How do I add a CGPoint to NSMutableArray?

Question

I want to store my CGPoint to the NSMutable Array, so , I have method like this:

[self.points addObject:CGPointMake(x, y)];

But I got the error

Answer 1

A simple way to handle CGPoint (or any other non NSObject inherited structure) is to create a new class inherited from NSObject.

The code is longer, but clean. An example is below:

In .h file:

@interface MyPoint:NSObject
{
     CGPoint myPoint;   
}

- (id) init;
- (id) Init:(CGPoint) point;
- (BOOL)isEqual:(id)anObject;

@end

In .m file:

@implementation MyPoint
- (id) init
{
    self = [super init];
    myPoint = CGPointZero;
    return self;
}
- (id) Init:(CGPoint) point{
    myPoint.x = point.x;
    myPoint.y = point.y;
    return self;
}
- (BOOL)isEqual:(id)anObject
{
    MyPoint * point = (MyPoint*) anObject;
    return CGPointEqualToPoint(myPoint, point->myPoint);
}

@end

Here is some code sample showing the usage, do not forget to release!!!

//init the array
NSMutableArray *pPoints;
pPoints = [[NSMutableArray alloc] init];

// init a point
MyPoint *Point1 = [[MyPoint alloc]Init:CGPointMake(1, 1)];


// add the point to the array
[pPoints addObject:[[MyPoint alloc] Point1]];

//add another point
[Point1 Init:CGPointMake(10, 10)];
[pPoints addObject:[[MyPoint alloc] Point1]];

[Point1 Init:CGPointMake(3, 3)];
if ([pPoints Point1] == NO))
   NSLog(@"Point (3,3) is not in the array");

[Point1 Init:CGPointMake(1, 1)];
if ([pPoints Point1] == YES))
   NSLog(@"Point (1,1) is in the array");