nsmutabledictionary

问题 I am using block based enumeration similar to the following code: [[[rows objectForKey:self.company.coaTypeCode] objectForKey:statementType] enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(id coaItem, NSUInteger idx, BOOL *stop) { // block code here }] I would like to remove some of the objects during the enumeration process depending on the their object values. How could I do this? I know that manipulating an mutable array or dictionary (NSMutableArray or NSMutableDictionary

问题 Is it possible to observe (subscribe to) changes to values stored under different keys in an NSMutableDictionary? In my case the keys would already exist when the subscription is initiated, but the values change and I would like to be notified in this case. I would like the key of the changed value in the notification. I assume that if my dictionary keys were all NSString instances I could just subscribe to each key path individually. But what if my keys are non-strings? Am I out of luck in

问题 I have NSMutableDictionary that looks like this: category = ( { description = ( { id = 1; name = Apple; }, { id = 5; name = Pear; }, { id = 12; name = Orange; } ); id = 2; name = Fruits; }, { description = ( { id = 4; name = Milk; }, { id = 7; name = Tea; } ); id = 5; name = Drinks; } ); Now, when a user performs an action in my application, I get the @"name"-value of the object, like "Apple". I would like to remove that object from the dictionary, but how will can I reach this object with

问题 I have two dictionary with multiple items. I want to compare values. Dict1:{ "Displacement_trim" = "49.26 "; "Dry_Weight" = "<null>"; } Dict2:{ "Displacement_trim" = "171.20 "; "Dry_Weight" = "<null>"; } I want to know which "Displacement_trim" is greater. Also checking null values. Print the data in cell. How can I achieve this? 回答1: To find out which value from the dict is bigger use the following code: Swift 3 let dict1 = [ "Displacement_trim" : "49.26", "Dry_Weight" : "<null>" ] let dict2

问题 I have a NSDictionary and a NSArray : self.dataDic = [[[NSDictionary alloc] init] autorelease]; self.dataDicKey = [[[NSArray alloc] init] autorelease]; These are the key and value of my NSDictionary : self.dataDic = @{@"Ring Cloud" :@[@"Contact Cloud", @"Image Cloud", @"Data Cloud"], @"Ring Tools" :@[@"Sticker Market", @"Live Poll", @"Mail"], @"Ring Apps" :@[@"Studio", @"Player"]}; Now what I want is to insert all the key value of my self.dataDic into self.dataDicKey sequentially. That means

问题 I have a NSDictionary and a NSArray : self.dataDic = [[[NSDictionary alloc] init] autorelease]; self.dataDicKey = [[[NSArray alloc] init] autorelease]; These are the key and value of my NSDictionary : self.dataDic = @{@"Ring Cloud" :@[@"Contact Cloud", @"Image Cloud", @"Data Cloud"], @"Ring Tools" :@[@"Sticker Market", @"Live Poll", @"Mail"], @"Ring Apps" :@[@"Studio", @"Player"]}; Now what I want is to insert all the key value of my self.dataDic into self.dataDicKey sequentially. That means

问题 Suppose we have simple NSDictionary class, can one of its objects be an NSMutableDictionary object? When we edit a value within the NSMutableDictionary object, we are only editing values of the object of NSDictionary . Since we are not editing the object of NSDictionary , should it be a problem for the non-mutable NSDictionary class? 回答1: The mutability of a collection class refers only to the ability to modify the collection as a whole, not the members. The collection in fact just consists

问题 This question already has answers here : What's the difference between a dictionary and an array? (6 answers) Closed 6 years ago . I'm in a dilemma in terms of which of the two I should use. I will be retrieving a group of data via a restful API (returns json) and I'm not sure how I should store them before I display it on my UI View Table. eg. {"Events":[{"Id":5,"Name":"Event 1 2013"},{"Id":6,"Name":"Event 2 2013"}]} I've been reading tutorials and some would use NSMutableArrays while some

问题 I have an NSMutableDictionary, and I wrote it using [stuff writeToFile:@"TEST" atomically:YES]; How can I retrieve it in the future? Also, what would happen if I decide to replace my iPhone 4 with the 4S? Can my piece of written data be transferred? 回答1: I think you want something like: [[NSMutableDictionary alloc] initWithContentsofFile:[self dataFilePath]]; You do need to obtain the correct path to store and retrieve your file, along the lines of this routine: - (NSString *)dataFilePath {

问题 I'm maintaining a NSMutableDictionary which holds key and value pair.Now i need to perform some operation for each value in it.How to retrive value from dictionary. // this is NSMutableDIctionary NSMutableDictionary *dictobj = [[NSMutableDictionary alloc]init]; // in methodA -(void)methodA { //get the value for each key and peform an operation on it. } How to proceed? plz help 回答1: for (id key in dictobj) { id value = [dictobj objectForKey:key]; [value doSomething]; } 回答2: I'm not entirely