解决TalbleView头部或底部子控件不显示问题

在自定义cell头部控件UITableViewHeaderFooterView（和自定义cell的方法几乎一样）时，出现了头部控件子控件不显示的问题。

注意和自定义cell的区别。

.h文件

 #import <UIKit/UIKit.h>
 #import "CHModleGroup.h"
 @interface HeaderView : UITableViewHeaderFooterView
 @property (nonatomic, weak) UILabel *count;
 @property (nonatomic, weak) UIButton *name;
 + (instancetype)headerViewWithTableView:(UITableView *)tableView;
 
 @property (nonatomic, strong) CHModleGroup *group;
 
 @end

.m文件

 #import "HeaderView.h"
 
 @implementation HeaderView
 + (instancetype)headerViewWithTableView:(UITableView *)tableView{
     static NSString *ID = @"header";
     HeaderView *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:ID];
     if (header == nil) {
         header = [[HeaderView alloc]initWithReuseIdentifier:ID];
     }
     return header;
 }
 
 - (id)initWithReuseIdentifier:(NSString *)reuseIdentifier
 {
     if (self = [super initWithReuseIdentifier:reuseIdentifier]) {
         UIButton *nameView = [UIButton buttonWithType:UIButtonTypeCustom];
         // 背景图片
         [nameView setBackgroundImage:[UIImage imageNamed:@"发布新闻背景副本"] forState:UIControlStateNormal];
         [nameView setBackgroundImage:[UIImage imageNamed:@"welcome3"] forState:UIControlStateHighlighted];
         // 设置按钮内部的左边箭头图片
         [nameView setImage:[UIImage imageNamed:@"buddy_header_arrow副本"] forState:UIControlStateNormal];
         [nameView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
         // 设置按钮的内容左对齐
         nameView.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
         // 设置按钮的内边距
         //        nameView.imageEdgeInsets
         nameView.titleEdgeInsets = UIEdgeInsetsMake(, , , );
         nameView.contentEdgeInsets = UIEdgeInsetsMake(, , , );
         [self.contentView addSubview:nameView];
         self.nameView = nameView;
 
         // 2.添加好友数
         UILabel *countView = [[UILabel alloc] init];
         countView.textAlignment = NSTextAlignmentRight;
         countView.textColor = [UIColor grayColor];
         [self.contentView addSubview:countView];
         self.countView = countView;
 
     }
         return self;
     }
 
 /**
  *  当一个控件的frame发生改变的时候就会调用
  *
  *  一般在这里布局内部的子控件(设置子控件的frame)
  */
 - (void)layoutSubviews
 {
     //一定要调用super的方法
     [super layoutSubviews];
 
     // 1.设置按钮的frame
     self.nameView.frame = self.bounds;
 
     // 2.设置数的frame
     CGFloat countY = ;
     CGFloat countH = self.frame.size.height;
     CGFloat countW = ;
     CGFloat countX = self.frame.size.width -  - countW;
     self.countView.frame = CGRectMake(countX, countY, countW, countH);
 }
 
 //设置数据
 - (void)setGroup:(MJFriendGroup *)group
 {
     _group = group;
 
     // 1.设置按钮文字(组名)
     [self.name setTitle:group.name forState:UIControlStateNormal];
 
     // 2.设置数量(总数)
     self.count.text = [NSString stringWithFormat:@"%lu", friends.count];
 }
 
 @end