我想繪製一個貝塞爾曲線可可,我得到一個EXC_BAD_INSTRUCTION似乎沒有任何意義。addCurveToPoint崩潰與EXC_BAD_INSTRUCTION
這裏是我的代碼:
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];
我的應用程序崩潰時,執行以下行:
[path addCurveToPoint: b controlPoin1:c1 controlPoint2:c2];
而且Xcode的告訴我崩潰在我的主循環:
[NSApp runModalSession:modalSession];
錯誤輸出如下:
2016-12-08 04:38:35.344601 unit_tests[10606:777278] -[NSBezierPath addCurveToPoint:controlPoint1:controlPoint2:]: unrecognized selector sent to instance 0x100428fa0
(LLDB)
我強烈懷疑調用堆棧是 「完全無用」:它張貼,讓潛在的幫助決定呢? –
編輯了這個問題,以包含輸出 – megamau
這不是一個堆棧跟蹤,但是,這是一條線。剩下的痕跡在哪裏? –