根据个数创建按钮图标（上图下字）

/**
 * 创建方块view.m
 */
- (void)createSquares:(NSArray *)sqaures
{
    // 一行最多4列
    int maxCols = 4;
    
    // 宽度和高度
    CGFloat buttonW = DQScreenW / maxCols;
    CGFloat buttonH = buttonW;
    
    for (int i = 0; i<sqaures.count; i++) {
        // 创建按钮
        DQSqaureButton *button = [DQSqaureButton buttonWithType:UIButtonTypeCustom];
        // 监听点击
        [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        // 传递模型
        button.square = sqaures[i];
        [self addSubview:button];
        
        // 计算frame
        int col = i % maxCols;
        int row = i / maxCols;

        button.x = col * buttonW;
        button.y = row * buttonH;
        button.width = buttonW;
        button.height = buttonH;
        
        //计算高度方式一(每创建一个就计算一次高度)
        //self.height = CGRectGetMaxY(button.frame);
    }
    
//计算总行数方式一  start
    // 8个方块, 每行显示4个, 计算行数 8/4 == 2 2
    // 9个方块, 每行显示4个, 计算行数 9/4 == 2 3
    // 7个方块, 每行显示4个, 计算行数 7/4 == 1 2
    
    // 总行数 能整除就取结果，不能整除就取结果+1
//    NSUInteger rows = sqaures.count / maxCols;
//    if (sqaures.count % maxCols) { // 不能整除, + 1
//        rows++;
//    }
    
//计算总行数方式一  end
    
    
//计算总行数方式二
    // 总页数 == (总个数 + 每页的最大数 - 1) / 每页最大数
    NSUInteger rows = (sqaures.count + maxCols - 1) / maxCols;
    
    // 计算footer的高度方式二
    self.height = rows * buttonH;
    
    // 重绘
    [self setNeedsDisplay];
}

//自定义的DQSqaureButton
- (void)setup
{
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    [self setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    self.titleLabel.font = [UIFont systemFontOfSize:15];
    [self setBackgroundImage:[UIImage imageNamed:@"mainCellBackground"] forState:UIControlStateNormal];
}

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setup];
    }
    return self;
}

- (void)awakeFromNib
{
    [self setup];
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    // 调整图片
    self.imageView.y = self.height * 0.15;
    self.imageView.width = self.width * 0.5;
    self.imageView.height = self.imageView.width;
    self.imageView.centerX = self.width * 0.5;
    
    // 调整文字
    self.titleLabel.x = 0;
    self.titleLabel.y = CGRectGetMaxY(self.imageView.frame);
    self.titleLabel.width = self.width;
    self.titleLabel.height = self.height - self.titleLabel.y;
}

- (void)setSquare:(DQSquare *)square
{
    _square = square;
    
    [self setTitle:square.name forState:UIControlStateNormal];
    // 利用SDWebImage给按钮设置image
    [self sd_setImageWithURL:[NSURL URLWithString:square.icon] forState:UIControlStateNormal];
}