iOS开发笔记－圆滑的曲线

直接上代码：

            UIBezierPath * bPath = [[UIBezierPath alloc]init];
            [bPath setLineCapStyle:kCGLineCapRound];
            [bPath setLineJoinStyle:kCGLineJoinRound];
            [bPath setLineWidth:3.];
            [[UIColor redColor]setStroke];
            for (int i=0; i < line.points.count; i++) {
                CGPoint p = [line.points[i] CGPointValue];
                if (i==0) {
                    //3.把画笔移动到某一个点
                    [bPath moveToPoint:p];
                }else{
                    //4.添加一条线到某一个点
                    CGPoint prePoint = [line.points[i-1] CGPointValue];
                    CGPoint midP = [self calculateMidPointForPoint:p andPoint:prePoint];
                    [bPath addQuadCurveToPoint:midP controlPoint:prePoint];

                }
                
            }
            [bPath stroke];

<pre name="code" class="objc">- (CGPoint)calculateMidPointForPoint:(CGPoint)p1 andPoint:(CGPoint)p2 {
    return CGPointMake((p1.x + p2.x) / 2.0, (p1.y + p2.y) / 2.0);
}