NSPredicate on an NSArray of CGPoints

Question

I have an NSArray of CGPoints.

I actually want to get the minimal CGRect that contains all the CGPoints in that array. Is there already any iOS function to do this?

Otherwise I will have to manually fetch minX, maxX, minY, maxY, and construct my CGRect this way:

CGrectMake(minX, minY, maxX-minX, maxY-minY);

For this I need to filter the NSArray with an NSPredicate.

(I know, I could filter the array manually, but come on!...)

Answer 1

There is no public API that does what you're asking. You'll have to write it yourself.

It wouldn't be appropriate for NSPredicate anyway. A predicate is for filtering values, not for constructing new values.

CGRect boundsOfPointArray(NSArray *array) {
    CGRect bounds = CGRectNull;
    for (NSValue *wrapper in array) {
        CGRect r = (CGRect){ wrapper.CGPointValue, CGSizeZero };
        bounds = CGRectUnion(bounds, r);
    }
}