iOS 画图对号

CGPoint pathCenter = CGPointMake(_logoView.frame.size.width/2, _logoView.frame.size.height/2 - 50);

UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:pathCenter radius:Logo_Size startAngle:0 endAngle:M_PI*2 clockwise:YES];

    path.lineCapStyle = kCGLineCapRound;

    path.lineJoinStyle = kCGLineCapRound;

CGFloat x = _logoView.frame.size.width/2.5 + 5;

CGFloat y = _logoView.frame.size.height/2 - 45;

//勾的起点

    [path moveToPoint:CGPointMake(x, y)];

//勾的最底端

CGPoint p1 = CGPointMake(x+10, y+ 10);

    [path addLineToPoint:p1];

//勾的最上端

CGPoint p2 = CGPointMake(x+35,y-20);

    [path addLineToPoint:p2];

//新建图层——绘制上面的圆圈和勾

CAShapeLayer *layer = [[CAShapeLayer alloc] init];

    layer.fillColor = [UIColor clearColor].CGColor;

    layer.strokeColor = [UIColor greenColor].CGColor;

    layer.lineWidth = 5;

    layer.path = path.CGPath;

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:NSStringFromSelector(@selector(strokeEnd))];

    animation.fromValue = @0;

    animation.toValue = @1;

    animation.duration = 0.5;

    [layer addAnimation:animation forKey:NSStringFromSelector(@selector(strokeEnd))];

    [_logoView.layer addSublayer:layer];