nsarray

问题 How come I'm getting the error "NSArray does not have a member named 'removeAtIndex'. How can I fix this? The error is on the fourth last line. Sorry if my question is stupid, I'm fairly new to programming. I appreciate all the help I get. import Foundation let userDefaults = NSUserDefaults.standardUserDefaults() func isAppAlreadyLaunchedOnce()->Bool{ let defaults = NSUserDefaults.standardUserDefaults() if let isAppAlreadyLaunchedOnce = defaults.stringForKey("isAppAlreadyLaunchedOnce"){

问题 Currently I'm trying to set up a search bar for my tableView. I want to filter the user's input with NSPredicate to display filtered data from an array of struct objects. But when I try to call .filteredArrayUsingPredicate() on such an array, I get the following error [Course] is not convertible to 'NSArray' . Below is my code and a link to the repo. I'm also open to any better methods of approach. import UIKit import SwiftyJSON class CourseTableViewController: UITableViewController,

问题 So this is based off of my question here objective c when to use NSDictionary instead of NSArray Apologies for the noob questions. I just started learning objective c and I'm really confused. - (void)viewDidLoad { [super viewDidLoad]; headers = [NSArray arrayWithObjects:@"Header Section 1 (H1)", @"Header Section 2 (H2)", nil]; events = [NSArray arrayWithObjects:@"H1 Content 1", @"H1 Content 2", nil]; myInfo = [NSArray arrayWithObjects:@"H2 Content 1", @"H2 Content 2", @"H2 Content 3", nil];

问题 I use the following code to get to the documents directory. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; Why would my app be crashing with the following message? *** -[__NSArrayI objectAtIndex:]: index 0 beyond bounds for empty array I can't see how my NSArray (immutable array) can be empty. The function is supposed to return the documents folder in an array. Any ideas? 回答1: 1) Are you

问题 An iphone app I'm working on is terminating periodically ... and I have a feeling it is because of how I'm accessing a shared NSArray amongst several view controllers. So ... What is the best way to pass NSArray/NSMutableArray amongst several ViewControllers ... all of which can modify and/or set it to nil or whatever? Thanks 回答1: There are two approaches, generally speaking. In the first approach, when you instantiate your next view controller, you could set an array property to "inherit"

问题 This is kinda confusing so please bear with me. I have an array (listOfStates) of dictionaries. Where listOfStates has this structure: {stateName} - {stateCapital} {Alabama} - {Montgomery} {Alaska} - {Juneau} {Arizona} - {Phoenix} ... {West Virginia} - {Charleston} {Wisconsin} - {Madison} {Wyoming} - {Cheyenne} This is the code used to obtain the 1st letter of each US State(stateName) in order to group them together alphabetically: listOfStates = [[NSArray alloc] init]; stateIndex = [

问题 I'm having issues when trying to pass data to my Apple Watch app through NSUserDefaults from my app. Whenever I try to retrieve the array that is stored, I am getting the error 'String' is not identical to 'AnyObject' . I've been trying to figure out a solution but I can't work out what the issue is since I am using the same method elsewhere in my app and it works without issue. Here is what I have in the Apple Watch part: var defaults = NSUserDefaults(suiteName: "group.AffordIt") tempNames =

问题 I'm having issues when trying to pass data to my Apple Watch app through NSUserDefaults from my app. Whenever I try to retrieve the array that is stored, I am getting the error 'String' is not identical to 'AnyObject' . I've been trying to figure out a solution but I can't work out what the issue is since I am using the same method elsewhere in my app and it works without issue. Here is what I have in the Apple Watch part: var defaults = NSUserDefaults(suiteName: "group.AffordIt") tempNames =

问题 Can anyone tell me why this is NULL ? So Array1 is NSMutable, and has an NSString object "UserName" at index 0; NSLog (@"Contents of array1 %@", [array1 objectAtIndex:0]); //prints UserName Now , I do this... array2 belongs to another class. I reference the class, import .h file, and add property and synthesize it. [object2.array2 addObject: array1]; //array2 is NSMutable properly initialized in it's respective class in the init method NSLog (@"Contents of array2 %@", [object2.array2

问题 I am now using this code: - (void)loadLauncher:(NSMutableArray *)categoriesArray { _launcherView = [[TTLauncherView alloc] initWithFrame:self.view.bounds]; _launcherView.columnCount = 3; // Number of pages in your launcherView. NSMutableArray *pages = [[NSMutableArray alloc] initWithCapacity:2]; int numberOfObjects = [categoriesArray count]; // The launcherItems in each page, calculate automatically the number of objects available for the launcher. NSMutableArray *launcherItems = [