項(xiàng)目中有卡片效果顯示的樣式，即一個(gè)表格呈卡片狀，有陰影及邊框。

• 思路：將 UITableView 的每個(gè) section 統(tǒng)一設(shè)置成卡片效果，即同時(shí)給 UITableView 的 header，footer, cell 添加陰影及邊框。進(jìn)一步說(shuō)，就是給 tableViewHeader 的左上右部分添加 view，給 tableViewFooter 的左下右部分添加 view，給 cell 的左右部分添加 view，最后給這些 view 全部添加漸變色。

• 效果圖

卡片效果圖

• 核心代碼：

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, headerViewHeight)];
    view.backgroundColor = [UIColor whiteColor];
    UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(2, 4, 6, headerViewHeight-4)];
    [view addSubview:leftView];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, headerViewHeight)];
    label.text = [NSString stringWithFormat:@"       組頭%ld", section+1];
    [view addSubview:label];
    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = leftView.bounds;
    gradient.colors = [NSArray arrayWithObjects:
                       (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor,
                       (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor, nil];
    gradient.startPoint = CGPointMake(0, 0);
    gradient.endPoint = CGPointMake(1, 0);
    [leftView.layer addSublayer:gradient];
    
    UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(kScreenWidth - 8, 4, 6, headerViewHeight-4)];
    [view addSubview:rightView];
    CAGradientLayer *gradientR = [CAGradientLayer layer];
    gradientR.frame = rightView.bounds;
    gradientR.colors = [NSArray arrayWithObjects:
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor,
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
    gradientR.startPoint = CGPointMake(0, 0);
    gradientR.endPoint = CGPointMake(1, 0);
    [rightView.layer addSublayer:gradientR];
    
    UIView *topV = [[UIView alloc] initWithFrame:CGRectMake(6, 2, kScreenWidth - 12, 2)];
    [view addSubview:topV];
    CAGradientLayer *gradientT = [CAGradientLayer layer];
    gradientT.frame = topV.bounds;
    gradientT.colors = [NSArray arrayWithObjects:
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor,
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
    gradientT.startPoint = CGPointMake(0, 1);
    gradientT.endPoint = CGPointMake(0, 0);
    [topV.layer addSublayer:gradientT];
    return view;
}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, footerViewHeight)];
    view.backgroundColor = [UIColor whiteColor];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, footerViewHeight)];
    label.text = [NSString stringWithFormat:@"       組尾%ld", section+1];
    [view addSubview:label];
    UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(2, 0, 6, footerViewHeight-4)];
    [view addSubview:leftView];
    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = leftView.bounds;
    gradient.colors = [NSArray arrayWithObjects:
                       (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor,
                       (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
    gradient.startPoint = CGPointMake(1, 0);
    gradient.endPoint = CGPointMake(0, 0);
    [leftView.layer addSublayer:gradient];
    
    UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(kScreenWidth - 8, 0, 6, footerViewHeight-4)];
    [view addSubview:rightView];
    CAGradientLayer *gradientR = [CAGradientLayer layer];
    gradientR.frame = rightView.bounds;
    gradientR.colors = [NSArray arrayWithObjects:
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0) blue:(0/255.0)  alpha:0.12].CGColor,
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
    gradientR.startPoint = CGPointMake(0, 0);
    gradientR.endPoint = CGPointMake(1, 0);
    [rightView.layer addSublayer:gradientR];
    
    UIView *bottomV = [[UIView alloc] initWithFrame:CGRectMake(6, footerViewHeight-4, kScreenWidth - 12, 2)];
    [view addSubview:bottomV];
    CAGradientLayer *gradientB = [CAGradientLayer layer];
    gradientB.frame = bottomV.bounds;
    gradientB.colors = [NSArray arrayWithObjects:
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0) blue:(0/255.0)  alpha:0.12].CGColor,
                        (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0) blue:(0/255.0)  alpha:0.0].CGColor, nil];
    gradientB.startPoint = CGPointMake(0, 0);
    gradientB.endPoint = CGPointMake(0, 1.0);
    [bottomV.layer addSublayer:gradientB];
    return view;
}

• 自定義的cell中的demo：

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(2, 0, 6, cellHeight)];
        [self addSubview:leftView];
        CAGradientLayer *gradient = [CAGradientLayer layer];
        gradient.frame = leftView.bounds;
        // 漸變色數(shù)組
        gradient.colors = [NSArray arrayWithObjects:
                           (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor,
                           (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
        gradient.startPoint = CGPointMake(1, 0);
        gradient.endPoint = CGPointMake(0, 0);
        [leftView.layer addSublayer:gradient];
        
        UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(kScreenWidth - 8, 0, 6, cellHeight)];
        [self addSubview:rightView];
        
        CAGradientLayer *gradientR = [CAGradientLayer layer];
        gradientR.frame = rightView.bounds;
        // 漸變色數(shù)組
        gradientR.colors = [NSArray arrayWithObjects:
                            (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.12].CGColor,
                            (id)[UIColor colorWithRed:(0/255.0)  green:(0/255.0)  blue:(0/255.0)  alpha:0.0].CGColor, nil];
        gradientR.startPoint = CGPointMake(0, 0);
        gradientR.endPoint = CGPointMake(1, 0);
        [rightView.layer addSublayer:gradientR];
        
        self.testLabel = [UILabel new];
        [self addSubview:self.testLabel];
        self.testLabel.frame = self.frame;
    }
    return self;
}

• demo地址，歡迎各位同行一起交流學(xué)習(xí)。