Autoresize UIView to fit subviews

@interface UIView (resizeToFit)

-(void)resizeToFitSubviews;
-(void)resizeHightToFitSubviews;
-(void)resizeWidthToFitSubviews;
@end

@implementation UIView (resizeToFit)

-(void)resizeToFitSubviews
{
    float w = 0;
    float h = 0;

    for (UIView *v in [self subviews]) {
        float fw = v.frame.origin.x + v.frame.size.width;
        float fh = v.frame.origin.y + v.frame.size.height;
        w = MAX(fw, w);
        h = MAX(fh, h);
    }
    [self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, w, h)];
}

-(void)resizeHightToFitSubviews{
    float h = 0;
    for (UIView *v in [self subviews]) {
        float fh = v.frame.origin.y + v.frame.size.height;
        h = MAX(fh, h);
    }
    [self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, h)];
}

-(void)resizeWidthToFitSubviews{
    float w = 0;

    for (UIView *v in [self subviews]) {
        float fw = v.frame.origin.x + v.frame.size.width;
        w = MAX(fw, w);
    }
    [self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, w, self.frame.size.height)];
}

@end

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Code is worth a billion words. Here is the solution:

@interface UIView (UIView_Expanded)

- (void)resizeToFitSubviews;

@end

@implementation UIView (UIView_Expanded)

- (void)resizeToFitSubviews
{
    // 1 - calculate size
    CGRect r = CGRectZero;
    for (UIView *v in [self subviews])
    {
        r = CGRectUnion(r, v.frame);
    }

    // 2 - move all subviews inside
    CGPoint fix = r.origin;
    for (UIView *v in [self subviews])
    {
        v.frame = CGRectOffset(v.frame, -fix.x, -fix.y);
    }

    // 3 - move frame to negate the previous movement
    r = CGRectOffset(r, fix.x, fix.y);

    [self setFrame:r];
}

@end