nsmutablearray

问题 I need to create a mutable two-dimensional array in Objective-C. For example I have: NSMutableArray *sections; NSMutableArray *rows; Each item in sections consists of an array rows . rows is an array that contains objects. And I want to do something like this: [ sections[i] addObject: objectToAdd]; //I want to add a new row In order have something like this: section 0, rows: obj1, obj2, obj3 section 1, rows: obj4, obj5, obj6, obj 7... Is there a way to do that in Objective-C? 回答1: First, you

问题 Can anyone tell me why logging [self.giftees count] keeps returning 0 even though I'm adding objects to it? header: #import <UIKit/UIKit.h> @interface Test2AppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; NSMutableArray *giftees; } @property (nonatomic, retain) UIWindow *window; @property (nonatomic, retain) NSMutableArray *giftees; @end called from didFinishLaunchingWithOptions: - (void)bootstrapGiftees { NSArray *gifteeNames = [NSArray arrayWithObjects:@"Jesse",,nil]; for

问题 Can anyone tell me why logging [self.giftees count] keeps returning 0 even though I'm adding objects to it? header: #import <UIKit/UIKit.h> @interface Test2AppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; NSMutableArray *giftees; } @property (nonatomic, retain) UIWindow *window; @property (nonatomic, retain) NSMutableArray *giftees; @end called from didFinishLaunchingWithOptions: - (void)bootstrapGiftees { NSArray *gifteeNames = [NSArray arrayWithObjects:@"Jesse",,nil]; for

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . Instead of accessing specific latitude with hardcoded as shown in below NSString *path = [[NSBundle mainBundle] pathForResource: @"WellList" ofType:@"plist"]; NSMutableDictionary *root = [[NSMutableDictionary alloc] initWithContentsOfFile:path]; NSString* latitude = [[[[[root objectForKey: @"Routes

问题 I have an array here, example I have 4 images on each column, each responds to its default index: When an image is deleted for example index 1. as shown in the image below: The index becomes 0,1,2 : which I want to be is 0,2,3 (Which is the original array index): Could anyone help me on how to achieve this? my code for my array: self.myImages = [NSMutableArray array]; for(int i = 0; i <= 10; i++) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES

问题 I'm trying to add objects to a NSMutableArray through a for loop. But it seems whenever I add an object it replaces the old one so that I only have one object in the array at the time... Do you have any idea of what might be wrong? - (void)viewDidLoad { [super viewDidLoad]; LoginInfo *info = [[LoginInfo alloc] init]; info.startPost = @"0"; info.numberOfPosts = @"10"; info.postType = @"1"; getResults = [backendService getAllPosts:info]; for (NSInteger i = 0; i < [getResults count]; i++) { Post

问题 Is there an easy way to sort an NSMutableArray of NSMutableArrays containing NSStrings? I am sure that there must be an easy method for doing this but I can't seem to find it. To Clarify I want to sort the first array alphabetically by the NSString at index 3 of the sub array. 回答1: Didn't see anyone actually answering this with other than "use this function, figure it out". So here is some actual code that you can use. Put this category at the end of your .h file (or anywhere and import the

问题 I am trying to copy NSMutableArray to another but it does not show me anything at the UITableView : NSMutableArray *objectsToAdd= [[NSMutableArray alloc] initWithObjects:@"one",@"two"]; NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:objectsToAdd,nil]; NSMutableArray *list = [[NSMutableArray alloc] init]; [self.list addObjectsFromArray:myArray]; Nothing show up! What is wrong? It crashes my app because I do not have nil at my NSMutableArray how can I add nil to it? addobject

问题 I have an NSArray that contains a couple of items. The NSArray is loaded into a uitableview from another class. when I back out of the detail view and re-enter (for the 3rd time), the NSArray is empty and the tableview is empty as well. What is happening? (I am using arc so I don't think it is a leak) - (void)viewDidLoad { myMatch = [[Match alloc] initWithId:1 OpponentId:13]; } - (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString

问题 This question already has an answer here : Parsing Json to get all the contents in one NSArray (1 answer) Closed 5 years ago . for the moment I fill in my array directly by a native objective-C code : Datas *pan1 = [[Datas alloc] initWithTitle:@"My array 1" title:@"Shakespeare's Book" location:@"London"]; Datas *pan2 = [[Datas alloc] initWithTitle:@"My array 2" title:@"Moliere's Book" location:@"London"]; NSMutableArray *datasListe = [NSMutableArray arrayWithObjects:pan1, pan2, nil]; But I