1.ios 设置 UITableViewCell 组和组之间距离
 UiTableView设置组和组之间的间距： 
  苹果没有提供api 设置组和组之间的间距，
  可以设置组 heightForHeaderInSection
  heightForFooterInSection
  来设置 组头部、底部高度
  来设置 组合组之间的间距

 2. UiTableView Footer 设置
// 1. 获取底部控件最大高度
    self.xmg_height= self.subviews.lastObject.xmg_bottom;
// 2. 还可以用  self.xmg_height= rowCount *  buttonH

高度不起作用：  
 tableView.contentSize = CGSizeMake(0, self.xmg_bottom);

2.  设置图片在上、文字在下
自定义 UIButton

3. 设置间隔  宽、高-1, 把背景显示出来

4. 自定义 CustomCellTableViewCell 重写摆放 ImageView，textLable位置

5. 网页进度条问题： 
  苹果没有提供加载网页进度代理回调， 那么可以在在uiWebView上面做一个View， 
  在网页开始加载的时候启动一个定时器，不断设置UIView的宽度，加载一丢丢，
  当webViewDidFinished的时候，直接设置 100%

 IOS9以后苹果提供了： 
   SFSafariUIViewController
   有进度值

CustomCellTableViewCell.m（自定义 CustomCellTableViewCell 重写摆放 ImageView，textLable位置）

#import "CustomCellTableViewCell.h"
#import "UIView+XMGExtension.h"


@implementation CustomCellTableViewCell

-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    
   

    
    if(self  = [super initWithStyle:style reuseIdentifier:reuseIdentifier]){
        
            self.textLabel.textColor=[UIColor darkGrayColor];
            self.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        
   //      self.accessoryType= [UIImageView alloc] initWithCoder:[UIImage imageNamed:@""];
    }
    
    return  self;
     
}

- (void)awakeFromNib {
    [super awakeFromNib];
    // Initialization code
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}


-(void)layoutSubviews{
    [super layoutSubviews];
    
    if(self.imageView.image==nil) return;
    
    self.imageView.xmg_y = 10;
    self.imageView.xmg_height = self.contentView.xmg_height- 2*10;
    self.imageView.xmg_width= self.imageView.xmg_height;
    
    self.textLabel.xmg_x=  self.imageView.xmg_right+ 10; 
    
  
}

@end

XMGMeFooterView.m

#import "XMGMeFooterView.h"
#import "XMGMeSquare.h"
#import "UIView+XMGExtension.h"
#import "XMGMeSquareButton.h"
//#import <AFNetworking.h>
//#import <MJExtension.h>
//#import <UIButton+WebCache.h>
#import <SafariServices/SafariServices.h>

#define XMGColorA(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:(a)/255.0]
#define XMGColor(r, g, b) XMGColorA((r), (g), (b), 255)
#define XMGRandomColor XMGColor(arc4random_uniform(255), arc4random_uniform(255), arc4random_uniform(255))

#define XMGrayColor(v) XMGColor((v), (v), (v))
#define XMGCommonBgColor XMGrayColor(206)

@implementation XMGMeFooterView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {

        
        // 参数
//        NSMutableDictionary *params = [NSMutableDictionary dictionary];
//        params[@"a"] = @"square";
//        params[@"c"] = @"topic";
//
//        // 请求
//        [[AFHTTPSessionManager manager] GET:@"http://api.budejie.com/api/api_open.php" parameters:params success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary * _Nonnull responseObject) {
//            // 字典数组 -> 模型数组
//            NSArray *squares = [XMGMeSquare mj_objectArrayWithKeyValuesArray:responseObject[@"square_list"]];
//            // 根据模型数据创建对应的控件
//            [self createSquares:squares];
//        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//            XMGLog(@"请求失败 - %@", error);
//        }];
        
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            NSArray *squares= @[@155,@100,@30,@155,@100,@30,@155,@100,@30,@155,@100,@30,@155,@100,@30];
                 
            [self createSquares:squares];
        });
    }
    return self;
}


- (void)createSquares:(NSArray *)squares
{
    // 方块个数
    NSUInteger count = squares.count;
    
    // 方块的尺寸
    int maxColsCount = 4; // 一行的最大列数
    CGFloat buttonW = self.xmg_width / maxColsCount;
    CGFloat buttonH = buttonW;
    
