Question

附加代码返回错误：

Control may reach end non-void function

代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    if (indexPath.row == 0) {
        FirstCustomCell *fCustomCell = [tableView dequeueReusableCellWithIdentifier:@"firstCustomCell" forIndexPath:indexPath];

        if (fCustomCell == nil) {

            fCustomCell = [[FirstCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"firstCustomCell"];
        }

        return fCustomCell;

    }

    else if (indexPath.row == 1) {
        SecondCustomCell *sCustomCell = [tableView dequeueReusableCellWithIdentifier:@"secondCustomCell" forIndexPath:indexPath];

        if (sCustomCell == nil) {

            sCustomCell = [[SecondCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"SecondCustomCell"];
        }

        return sCustomCell;

    }
} //<-- Control may reach non-void function (I precise that's the end of the cellForRowAtIndexPath method)

我知道这个问题是特别在“返回”但是如何消除错误？

Answer 1

添加return nil;行。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    if (indexPath.row == 0) {
        FirstCustomCell *fCustomCell = [tableView dequeueReusableCellWithIdentifier:@"firstCustomCell" forIndexPath:indexPath];

        if (fCustomCell == nil) {

            fCustomCell = [[FirstCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"firstCustomCell"];
        }

        return fCustomCell;

    }

    else if (indexPath.row == 1) {
        SecondCustomCell *sCustomCell = [tableView dequeueReusableCellWithIdentifier:@"secondCustomCell" forIndexPath:indexPath];

        if (sCustomCell == nil) {

            sCustomCell = [[SecondCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"SecondCustomCell"];
        }

        return sCustomCell;

    }
    return nil;
     }

我可能会补充一点，您需要确保fCustomCell和sCustomCell不是{!=）nil。

if (!fCustomCell) {
    fCustomCell = [UITableViewCell alloc] initWithStyle:/*aStyle*/ reuseIdentifier:/*identifier*/];
}

标识符可以是在方法开头定义的静态NSString，如下所示：static NSString *identifier = @"cell";

查看一些教程。

控制可能达到最终的非空隙功能

1 个答案: