NSLog with CGPoint data

Thursday, March 8, 2012

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 // :)

UserMarch 8, 2012 at 11:36 PM
Actually, the real easiest way to log a CGPoint is:

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

The desktop Cocoa equivalent is NSStringFromPoint().
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UserMarch 8, 2012 at 11:36 PM
point.x is a floating point number, so you should use:

NSLog(@"x: %f", point.x);
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UserMarch 8, 2012 at 11:36 PM
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.
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UserMarch 8, 2012 at 11:36 PM
point.x is a floating point number, so you should use:

NSLog(@"%@",[NSString StringWithFormat:@"%f",point.x]);
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UserMarch 8, 2012 at 11:36 PM
NSLog(@"point x,y: %f,%f", point.x, point.y);
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