    // 创建所有的方块
    for (NSUInteger i = 0; i < count; i++) {
        // i位置对应的模型数据
     //   XMGMeSquare *square = squares[i];
        
        // 创建按钮
        XMGMeSquareButton *button = [XMGMeSquareButton buttonWithType:UIButtonTypeCustom];
        
        [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button];
        
        // 设置frame
        button.xmg_x = (i % maxColsCount) * buttonW;
        button.xmg_y = (i / maxColsCount) * buttonH;
        button.xmg_width = buttonW -1;
        button.xmg_height = buttonH - 1 ;
        button.tag= i;
        
        // 设置数据
        button.backgroundColor = XMGRandomColor;
        [button setImage:[UIImage imageNamed:@"add_icon_group_create"] forState:UIControlStateNormal];
   //     [button.imageView setImage:[UIImage imageNamed:@"add_icon_group_create"]];
       
        [button setTitle: [NSString stringWithFormat:@"微博%ld",i] forState:UIControlStateNormal];
//        [button setBackgroundImage:[UIImage imageNamed:@"add_icon_group_create"] forState:UIControlStateNormal];
       
    }
    
// 1. 获取底部控件最大高度
    self.xmg_height= self.subviews.lastObject.xmg_bottom;
// 2. 还可以用  self.xmg_height= rowCount *  buttonH
    
     UITableView* tableView= (UITableView*)self.superview;
//    tableView.tableFooterView= self;
    
     tableView.contentSize = CGSizeMake(0, self.xmg_bottom);
}

- (void)buttonClick:(UIButton *)button
{
    NSLog(@"%@",button.titleLabel.text);
    NSLog(@"%ld",button.tag);
    SFSafariViewController* safari= [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:@"https://www.baidu.com"]];
    
    UITableViewController* tab= (UITableViewController*) self.window.rootViewController;
    
    [tab presentViewController:safari animated:YES completion:^{ }];
    
    
    // 如果是tabbar
//    UINavigationController* nav=  tabbar.selecedViewController;
//    [nav pushViewController:safari animated:YES];
}

@end

XMGMeSquareButton 自定义Button 图片在上，文字在下

XMGMeSquareButton.h

#import <UIKit/UIKit.h>
@class XMGMeSquare;

@interface XMGMeSquareButton : UIButton

@property (nonatomic, strong) XMGMeSquare *square;
@end

XMGMeSquareButton.m

#import "XMGMeSquareButton.h"
#import "XMGMeSquare.h"
#import "UIView+XMGExtension.h"


@implementation XMGMeSquareButton

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.titleLabel.textAlignment = NSTextAlignmentCenter;
        self.titleLabel.font = [UIFont systemFontOfSize:15];
//        [self setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
//        [self setBackgroundImage:[UIImage imageNamed:@"mainCellBackground"] forState:UIControlStateNormal];
    }
    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    self.imageView.xmg_y = self.xmg_height * 0.15;
    self.imageView.xmg_height = self.xmg_height * 0.5;
    self.imageView.xmg_width = self.imageView.xmg_height;
    self.imageView.xmg_centerX = self.xmg_width * 0.5;
    
    self.titleLabel.xmg_x = 0;
    self.titleLabel.xmg_y = self.imageView.xmg_bottom-10;
    self.titleLabel.xmg_width = self.xmg_width;
    self.titleLabel.xmg_height = self.xmg_height - self.titleLabel.xmg_y;
}


@end

MyTableViewC.m

#import "MyTableViewC.h"
#import "CustomCellTableViewCell.h"
#import "CustomCell1.h"
#import "XMGMeFooterView.h"
#import "BViewController.h"
#import "XMGClearCacheCell.h"


@interface MyTableViewC ()

@end

@implementation MyTableViewC

- (instancetype)init
{
   return [self initWithStyle:UITableViewStyleGrouped];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [self.view setBackgroundColor:[UIColor grayColor]];
    // frame = (0 35; 414 44); text = 'hello'; 默认cell 从35 开始布局
    // 设置内边距  -25,往上移动 25，那么就是10
    // 从边距开始渲染
 //   self.tableView.contentInset=UIEdgeInsetsMake(-25, 0, 0, 0);
  //  self.tableView.sectionHeaderHeight=10;
    
   
   // init 没有设置 frame,没有 高度
    self.tableView.tableFooterView=[[XMGMeFooterView alloc] init];
    
}
@end

效果图： 

源码地址： https://download.csdn.net/download/dreams_deng/12614145