appendBezierPathWithGlyph在[NSBezierPath currentPoint]中失败 [英] appendBezierPathWithGlyph fails in [NSBezierPath currentPoint]

问题描述

有人在这种情况下会发生这种情况吗？

Has anybody an idea in which case this can happen?

GDB输出：

0 .. 8:  kill, abort, objc_exception_throw etc.
9:  0x00007fff87ea21f4 in +[NSException raise:format:] ()
10: 0x00007fff8694e9e2 in -[NSBezierPath currentPoint] ()
11: 0x00007fff869e3b3b in __NSAppendBezierPathWithGlyphs ()
12: 0x00007fff869e5baf in -[NSBezierPath appendBezierPathWithGlyphs:count:inFont:]()
13: 0x00007fff869e2e2d in -[NSBezierPath appendBezierPathWithGlyph:inFont:] ()

推荐答案

objc_exception_throw 是引发异常的函数。在这种情况下，有两件事要看：控制台日志，它将标识异常本身，以及导致 objc_exception_throw 的调用堆栈。

objc_exception_throw is the function to throw an exception. There are two things to look at in this circumstance: The Console log, which will identify the exception itself, and the call stack leading to objc_exception_throw.

在这种情况下，我可以猜测单独来自调用堆栈的异常是什么：如果路径中没有当前点，则将抛出 currentPoint 。这由 appendBezierPathWithGlyphs：count：inFont：方法（以及您直接调用的方法）：

In this case, I can guess what the exception was from the call stack alone: currentPoint will throw if the path has no current point. This is backed up by the documentation for the appendBezierPathWithGlyphs:count:inFont: method (as well as for the method you're directly calling):

您必须设置路径的当前点（使用 moveToPoint：方法或通过创建前一条直线或曲线段）在调用此方法之前。

You must set the path's current point (using the moveToPoint: method or through the creation of a preceding line or curve segment) before you invoke this method.

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