nsmutablearray

问题 I have a custom object called Occasion defined as follows: #import <Foundation/Foundation.h> @interface Occasion : NSObject { NSString *_title; NSDate *_date; NSString *_imagePath; } @property (nonatomic, retain) NSString *title; @property (nonatomic, retain) NSDate *date; @property (nonatomic, retain) NSString *imagePath; Now I have an NSMutableArray of Occasions which I want to save to NSUserDefaults. I know it's not possible in a straight forward fashion so I'm wondering which is the

问题 I want to check if an NSDictionary is empty. I am doing it like this. mutDictValues = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dicValues"]mutableCopy]; NSLog(@"dictValues are %@",mutDictValues); if(mutDictValues == NULL){ arrCities = [[NSMutableArray alloc]init]; NSLog(@"no cities seleceted"); }else{ arrCities = [[NSMutableArray alloc]init]; arrCities = [mutDictValues objectForKey:@"cities"]; [self placeCities]; } But it alwasy crashes on this line arrCities = [mutDictValues

问题 I'm storing a bunch of data in a .plist file (in the application documents folder), and it's structured like this: Dictionary { "description" = "String Value", "sections" = Array ( Array ( Number, ... Number ), Array ( Number, ... Number ) ), "items" = Array ( Array ( Number, ... Number ), Array ( Number, ... Number ) ) } If I just retrieve it with NSMutableDictionary *d = [[NSMutableDictionary alloc] initWithContentsOfFile:plistFile] I won't be able to replace the number objects, correct? So

问题 It is a simple pull to refresh case. I have data loaded into table and have a mutable data array at back-end, I receive a array of new data and want to add this complete array at start of existing array. One workaround is to create new array with new arrived data and then add previous array into it using addObjectsFromArray: method. Is there some workaround to add new data array to the start of previous array directly? 回答1: First, build an NSIndexSet . NSIndexSet *indexes = [NSIndexSet

问题 I'm doing this: for(int i=0;i>count;i++) { NSArray *temp=[[NSArray alloc]initWIthObjects]i,nil]; NSLog(@"%i",temp); } It returns to me 0,1,2,3....counting one by one, but I want an array with appending these values {0,1,2,3,4,5...}. This is not a big deal, but I'm unable to find it. I am new to iPhone. 回答1: NSMutableArray *myArray = [NSMutableArray array]; for(int i = 0; i < 10; i++) { [myArray addObject:@(i)]; } NSLog(@"myArray:\n%@", myArray); 回答2: This code is not doing what you want it to

问题 So I'm fetching data from a url which is in a json format. I'm trying to display the data in my tableview but, even though it feels simple, I can't figure out how to do it. class CompanyModel { func getJSON() { let companyArray: NSMutableArray = NSMutableArray() let requestURL: NSURL = NSURL(string: "http://localhost/Companies/JSON.php")! let urlRequest: NSMutableURLRequest = NSMutableURLRequest(URL: requestURL) let session = NSURLSession.sharedSession() let task = session.dataTaskWithRequest

问题 i create an array and i initialize it with objects. i tried to get access to the array object but i get a (null). what do i do wrong? photoArray = [[NSMutableArray alloc] init]; PhotoItem *photo1 = [[PhotoItem alloc] initWithPhoto:[UIImage imageNamed:@"1.jpg"] name:@"roy rest" photographer:@"roy"]; PhotoItem *photo2 = [[PhotoItem alloc] initWithPhoto:[UIImage imageNamed:@"2.jpg"] name:@"roy's hand" photographer:@"roy"]; PhotoItem *photo3 = [[PhotoItem alloc] initWithPhoto:[UIImage imageNamed:

问题 I desperately need to sort an array: heres the situation, I need to rearrange / sort and replace arrays based on other an object class from another array. ParentClass :NSObject{ NSString *name; NSNumber *type; } This is the parent class, which fills up the parentArray parentArray = { parentA, parentB, parentC } This is another object class, it has ParentClass *parent. @class ParentClass; EntryClass: NSObject{ NSString *name; NSNumber *number; ParentClass *parent; } Now I have an array

问题 Usually when we want to initialize NSMutableArray we use: NSMutableArray *mArr = [[NSMutableArray alloc] initWithObjects: @"one", @"two", @"three", nil]; But, is it correct to use syntax like: NSMutableArray *mArr = @[@"one", @"two", @"three"].mutableCopy; I understand, that it will work a couple of nanoseconds longer. But I think the second way to be way more readable and I'm ready to sacrifice those nanoseconds. Is it ok, to use this kind of construction? Does ARC clean that unused NSArray,

问题 I have an NSArray that contains nested NSArrays. Im looking for a way to sort the parent array according to the object count of the nested arrays in ascending order. so if [array1 count] is 4, [array2 count] is 2 and [array3 count] is 9, i would get : array2, array1, array3... 回答1: There are a few solutions, one of which is: NSSortDescriptor *sd = [NSSortDescriptor sortDescriptorWithKey:@"@count" ascending:YES]; NSArray *sds = [NSArray arrayWithObject:sd]; NSArray *sortedArray = [array