iOS 圆环带间隔效果

UIButton *WalkingImageView = [[UIButton alloc]initWithFrame:CGRectMake(30, 0,45, 45)];
WalkingImageView.image=imageNamed(@"walkHomeIcon");
WalkingImageView.centerY=self.height/2.0;
[self addSubview:WalkingImageView];

    CAShapeLayer * line = [CAShapeLayer layer];
    CGMutablePathRef path = CGPathCreateMutable();
    line.fillColor = [UIColor clearColor].CGColor;
    line.strokeColor = rgb(190, 190, 190).CGColor;
    line.lineWidth = 10.0f;//长度

    float addwidth=27+15;//圆环比走路图标大多少

    
    CGPathAddEllipseInRect(path, nil, CGRectMake(-addwidth/2.0, -addwidth/2.0, WalkingImageView.width+addwidth, WalkingImageView.height+addwidth));
    line.path = path;
    line.lineDashPhase = 1.0;
    line.lineDashPattern = @[@1,@5];//@1：宽度 @5：间隔
    [WalkingImageView.layer addSublayer:line];