How do I check if a CGPoint has been initialised?

Question

I would like to initially set a CGPoint property to a particular point (middle of screen). Other methods may subsequently wish to change this property. My thoughts were to initi

Answer 1

static CGPoint kInvalidPoint = {.x = NSIntegerMax, .y = NSIntegerMax};

@implementation MyClass

- init()
{
    self = [super init];
    if (self) {
        _oldPoint = kInvalidPoint;
    }
    return self;
}

- (void)foo
{
    if (CGPointEqualToPoint(self.oldPoint, kInvalidPoint)) {
        // Invalid point.
        return;
    }
}

@end