CGRectContainsRect Not Working

问题

I'm having problems with this method. I have two rectangles that are obviously contained within each other.(I've even graphed their coordinates manually to make sure.) When I use CGRectContainsRect to compare these two rectangles, it returns false. For the life of me, I have tried everything, scoured the net, and I can't find an answer to this problem. Anyone have any idea why? I've included the values for the CGRects when I debug to show that they are definitely within each other.

-(bool)checkBoundingBox {
    bool returnItem = YES;

    //Checks for sprite interaction
    for (int i = 0; i < [arrGameItems count]; i++) {
        CGRect rect2 = [[self getChildByTag:1] boundingBox];
        CGRect rect1 = [[self getChildByTag:3] boundingBox];

        //        rect1 = CGRectStandardize(rect1);
        //        rect2 = CGRectStandardize(rect2);

        if (CGRectContainsRect(rect2, rect1)) {
            CCLOG(@"removed child b*&ch");
            [self removeChildByTag:[arrGameItems count] cleanup:YES];
            returnItem = NO;
        }
    }   

    CCLOG(@"g-dammit");    
    return returnItem;
}

rect1 origin x = 141 y = 76, height = 25, width = 25

rect2 origin x = 127 y = 91, height = 25, width = 25

回答1:

CGRectContainsRect() checks if one rectangle completely encompasses another, not just if they intersect. From your coordinates, the rectangles don't contain each other, but just intersect. You're looking for CGRectIntersectsRect().

回答2:

rect1 does not contain rect2 in your example.

Rect 1 x coordinates span from 141 to 166. Rect 2 x coordinates span from 127 to 152.

Therefor, rect2 is not contained within rect1 (because rect2 exists within x coordinates 127-140, and rect1 does not exist in those coordinates).

来源：https://stackoverflow.com/questions/8981931/cgrectcontainsrect-not-working

标签

iphone

objective-c

cgrect