获取到某控件（视图）其subviews中某个控件的所有对象

参考地址：http://www.glimsoft.com/01/07/how-to-inspect-subviews-hierarchy-of-any-uiview/

下面以获取到视图上所有按钮（使用中可以作为参数）为例：

1.创建UIView 的category

import "UIView+SearchButtonAndTextInSubViews.h"

2.//获取子视图中的所有button、这里数组需要传进来空数组

- (NSArray *)searchButtonInSubViewsWithArray:(NSMutableArray *)array
{
    if (!array)
    {
        array = [[NSMutableArray alloc] init];
    }
    
    NSArray *subViews = [self subviews];
    
    for (int i = 0; i < subViews.count; i++)
    {
        id  currentSubView = [subViews objectAtIndex:i];
        
        //是button的话
        if ([currentSubView isKindOfClass:[UIButton class]])
        {
            UIButton *button = (UIButton *)currentSubView;
            [array addObject:button];
        }
        //不是的话去subviews找
        if ([currentSubView isKindOfClass:[UIView class]])
        {
            [currentSubView searchButtonInSubViewsWithArray:array];
        }

    }
    return array;
}