutableDictionary *studentStore; And of course in the

问题 Allright guys, I've been developing an app in which I have a NSMutableDictionary with an SKAction object in it. The SKAction is for playing a sound. This all works well, except ... the app crashes upon entering background with the following stack trace: * thread #1: tid = 0x187d7, 0x3461b932 libGPUSupportMercury.dylib`gpus_ReturnNotPermittedKillClient + 10, queue = 'com.apple.spritekit.renderQueue, stop reason = EXC_BAD_ACCESS (code=1, address=0x1) frame #0: 0x3461b932 libGPUSupportMercury

问题 Now I know that when swift compiles it just makes a NSDictionary, but the NSDictionary and Swift dictionaries have different syntax. Is there a way (through a loop or something) to convert a NSDictionary to a swift dictionary of the same type for <key, value> ? OR Is there a way to convert this to a Swift dictionary instead of NSDictionary? let jsonDict = NSJSONSerialization.JSONObjectWithData(jsonData, options: nil, error: &error) as NSDictionary 回答1: use: let jsonDic = NSJSONSerialization

问题 I am currently trying to parse some xml data into an NSDictionary . This is the first time I have tried something like this and am a little bit unsure of what I am doing, First off I am parsing some XML that looks roughly like this - <Rows> <Row ID="76" MANF="JARD" ISMANUF="F" ISSER="F"/> <Row ID="38" MANF ="SANBIN" ISMANUF ="F" ISSER ="T"/> <Rows> I am using the NSXMLParser delegates, so using a NSLog NSLog(@"attributes: %@", attributeDict); on parser:didStartElement:namespaceURI

问题 I have some questione about NSMutableDictionary. I read that they are only a wrapper around an hashmap, so their use for ordered list is discouraged. But I have to use it, so the problems began... I save the result of a Json (after a call to an URL) in a NSMutableDictionary and then I have two different "print": if I try to print the dictionary from console with command "po myDictionary" I have an order (the order of the original json) if I create a simple "for statement" and print every

问题 Please anybody help me.i am in great trouble....Now my Problem is... Using xml parser i have parsed some attribute and value of the attribute. using this i am getting the element name: - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes: (NSDictionary *)attributeDict Now using this i am getting value of the attribute from the xml: - (void)parser:(NSXMLParser *)parser foundCharacters: