please fix!
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it seems y-axis has flipped.
如果这个UIbezierPath创建时对称于y轴，再将其变换回来，则结果是正确的，此时UIbezierPath有正确的位置，且有正确的shader。
So weird, I don't know it's a feature or a bug.
It may affects thounds of apps.
Please check.
Thank you!
for circle paths, besides the method mentioned above, 4pi angle rather than 2pi angle should alose be applied, a negative radius should also be applied.
I don't know why.
It's weird. It just makes no sense.
Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. Please file a bug report, include a small Xcode project and some directions that can be used to reproduce the problem, and post the Feedback number here once you do. If you post the Feedback number here I'll check the status next time I do a sweep of forums posts where I've suggested bug reports.
Bug Reporting: How and Why? has tips on creating your bug report.