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问题： iOS UIBezierPath画线如何删除已有的线
描述:
解决方案1:
描述:
生成线的代码：
self.path = [UIBezierPath bezierPath];
[self.path moveToPoint:from];
[self.path addLineToPoint:to];
self.pathLayer = [CAShapeLayer layer];
self.pathLayer.frame = containerView.bounds;
self.pathLayer.path = self.path.CGPath;
self.pathLayer.strokeColor = color.CGColor;
self.pathLayer.lineWidth = 2.0f;
self.pathLayer.lineJoin = kCALineJoinBevel;
NSMutableArray *ary = [NSMutableArray arrayWithArray:shapeLayers];
[ary addObject:self.pathLayer];
shapeLayers = [NSMutableArray arrayWithArray:ary];
[containerView.layer addSublayer:self.pathLayer];如何将上述线删除，在画新线
解决方案1:
self.pathLayer = [CAShapeLayer layer];之前加上
if (self.pathLayer) {
[self.pathLayer removeFromSuperlayer];
}