cocoabeziernsbezierpath

addCurveToPoint crashing with EXC_BAD_INSTRUCTION

I'm trying to draw a bezier curve in cocoa and I'm getting a EXC_BAD_INSTRUCTION that doesn't seem to make any sense at all.

here's my code:

NSBezierPath *path = [NSBezierPath bezierPath];
[path setLineWidth: 1.0f];

NSPoint a = NSMakePoint(0, 0);
NSPoint c1 = NSMakePoint(0, 50);
NSPoint c2 = NSMakePoint(50, 100);
NSPoint b = NSMakePoint(100, 100);

[path moveToPoint:a];
[path addCurveToPoint: b controlPoint1:c1 controlPoint2:c2];

[[NSColor colorWithDeviceRed:1 green:0 blue:0 alpha:1] set];

[path stroke];

My application crashes when the following line is executed:

[path addCurveToPoint: b controlPoin1:c1 controlPoint2:c2];

And Xcode tells me it crashes in my main loop:

[NSApp runModalSession:modalSession];

The error output is the following:

2016-12-08 04:38:35.344601 unit_tests[10606:777278] -[NSBezierPath addCurveToPoint:controlPoint1:controlPoint2:]: unrecognized selector sent to instance 0x100428fa0

(lldb)

Solution

  • You have a typo with controlPoin1: c1 It should be controlPoint1: c1

    Actually I've just realised you're targeting AppKit (NSBezierPath) not UIKit (UIBezierPath).

    Edit:

    For AppKit use: -[NSBezierPath curveToPoint: controlPoint1: controlPoint2:]

    For UIKit use -[UIBezierPath addCurveToPoint: controlPoint1: controlPoint2:]