Can't withdraw CGPoint Values from A mutableArray of NSValue

Question

I made an NSMUtableArray of CGpoints and I stored them by subclassing as NSValue, but I cant get the values out. here I what I did.

 CGPoint graphPoint;
    NSMutableArray *pointValues = [[NSMutableArray alloc] init];

    for( int x =0;x<5; x++)
    {
    NSDictionary* xValue = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:x] forKey:@"X"];
    graphPoint.x =x;
    graphPoint.y = [CalculatorBrain runProgram: self.graphingPoint usingVariableValues:xValue];

    [pointValues addObject:[NSValue valueWithCGPoint:graphPoint]];

}

I tried using this to get the values but I just get null back

for( int x=0; x<5; x++) {
NSValue *val = [pointValues objectAtIndex:x];
CGPoint point = [val CGpointValue];
NSLog(@"Points = %@", point);
}

It's a miracle that code doesn't crash. – Richard J. Ross III Jul 22 '12 at 23:49 — Richard J. Ross III, Jul 22 '12 at 23:49

Richard J. Ross III · Accepted Answer · 2012-07-23T00:03:54.863

3

You can't print a CGPoint using the %@ format specifier, as it is not an object. Instead, use NSStringFromCGPoint():

NSLog(@"%@", NSStringFromCGPoint(myPoint));

edited Jul 23 '12 at 00:03

answered Jul 22 '12 at 23:48

Richard J. Ross III

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seems to work but I get an implicit declaration warning for NSStringFromPoint, is that okay? – Terrel Gibson Jul 22 '12 at 23:52
@TerrelGibson did you include UIKit / AppKit? Your code will probably still work fine, but that warning is never good. – Richard J. Ross III Jul 22 '12 at 23:56
do I just do #include "UIKit / AppKit" because I get a error saying filename not found – Terrel Gibson Jul 23 '12 at 00:01
@TerrelGibson no, you include `UIKit/UIKit.h` (for iOS), or `AppKit/AppKit.h` (for mac). – Richard J. Ross III Jul 23 '12 at 00:02
@JoshCaswell good point, thanks for pointing that out, fixed. – Richard J. Ross III Jul 23 '12 at 00:03

Can't withdraw CGPoint Values from A mutableArray of NSValue

1 Answers1