比如在 CGContextAddPath(ctx, 需要用到path.CGPath);
然而 在 NSBezierPath 中并没有 path.CGPath
修改为:
CGContextAddPath(ctx, [self CGPathFromPath:path]);
转换方法:CGPathFromPath 如下
- (CGMutablePathRef)CGPathFromPath:(NSBezierPath *)path
{
CGMutablePathRef cgPath = CGPathCreateMutable();
NSInteger n = [path elementCount];
for (NSInteger i = 0; i < n; i++) {
NSPoint ps[3];
switch ([path elementAtIndex:i associatedPoints:ps]) {
case NSMoveToBezierPathElement: {
CGPathMoveToPoint(cgPath, NULL, ps[0].x, ps[0].y);
break;
}
case NSLineToBezierPathElement: {
CGPathAddLineToPoint(cgPath, NULL, ps[0].x, ps[0].y);
break;
}
case NSCurveToBezierPathElement: {
CGPathAddCurveToPoint(cgPath, NULL, ps[0].x, ps[0].y, ps[1].x, ps[1].y, ps[2].x, ps[2].y);
break;
}
case NSClosePathBezierPathElement: {
CGPathCloseSubpath(cgPath);
break;
}
default: NSAssert(0, @"Invalid NSBezierPathElement");
}
}
return cgPath;
}
最后笔者换了实现方法 ,此方法未验证,不过该方法得来不易,特此记录。