nsarray

问题 I currently have this array of NSDictionary s in my table view, but I need to duplicate the number of dictionaries in the array as the table view scrolls down. Is there a way to achieve this, and also specify or know what the dictionary names will be? NSMutableDictionary *d0 = [[NSMutableDictionary alloc] init]; NSMutableDictionary *d1 = [[NSMutableDictionary alloc] init]; NSMutableDictionary *d2 = [[NSMutableDictionary alloc] init]; NSMutableDictionary *d3 = [[NSMutableDictionary alloc] init

问题 I want compare 2 NSMutableArray values and check which indexPath is different and store this numbers of index in one array. for example I have these NSMutableArray : NSMutableArray *a = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6", nil]; NSMutableArray *b = [[NSMutableArray alloc]initWithObjects:@"11",@"2",@"5",@"3",@"53",@"6", nil]; and I want to compare these two NSMutableArray index to index (compare value to value) and tell me that which index of array in these

问题 Still have some difficulties to understand Obj-C's gestion of memory and some of its concepts. So my main class contains a NSMutableArray containing some characters and their list of weapons. It's like this : In Main class.h @property (nonatomic, retain) NSMutableArray *players; In Main class.m's init for(int i = 0 ; i < 30 ; i++) { [players addObject:[[PlayerInGame alloc] init:[self.tabPlayers objectAtIndex:i] :[self.tabWeapons:objectAtIndex:i]]]; } PlayerInGame.h @property (nonatomic,

问题 I have a list of NSDictionary, and i want to save it in a file. I can save it in text file but i can't read it to [NSDictionary] var text : [NSDictionary] = [] save file let json = JSONSerializer.toJson(text) try json.write(to: path, atomically: false, encoding: String.Encoding.utf8) This is my list NSDictionary [{ change = true; name = data1; },{ change = true; name = data2; }] 回答1: do { let text2 = try NSString(contentsOfURL: path, encoding: NSUTF8StringEncoding) // path give your file path

问题 In my app I have a db with 50k+ contacts. To display them on list view, I need to calculate the index section titles to display them on the right side. However my logic is taking time around 3-6 seconds to prepare the datasource. -(NSArray *)getSectionTitleBasedOn:(NSString*)sortBy{ for (RealmContact *contact in contactSource){ if (contact.firstName.length>0) { if ([sortBy isEqualToString:@"FirstName"]) { NSString *firName= [contact.firstName stringByReplacingOccurrencesOfString:@" "

问题 Suppose I have a sorted array of integers int[], and I want to search the closest smaller value to some input number. for example if the array contains 1 , 23 , 57 , 59 , 120 and the input is 109 , the output should be 59 . I have tried this but it is not working out as needed. NSTimeInterval currentTime = self.player.currentTime; NSInteger playerTime=currentTime; NSUInteger index = [_timesArray indexOfObject:@(playerTime) inSortedRange:NSMakeRange(0, _timesArray.count-1) options

问题 I have a TableView with some TextFields in. The values of said TextFields are linked to certain positions in a 2D Array (NSArray of NSMutableArrays). An initial clean array is defined as so: self.cleanEditContents = @[ [@[@-1,@-1] mutableCopy], [@[@0,@80] mutableCopy], [@[@0,@500] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1] mutableCopy], [@[@-1,@-1]

问题 I am trying to populate an NSArray with a collection of data I get from CoreData. But my array doesnt seem to be populating with the data. I have the following code to retrieve the data: NSManagedObjectContext *managedObjectContext = [self managedObjectContext]; NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"WeightLog"]; self.contactarray = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy]; And I am using the following for loop to

问题 I'm trying to display an array of numbers in a UILabel using a timer,and show them in the order set in the array, but I only receive the Title in the format and then a SIGABRT ! any suggestions...Thanks Part of the code with problems! -(IBAction) rotate3 { NSString *number = [dayArray initWithArray:(NSArray *)dayArray]; NSArray *array = [[NSArray alloc] initWithObjects: @"0", @"1", @"2", @"3", @"4", @"5" ,@"6", @"7", @"8",@"9",@"10",@"11",@"12",@"13", @"14", @"15", @"16", @"17", @"18", @"19"

问题 I have created a NSArray that contains images objects. Based on the swipe direction recognized by UISwipeGestureRecognizerDirection the index is incremented up or down so the right image could be selected. The problem I have is that my NSArray is returning a NULL value instead of the image object. Therefore the UIImageView (named imageView) displays nothing. I am printing an NSLog statement in order to see what is really happening - example below: ... [2307:60b] Swiped and the index is: 1,