九宫格的计算

Snip20160527_1.png

九宫格的计算就是要知道行数和列数

 // 数据
    NSArray *images = @[@"publish-video",  @"publish-picture", @"publish-text", @"publish-audio", @"publish-review", @"publish-offline"];
    NSArray *titles = @[@"发视频", @"发图片", @"发段子", @"发声音", @"审帖", @"离线下载"];
    
    // 添加6个按钮
    int maxCols = 3;
    CGFloat buttonW = 72;
    CGFloat buttonH = buttonW + 30;
    CGFloat buttonStarY = (BSScreenH - 2 * buttonH) * 0.5;
    CGFloat buttonStarX = 20;
    CGFloat xMargin = (BSScreenW - 2 * buttonStarX - maxCols * buttonW) / (maxCols - 1);
    
    for (int i = 0; i < images.count; i++) {
        BSVerticalButton *button = [[BSVerticalButton alloc] init];
        // 设置内容
        button.titleLabel.font = [UIFont systemFontOfSize:14];
        [button setTitle:titles[i] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button setImage:[UIImage imageNamed:images[i]] forState:UIControlStateNormal];
        
        // 设置frame
        button.width = buttonW;
        button.height = buttonH;
        // 九宫格计算
        /*
         0  1  2
         3  4  5
         6  7  8
         */
        int row = i / maxCols; // 行
        int col = i % maxCols; // 列
        
        button.x = buttonStarX + col * (xMargin + buttonW);
        button.y = buttonStarY + row * buttonH;
        
        
        [self.view addSubview:button];