nsmutablearray – Page 4

How to save NSMutablearray in NSUserDefaults

March 9, 2023 by Tarik

Note: NSUserDefaults will always return an immutable version of the object you pass in. To store the information: // Get the standardUserDefaults object, store your UITableView data array against a key, synchronize the defaults NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; [userDefaults setObject:arrayOfImage forKey:@”tableViewDataImage”]; [userDefaults setObject:arrayOfText forKey:@”tableViewDataText”]; [userDefaults synchronize]; To retrieve the information: NSUserDefaults *userDefaults = [NSUserDefaults … Read more

Objective-C Simplest way to create comma separated string from an array of objects

March 4, 2023 by Tarik

Use the NSArray instance method componentsJoinedByString:. In Objective-C: – (NSString *)componentsJoinedByString:(NSString *)separator In Swift: func componentsJoinedByString(separator: String) -> String Example: In Objective-C: NSString *joinedComponents = [array componentsJoinedByString:@”,”]; In Swift: let joinedComponents = array.joined(seperator: “,”)

NSMutableArray – force the array to hold specific object type only

February 28, 2023 by Tarik

Update in 2015 This answer was first written in early 2011 and began: What we really want is parametric polymorphism so you could declare, say, NSMutableArray<NSString>; but alas such is not available. In 2015 Apple apparently changed this with the introduction of “lightweight generics” into Objective-C and now you can declare: NSMutableArray<NSString *> *onlyStrings = … Read more

NSMutableArray addObject: -[__NSArrayI addObject:]: unrecognized selector sent to instance

February 27, 2023 by Tarik

The synthesized setter for @property (copy) sends a copy message to the array, which results in an immutable copy. You have no choice but the implement the setter yourself here, as detailed in the Objective-C guide.

‘Invalid update: invalid number of rows in section 0

February 6, 2023 by Tarik

You need to remove the object from your data array before you call deleteRowsAtIndexPaths:withRowAnimation:. So, your code should look like this: // Editing of rows is enabled – (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { //when delete is tapped [currentCart removeObjectAtIndex:indexPath.row]; [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } } You can also simplify … Read more

Adding an object at a specific index of an NSMutableArray

January 22, 2023 by Tarik

[myMutableArray insertObject:myObject atIndex:42]; To add an object to the front of the array, use 0 as the index: [myMutableArray insertObject:myObject atIndex:0];

How to return an NSMutableArray from an NSSet

January 3, 2023 by Tarik

Since -allObjects returns an array, you can create a mutable version with: NSMutableArray *array = [NSMutableArray arrayWithArray:[set allObjects]]; Or, alternatively, if you want to handle the object ownership: NSMutableArray *array = [[set allObjects] mutableCopy];

How to store CGRect values in NSMutableArray?

December 25, 2022 by Tarik

You need to wrap the CG structures in NSValue classes. So: NSMutableArray* array = [NSMutableArray mutableArray]; [array addObject:[NSValue valueWithCGRect:CGRectMake(0,0,10,10)]]; CGRect someRect = [[array objectAtIndex:0] CGRectValue];

Join an Array in Objective-C

December 13, 2022 by Tarik

NSArray *array1 = [NSArray arrayWithObjects:@”1″, @”2″, @”3″, nil]; NSString *joinedString = [array1 componentsJoinedByString:@”,”]; componentsJoinedByString: will join the components in the array by the specified string and return a string representation of the array.

The best way to remove duplicate values from NSMutableArray in Objective-C?

November 20, 2022 by Tarik

Your NSSet approach is the best if you’re not worried about the order of the objects, but then again, if you’re not worried about the order, then why aren’t you storing them in an NSSet to begin with? I wrote the answer below in 2009; in 2011, Apple added NSOrderedSet to iOS 5 and Mac … Read more