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kutyadog on 09/27/12

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xCode Objective C Array examples

/ Published in: Objective C

Examples of different things you can do with arrays

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[selectedLevels replaceObjectAtIndex:0 withObject:3];
NSLog(@"Count: %i, %@", 0, [selectedLevels objectAtIndex:0]);

NSMutableArray *TempShortArray = [[NSMutableArray alloc] init];
NSLog(@"Count: %i, %@", i, [xTempArray objectAtIndex:i]);
NSLog(@"Count: %i", [xTempArray count]);
gameData[0].stars = 2;

ScoreAndLevelData = [[NSMutableArray alloc] initWithCapacity:10];
[ScoreAndLevelData addObject:TempShortArray];

NSMutableArray *TempShortArray = [[NSMutableArray alloc] init];
[TempShortArray setArray:[[xTempArray objectAtIndex:i] componentsSeparatedByString:@","] ];

//------------------------NSArray
//from http://www.icodeblog.com/2009/08/26/objective-c-tutorial-nsarray/

// I am using strings, but you can add just about any object to an NSArray
 
// Creates an NSArray with one object
NSArray  * myArray = [NSArray arrayWithObject:@"foo"];
 
// Creates an NSArray with multiple objects. Don't forget to add nil as the last object
NSArray  * myArray2 = [NSArray arrayWithObjects:@"foo",@"bar",@"baz",nil];
 
// Creates an NSArray from another NSArray
NSArray * myArray3 = [NSArray arrayWithArray:myArray2];
 
// This will create an NSArray from data on iCodeBlog.  Go ahead and try it out, this file exists on our servers and contains valid data.
NSArray * myArray4 = [NSArray arrayWithContentsOfURL:[NSURL URLWithString:@"http://icodeblog.com/wp-content/uploads/2009/08/foo.plist"]];

NSString * f = @"foo";
NSString * b = @"bar";
NSString * z = @"baz";
NSArray  * myArray2 = [NSArray arrayWithObjects:f,b,z,nil];
NSInteger idx = [myArray2 indexOfObject:b];
// This would return 1 (since NSArrays are 0 - indexed)

// Lets pretend the bullet object has a method called move
// and there is an array of 50 bullets 
[bullets makeObjectsPerformSelector:@selector(move)];

NSArray *sortedArray = [myArray2 sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
    // This will return a sorted array that looks like [@"bar",@"baz",@"foo"]

for(NSString * myStr in myArray2) {
    NSLog(myStr);
}

//save data to file
NSArray  * myArray2 = [NSArray arrayWithObjects:@"foo",@"bar",@"baz",nil];
[myArray2 writeToFile:filePath atomically:YES];

//http://www.techotopia.com/index.php/Working_with_Objective-C_Array_Objects
//--NSArray can not be changed!
NSArray *myColors;
myColors = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil]; //requires the nil at end
NSLog (@"Number of elements in array = %lu", [myColors count]);

//NSMutableArray CAN be changed
NSMutableArray *myColors;
myColors = [NSMutableArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];

//-------
NSArray *myColors;
int i;
int count;
myColors = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];
count = [myColors count];
for (i = 0; i < count; i++)
        NSLog (@"Element %i = %@", i, [myColors objectAtIndex: i]);

//-------
NSArray *myColors;
NSString *color;
myColors = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];
for (color in myColors)
        NSLog (@"Element = %@", color);

//adding
[myColors addObject: @"Indigo"];
[myColors addObject: @"Violet"];
//inserting
[myColors insertObject: @"Indigo" atIndex: 1];
[myColors insertObject: @"Violet" atIndex: 3];

//deleting
[myColors removeObjectAtIndex: 0];
[myColors removeObject: @"Red"];
[myColors removeObjectIdenticalTo: @"Red"];
[myColors removeAllObjects];
[myColors removeLastObject];

//sorting
NSArray *sortedArray;
sortedArray = [myColors sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

//----------DICTIONARY OBJECTS
//Once a relationship between a key and a value has been established that relationship cannot subsequently be modified.
//creating:
NSDictionary *bookListing = [NSDictionary dictionary];
//or changeble
NSMutableDictionary *bookListing = [NSMutableDictionary dictionary];

//populating
[bookListing setObject: @"Wind in the Willows"  forKey: @"100-432112"];
[bookListing setObject: @"Tale of Two Cities " forKey:  @"200-532874"];
[bookListing setObject: @"Sense and Sensibility" forKey:  @"202-546549"];
[bookListing setObject: @"Shutter Island" forKey: @"104-109834"];
//or
NSDictionary *bookListing = [NSDictionary dictionaryWithObjectsAndKeys: @"Wind in the Willows", @"100-432112", @"Tale of Two Cities ", @"200-532874", @"Sense and Sensibility", @"202-546549", @"Shutter Island", @"104-109834", nil];
//or
NSArray *objectsArray = [NSArray arrayWithObjects: @"Wind in the Willows", @"Tale of Two Cities ", @"Sense and Sensibility", @"Shutter Island", nil];
NSArray *keysArray = [NSArray arrayWithObjects: @"100-432112", @"200-532874", @"202-546549", @"104-109834", nil];
NSDictionary *bookListing = [[NSDictionary alloc] initWithObjects: objectsArray forKeys: keysArray];

//------get an entry count
NSMutableDictionary *bookListing = [NSMutableDictionary dictionary];
int count;
[bookListing setObject: @"Wind in the Willows"  forKey: @"100-432112"];
[bookListing setObject: @"Tale of Two Cities " forKey:  @"200-532874"];
[bookListing setObject: @"Sense and Sensibility" forKey:  @"202-546549"];
[bookListing setObject: @"Shutter Island" forKey: @"104-109834"];
NSLog (@"Number of books in dictionary = %lu", [bookListing count]);

//calling the data:
NSLog ( @"100-432112 = %@", [bookListing objectForKey: @"100-432112"]);
NSLog ( @"200-532874 = %@", [bookListing objectForKey: @"200-532874"]);
NSLog ( @"202-546549 = %@", [bookListing objectForKey: @"202-546549"]);
NSLog ( @"104-109834 = %@", [bookListing objectForKey: @"104-109834"]);

//deleting
[bookListing removeObjectForKey: @"104-109834"];
[bookListing removeAllObjects];

//---------use blocks to go through each item of array
NSArray *cards =
    [NSArray arrayWithObjects:@"Jack", @"Queen", @"King", @"Ace", nil];
    
[cards enumerateObjectsUsingBlock:^(id object, NSUInteger index, BOOL *stop) {
    NSLog(@"%@ card at index %d", object, index);
}];

//--------array of ints
[NSArray arrayWithObjects:[ NSNumber numberWithInteger: 1500 ],[ NSNumber numberWithInteger: 1750 ],nil]

//--------accessing array object as int
[[xArray objectAtIndex:x] intValue];

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