addCurveToPoint crashing with EXC_BAD_INSTRUCTION

Question

我正在尝试在可可中绘制一个比较曲线的曲线，而我得到的exc_bad_instruction似乎根本没有任何意义。

这是我的代码：

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];

执行以下行时我的应用程序崩溃：

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

和Xcode告诉我它在我的主循环中崩溃：

[NSApp runModalSession:modalSession];

错误输出如下：

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

（lldb）

Answer 1

您有一个带有 controlPoin1: c1的错别字，应该是 controlPoint1: c1

实际上我刚刚意识到您是针对AppKit（NSBezierPath）而不是Uikit（Uibezierpath）。

编辑：

用于AppKit使用：-[NSBezierPath curveToPoint: controlPoint1: controlPoint2:]

用于UIKIT使用-[UIBezierPath addCurveToPoint: controlPoint1: controlPoint2:]