ios - 重用 UIBezierPath 对象

Question

我想在圆弧下画一个圆弧和圆，我正在使用 UIBezierPath 来做。

但是我只想使用一个 bezierPath，下面的代码似乎是虚拟的。如何将两个 beizerPath 合并为一个并绘制相同的图表？

- (void)drawBackGround {
    UIBezierPath *bgPath = [UIBezierPath bezierPath];
    UIColor *color = [UIColor colorWithHex:BG_ARC_COLOR];
    [color set];
    [bgPath addArcWithCenter:self.center radius:BG_RADIUS startAngle:START_ANGLE endAngle:END_ENGLE clockwise:ANTY_CLOCK_WISE];
    bgPath.lineWidth = BG_ARC_WIDTH;
    bgPath.lineCapStyle = kCGLineCapRound;
    bgPath.lineJoinStyle = kCGLineCapRound;
    [bgPath stroke];
    UIBezierPath *circylePath = [UIBezierPath bezierPath];
    [circylePath moveToPoint:self.center];
    [circylePath addArcWithCenter:self.center radius:BG_CIRCYLE_RADIUS startAngle:0 endAngle:2 * M_PI clockwise:CLOCK_WISE];
    [circylePath addLineToPoint:self.center];
    [circylePath fill];
}

Answer 1

试一试:

UIBezierPath *bgPath = [UIBezierPath bezierPath];
UIColor *color = [UIColor colorWithHex:BG_ARC_COLOR];
[color set];
[bgPath addArcWithCenter:self.center radius:BG_RADIUS startAngle:START_ANGLE endAngle:END_ENGLE clockwise:ANTY_CLOCK_WISE];
bgPath.lineWidth = BG_ARC_WIDTH;
bgPath.lineCapStyle = kCGLineCapRound;
bgPath.lineJoinStyle = kCGLineCapRound;
[bgPath stroke];

[bgPath removeAllPoints];

[bgPath moveToPoint:self.center];
[bgPath addArcWithCenter:self.center radius:BG_CIRCYLE_RADIUS startAngle:0 endAngle:2 * M_PI clockwise:CLOCK_WISE];
[bgPath addLineToPoint:self.center];
[bgPath fill];