【提问】iOS UIAtumator 是怎么判断元素isVisible的？

脚本：

var target = UIATarget.localTarget();

var app = target.frontMostApp();
var window = app.mainWindow();
//window.logElementTree();

var elements = window.elements();

for ( var i = 0; i < elements.length; i++) {
	UIALogger.logMessage("visible:"+elements[i].isVisible());	
}

如图：界面有4个元素，都是可见的。但是打印出来，只有第一个元素的isVisible是true。

接着我尝试了，将源码另外三个的hidden 或 accessibilityElementsHidden 属性设置成YES，打印出的结果，都没有变化。

ps：这个时候，我尝试把第一个UILabel的 hidden 或 accessibilityElementsHidden 属性进行修改，生效了。下边是我的代码：

-(void)draw{
    UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(5.0f, 5.0f, 310.0f, 16.0f)];
    
    title.text = self.itemTitle;
    title.textColor = [UIColor blackColor];
    title.font = [UIFont fontWithName:@"FZZhongDengXian-Z07S" size:16];
    title.backgroundColor = [UIColor clearColor];
    title.accessibilityElementsHidden = YES;
    [self addSubview:title];
    
    //图片
    UIImageView *itemImage =[[UIImageView alloc] initWithFrame:CGRectMake(0, 24,320, 330)];
    NSURL *imageURL = [NSURL URLWithString:self.imageUrl];
    UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:imageURL]];
    
    itemImage.image=image;
    [self addSubview:itemImage];
    
    //价格
    UILabel *name=[[UILabel alloc] initWithFrame:CGRectMake(5.0f,360.0f, 320.0f,14.0f)];
    name.text=[NSString stringWithFormat:@"%@%@",@"价格：￥",self.itemPrice];
    name.font = [UIFont systemFontOfSize:14];
    name.textColor = [UIColor redColor];
    [self addSubview:name];
    
    //描述
    UILabel *description = [[UILabel alloc] initWithFrame:CGRectMake(5.0f, 375.0f, 310.0f, 56.0f)];
    
    description.text = self.itemDescription;
    description.textColor = [UIColor blackColor];
    description.font = [UIFont systemFontOfSize:14.0f];
    description.numberOfLines = 0;//相当于不限制行数
    [self addSubview:description];
    
}