nsarray

As above. Would be helpful to know. Thanks! Here are two options: - (NSMutableArray *)createMutableArray1:(NSArray *)array { return [NSMutableArray arrayWithArray:array]; } - (NSMutableArray *)createMutableArray2:(NSArray *)array { return [[array mutableCopy] autorelease]; } Use -mutableCopy and make sure to balance the retain count. NSMutableArray *mutableArray = [[immutableArray mutableCopy] autorelease]; dhaya Try this one NSMutableArray *array = [[NSMutableArray alloc]initWithArray:your_array_name]; 来源： https://stackoverflow.com/questions/3222122/converting-nsarray-to-nsmutablearray

I made a mistake while creating a TableView class , and accidentally kept my @property as copy when I defined it: @property (copy, nonatomic) NSMutableArray *words; I initialised the array "correctly": (note this is the third attempt, so please ignore the fact that I'm not using mutableCopy and other better ways of doing this) NSArray *fixedWords = @[@"Eeny", @"Meeny", @"Miny", @"Moe", @"Catch", @"A", @"Tiger", @"By", @"His", @"Toe"]; NSMutableArray *mutWords = [[NSMutableArray alloc] initWithArray:fixedWords]; self.words = mutWords; However when I later came to reorder the array, it crashed

I'm dealing with deeply nested NSArray's and NSDictionary's and it's very time consuming to say the least. [data objectatindex:0] valueForKey:@"blah"] etc etc Does anyone know of a nice iOS category to recursively log the structure, highlight the type and show the values? Might be asking a bit much but you never know :) Maybe like this? for (id key in dictionary) { NSLog(@"key: %@, value: %@ \n", key, [dictionary objectForKey:key]); } but i can't think of any nice way of getting the output beautiful except copy & paste it into a jsonFormatter (for example) EDIT : @Andrey Starodubtsev has the

Is there any convenient way to take an array/set of objects and create a new array/set containing some property of each item in the first array? For example, an array contains Car objects. I need an array of licensePlates, where each car has an NSObject car.licensePlate. Currently I just iterate through the first array adding objects to my mutable results array, but was wondering if there is an instantiation method that exists for this (checked the docs for NSArray). This will return an array containing the value of licensePlate from each item in the myCars array: NSArray *licensePlates =

I'm able to put the contents of an NSSet into an NSMutableArray like this: NSMutableArray *array = [set allObjects]; The compiler complains though because [set allObjects] returns an NSArray not an NSMutableArray . How should this be fixed? 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]; I resolved crashing by using NSMutableArray's method 'addObjectsFromArray' to assign all

I have a NSMutableArray whose count is 10 and I want to extract the last 5 values and store them in another array. How can I do this? I think that - (NSArray *) subarrayWithRange:(NSRange)range ( doc ) might help you. NSRange theRange; theRange.location = [wholeArray count] - 5; theRange.length = 5; NSArray *result = [wholeArray subarrayWithRange:theRange]; EDIT : Be careful to check that your array has at least five elements, else, subarrayWithRange will throw an exception. Use following way : NSMutableArray *first = [[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@

.h @property (nonatomic, strong) NSMutableDictionary * products; //not synthesized in .m .m - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response { NSLog(@"Loaded list of products..."); _productsRequest = nil; NSArray * skProducts = response.products; for (SKProduct * skProduct in skProducts) { IAPProduct * product = _products[skProduct.productIdentifier]; product.skProduct = skProduct; product.availableForPurchase = YES; } for (NSString * invalidProductIdentifier in response.invalidProductIdentifiers) { IAPProduct * product = _products