NSLog with CGPoint data

Question

I have a CGPoint called point that is being assigned a touch:

UITouch *touch = [touches anyObject];

CGPoint point = [touch locationInView:self];

I want to get the x coordinate value into my console log:

NSLog(@"x: %s", point.x);

When I use this, log output for this is:

x: (null)

I have verified that point is not null when this is called using the debugger and variable watch.

Any help appreciated,

Thanks // :)

score 261 · Accepted Answer · answered Sep 25 '09 at 12:07

261

Actually, the real easiest way to log a CGPoint is:

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

The desktop Cocoa equivalent is NSStringFromPoint().

answered Sep 25 '09 at 12:07

Jens Ayton

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This is even better. The first answer is the easiest and lightest weight way. But this gets me both x and y from the CGPoint in one set. Nice :) Great tool :) – Spanky Sep 25 '09 at 18:29
Since StackOverflow saw fit to reintroduce this question in my RSS feed, I may as well pimp my general solution: http://jens.ayton.se/blag/almost-elegant-cave-man-debugging/ which allows you to go `JA_DUMP(point);` and get “point = { 43, 96 }” logged without having to worry about format codes. – Jens Ayton Sep 06 '10 at 20:06
How do I use your lib since it compiles on I386 but not on ARM? I mean, how can I work on iOS projects using it? – Dan Rosenstark Nov 22 '10 at 18:00
First, you’d need to build the FindAlignment.c file as an iOS app and run it on a device (not simulator). Then, copy the result into a new #elif block before the #else at line 172 in JAValueToString.m. If this doesn’t work, additional debugging will be required. I can’t do it since I’m not in the iOS programme. – Jens Ayton Nov 23 '10 at 07:52
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Also worth noting that NSStringFromCGRect() exists too. – djskinner Dec 08 '12 at 13:10
you can this helper to keep code clean #define CGLog(a) NSLog(@"%@", NSStringFromCGPoint(a)) – johndpope Mar 02 '13 at 05:52

score 24 · Answer 2 · answered Sep 25 '09 at 10:25

24

point.x is a floating point number, so you should use:

NSLog(@"x: %f", point.x);

answered Sep 25 '09 at 10:25

Philippe Leybaert

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score 9 · Answer 3 · answered Sep 25 '09 at 10:35

The simplest way to log a CGPoint value is to use the NSValue class, since it will give you all the relevant values formatted nicely for the console. It's done like so:

NSLog(@"myPoint = %@", [NSValue valueWithCGPoint:myPoint]);

You can also use the +valueWithCGRect and +valueWithCGSize methods of NSValue when you're trying to log, say, the frame (CGRect) or size (CGSize) properties of a UIView.

score 2 · Answer 4 · answered Nov 12 '10 at 11:19

2

NSLog(@"point x,y: %f,%f", point.x, point.y);

answered Nov 12 '10 at 11:19

Nicki

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score 0 · Answer 5 · edited Oct 24 '12 at 05:14

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point.x is a floating point number so you should code like this:

NSLog(@"%@",[NSString StringWithFormat:@"%f",point.x]);

edited Oct 24 '12 at 05:14

Arun

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answered Sep 06 '10 at 13:40

If u want to String value means u just use this!! – Sep 07 '10 at 06:38
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You're doing an unnecessary format string within a format string. Philippe's and Ahruman's approaches are much simpler and they achieve the exact same results. – Brad Larson Oct 29 '10 at 17:27

score 0 · Answer 6 · answered May 22 '16 at 21:22

0

use :

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

You can also use NSString for following info :

NSStringFromCGPoint
NSStringFromCGSize
NSStringFromCGRect
NSStringFromCGAffineTransform
NSStringFromUIEdgeInsets

answered May 22 '16 at 21:22

Ash

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score 0 · Answer 7 · answered May 05 '22 at 14:13

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Latest syntax:

NSLog("%@", NSCoder.string(for: point!))

answered May 05 '22 at 14:13

Edward Hasted

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NSLog with CGPoint data

7 Answers7

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