Comparing two CGRects

Question

I needed to check wether the frame of my view is equal to a given CGRect. I tried doing that like this:

CGRect rect = CGRectMake(20, 20, 20, 20);
if (self.view.frame == rect)
{
    // do some stuff
}

However, I got an error saying Invalid operands to binary expression('CGRect' (aka 'struct CGRect') and 'CGRect'). Why can't I simply compare two CGRects?

score 257 · Accepted Answer · edited Nov 26 '14 at 22:27

257

Use this:

if (CGRectEqualToRect(self.view.frame, rect)) {
     // do some stuff
}

edited Nov 26 '14 at 22:27

Johannes Fahrenkrug

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answered Sep 16 '13 at 03:44

Amelia777

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score 40 · Answer 2 · edited Apr 15 '17 at 10:09

40

See the documentation for CGRectEqualToRect().

bool CGRectEqualToRect ( CGRect rect1, CGRect rect2 );

edited Apr 15 '17 at 10:09

Stunner

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answered Oct 13 '12 at 22:41

James Sumners

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score 6 · Answer 3 · answered Jun 19 '17 at 16:11

6

In the Swift 3 it would be:

frame1.equalTo(frame2)

answered Jun 19 '17 at 16:11

Julian

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2

in fact, `equalTo(_:)` is now [deprecated](https://developer.apple.com/documentation/coregraphics/cgrect/1456516-equalto) so `==` is preferred. – olx May 09 '18 at 05:51

zumzum · Answer 4 · 2018-08-22T22:31:07.723

2

In Swift simply using the == or != operators works for me:

    let rect = CGRect(x: 0, y: 0, width: 20, height: 20)

    if rect != CGRect(x: 0, y: 0, width: 20, height: 21) {
        print("not equal")
    }

    if rect == CGRect(x: 0, y: 0, width: 20, height: 20) {
        print("equal")
    }

debug console prints:

not equal
equal

edited Aug 22 '18 at 22:31

answered Aug 22 '18 at 22:07

zumzum

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Comparing two CGRects

4 Answers4