nsmutablearray

I come from a Java background and I am learning Objective C. I am trying to create a class that has a string array and a member function to modify the Array. My code looked like this: @implementation TAWChapter @synthesize mSubject; @synthesize mItems; - (id) init{ self.mItems = [[NSMutableArray alloc] init]; return self; } - (void) setSubject:(NSString *)subject{ self.mSubject = subject; } - (void) addItem:(NSString *)item{ [self.mItems addObject:@"asdf"]; } @end Which didn't work. I got a "[__NSArrayI addObject:]: unrecognized selector sent to instance " and a "NSInvalidArgumentException" .

// 联系人 : 石虎 QQ: 1224614774 昵称 : 嗡嘛呢叭咪哄 面试题 : 怎样把两个有序数组合并成有序数组呢 逻辑步骤 : 1. 假设两个数组为 A 和 B 2.A 和 B 都是从小到大的顺序进行排列 ** 1. 我们可以直接比较两个数组的首元素，哪个小就把这个小元素放入可变数组。 2. 把小元素所在的数组中的这个元素删除。 3. 继续比较两个数组中的首元素，直到有一个数组为空。那么就停止进行比较。把另外一个不空的数组元素全部放入可变数组中即可。 实现代码： - (void)viewDidLoad { [super viewDidLoad]; // 实例化数组 A NSMutableArray *arrA = [NSMutableArray arrayWithArray:@[@1,@3,@5,@7,@9,@11]]; // 实例化数组 B NSMutableArray *arrB = [NSMutableArray arrayWithArray:@[@8,@15,@17,@20,@22,@35]]; //新数组 NSMutableArray *marr = [NSMutableArray array]; //开始遍历 for(int i = 0; i< 100; i++) { if (arrA[0] < arrB[0]) { [marr addObject:arrA

What i'm trying to accomplish is to have an NSMutableArray defined in the AppDelegate. I then have two UIViewControllers. One view is responsible for displaying the array from the AppDelegate. The other view is used to add items to the array. So the array starts out to be empty. View1 doesn't display anything because the array is empty. The User goes to View2 and adds an item to the array in AppDelegate. Then when the user goes back to View1 it now displays one item. Here is how I'm trying to accomplish this @interface CalcAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window;

I'm having trouble with a snippet of code. I'm trying to add an instance of CLLocationCoordinate2D to a NSMutable array using the addObject method, but whenever the line is executed, my app crashes. Is there anything obvious wrong with this code? The crash is on this line: [points addObject:(id)new_coordinate]; Polygon.m: #import "Polygon.h" @implementation Polygon @synthesize points; - (id)init { self = [super init]; if(self) { points = [[NSMutableArray alloc] init]; } return self; } -(void)addPointLatitude:(double)latitude Longitude:(double)longitude { NSLog(@"Adding Coordinate: [%f, %f] %d"

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <array> <array> <string>Title 1</string> <string>Subtitle 1</string> <string>image1.png</string> </array> <array> <string>Title 2</string> <string>Subtitle 2</string> <string>image2.png</string> </array> </array> </plist> This is my Plist file for an app I am working on. I am not sure on how to take the first string of many arrays to create an NSMutableArray with all the titles and again for the subtitles and image names. My

I'm trying to build a nested array: First, I make a "PlayerItems" array which will contain 10 arrays, each containing item objects, corresponding to the inventories of each player in the game. On the indicated line, I get the following error: error: void valued not ignored as it ought to be What is the void value here? If I used [[PlayerItems objectAtIndex:i] addObject:myitem] instead, the program compiles but crashes. If I comment that line out, it compiles and runs OK. Thank you for your help! self.PlayerItems = [[NSMutableArray alloc] initWithCapacity:11]; NSMutableArray *itemarray = [