IOS @param view 需要获取层级结构的view

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    NSString *str =  [self digView:self.window];
    [str writeToFile:@"/Users/apple/Desktop/ios6.xml" atomically:YES];
}

/**
 *  返回传入veiw的所有层级结构
 *
 *  @param view 需要获取层级结构的view
 *
 *  @return 字符串
 */
- (NSString *)digView:(UIView *)view
{
    if ([view isKindOfClass:[UITableViewCell class]]) return @"";
    // 1.初始化
    NSMutableString *xml = [NSMutableString string];

    // 2.标签开头
    [xml appendFormat:@"<%@ frame=\"%@\"", view.class, NSStringFromCGRect(view.frame)];
    if (!CGPointEqualToPoint(view.bounds.origin, CGPointZero)) {
        [xml appendFormat:@" bounds=\"%@\"", NSStringFromCGRect(view.bounds)];
    }

    if ([view isKindOfClass:[UIScrollView class]]) {
        UIScrollView *scroll = (UIScrollView *)view;
        if (!UIEdgeInsetsEqualToEdgeInsets(UIEdgeInsetsZero, scroll.contentInset)) {
            [xml appendFormat:@" contentInset=\"%@\"", NSStringFromUIEdgeInsets(scroll.contentInset)];
        }
    }

    // 3.判断是否要结束
    if (view.subviews.count == ) {
        [xml appendString:@" />"];
        return xml;
    } else {
        [xml appendString:@">"];
    }

    // 4.遍历所有的子控件
    for (UIView *child in view.subviews) {
        NSString *childXml = [self digView:child];
        [xml appendString:childXml];
    }

    // 5.标签结尾
    [xml appendFormat:@"</%@>", view.class];

    return xml;
}