iOS-添加新手操作指引

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找了许久都没找到好用的操作指引代码，终于有参考的了，下面上代码：

    //先创建一个与主屏幕同样大小的半灰色背景（其实是个长方形）
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, DZScreenWidth, DZScreenHeight)];

    //接着在这个路径下继续加其它路径：椭圆形的路径
    [path appendPath:[[UIBezierPath bezierPathWithOvalInRect:maskFrame] bezierPathByReversingPath]];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    shapeLayer.path = path.CGPath;

    [btn.layer setMask:shapeLayer];

//可以将你想加的提示啊什么加上
    UIImage *image  = DZImageNameWith(imageStr, @"png");
    UIImageView *imgaeView  =  [[UIImageView alloc] initWithImage:image];
    imgaeView.centerX = centerX;
    imgaeView.y = LabelY;
    self.helpImageView = imgaeView;
    [btn addSubview:imgaeView];

实际的效果是：