IOS 九宫格布局实现方法

//
// ButtonContainerView.h
// chemuchao
//
// Created by 遇见远洋 on 16/3/7.
// Copyright © 2016年 zhaoxiaolu. All rights reserved.
//

#import <UIKit/UIKit.h>
//按钮点击block
typedef void(^spitlotBtnClick)(UIButton * btn);
@interface ButtonContainerView : UIView
@property (nonatomic,copy)spitlotBtnClick spitlotBlock;/**<<#展示对话内容的tableview#>*/

@end

//
// ButtonContainerView.m
// chemuchao
//
// Created by 遇见远洋 on 16/3/7.
// Copyright © 2016年 zhaoxiaolu. All rights reserved.
//

#import "ButtonContainerView.h"
#import "UIView+Extension.h"
//状态栏高度
#define kStateHeight 20

//总行数
#define kRows 2

//总列数
#define kCols 4

//九宫格个数
#define kCount 8

//九宫格之间的间隙
#define kMargin 5

//字体大小
#define kFont15 [UIFont systemFontOfSize:15]

@interface ButtonContainerView ()
@property (nonatomic,strong)NSMutableArray * btns;
@property (nonatomic,strong)NSArray * btnTitles;

@end
@implementation ButtonContainerView

- (NSMutableArray *)btns
{
  if (!_btns) {
    _btns = [NSMutableArray array];
  }
  return _btns;
}

-(NSArray *)btnTitles {
  if (!_btnTitles) {
    _btnTitles = @[@"堵成狗",@"堵成翔",@"路太窄",@"没灯",@"路不平",@"积水多",@"颠簸",@"路太脏"];
  }
  return _btnTitles;
}
- (instancetype)initWithFrame:(CGRect)frame{
  if (self = [super initWithFrame:frame]) {
    [self setupUI];
  }
  return self;
}

- (void)setupUI {
  for (int i = 0; i < kCount; i++) {
    UIButton * btn = [[UIButton alloc]init];
    [btn setTitle:self.btnTitles[i] forState:UIControlStateNormal];
    [self addSubview:btn];
    btn.layer.borderWidth = 1;
    btn.layer.borderColor = [UIColor redColor].CGColor;


      btn.titleLabel.font = [UIFont systemFontOfSize:13];
    [btn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(spitlotBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.btns addObject:btn];
  }
}

-(void)layoutSubviews {
  [super layoutSubviews];
  [self.btns enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    UIButton * btn = obj;
    btn.tag = idx;
    //行号
    NSUInteger row = idx/kCols;

    //列号
    NSUInteger col = idx%kCols;

    CGFloat btnW = (self.width - kMargin*(kCols + 1))/kCols;

    CGFloat btnH = (self.height - kMargin*(kRows + 1))/kRows -10;

    CGFloat btnX = kMargin + col*(kMargin + btnW);

     CGFloat btnY = kMargin + row*(kMargin + btnH) + kStateHeight;

    btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
  }];
}

#pragma mark 按钮点击事件
- (void)spitlotBtnClick:(UIButton *)sender {
  NSAssert(self.spitlotBlock != nil, @"传入的block不能为空");
  //执行block
  self.spitlotBlock(sender);
}
@end