如何在UITableView下添加活动指示器？

Question

在我的应用程序中,我想在UItableview下添加活动指示器,其中tableview将滚动但我不知道如何在那里添加活动指示器.

详细说明,当我将完成tableview的滚动时,为了获得更多数据,我必须通过活动指示器设置刷新选项.

我已经在tableview的顶部尝试了它并且它工作但我不知道如何将它添加到tableview下面.这是一些示例代码..

      - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
if (isLoading) return;
isDragging = YES;


refreshHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT, 320, REFRESH_HEADER_HEIGHT)];
refreshHeaderView.backgroundColor = [UIColor clearColor];

refreshLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT, 320, REFRESH_HEADER_HEIGHT)];
refreshLabel.backgroundColor = [UIColor clearColor];
refreshLabel.font = [UIFont boldSystemFontOfSize:12.0];
refreshLabel.textAlignment = UITextAlignmentCenter;

refreshArrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"refresharrow.png"]];
refreshArrow.frame = CGRectMake((scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT - 27) / 2,
                                (scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT - 44) / 2,
                                27, 44);

refreshSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
refreshSpinner.frame = CGRectMake((scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT - 20) / 2, (scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT - 20) / 2, 20, 20);
refreshSpinner.hidesWhenStopped = YES;

[refreshHeaderView addSubview:refreshLabel];
[refreshHeaderView addSubview:refreshArrow];
[refreshHeaderView addSubview:refreshSpinner];
[tableview addSubview:refreshHeaderView];


}

 - (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (isLoading) {
    // Update the content inset, good for section headers
    if (scrollView.contentOffset.y > 0){
        NSLog(@"scrollView.contentOffset.y 1= %d",scrollView.contentOffset.y );
        tableview.contentInset = UIEdgeInsetsZero;
    }
    else if (scrollView.contentOffset.y >= -REFRESH_HEADER_HEIGHT){
        NSLog(@"scrollView.contentOffset.y 2= %d",scrollView.contentOffset.y );
        tableview.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
    }
} else if (isDragging && scrollView.contentOffset.y > scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT) {
    // Update the arrow direction and label
    [UIView beginAnimations:nil context:NULL];
    if (scrollView.contentOffset.y > scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT) {
        // User is scrolling above the header
        NSLog(@"scrollView.contentOffset.y 3= %d",scrollView.contentOffset.y );
        refreshLabel.text = self.textRelease;
        [refreshArrow layer].transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
    } else { // User is scrolling somewhere within the header
        refreshLabel.text = self.textPull;
        [refreshArrow layer].transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
    }
    [UIView commitAnimations];
}
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
if (isLoading) return;
isDragging = NO;
if (scrollView.contentOffset.y >= scrollView.contentOffset.y + REFRESH_HEADER_HEIGHT) {
    // Released above the header
    [self startLoading];
}
}

所以请有人给我一些关于我该怎么做的示例代码.

实际上我是iphone应用程序开发的新手.所以请帮助我.

提前致谢.

Answer 1

这就是我做到的方式:

UIActivityIndicatorView *spinner = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray] autorelease];
[spinner startAnimating];
spinner.frame = CGRectMake(0, 0, 320, 44);
self.tableView.tableFooterView = spinner;

然后你只需设置tableFooterView以nil将其删除.

注:44,顺便说一句,是一个默认的高度UITableViewCell使用时UITableViewStylePlain.这是45 UITableViewStyleGrouped.

Answer 2

Swift更新: -

let pagingSpinner = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
pagingSpinner.startAnimating()
pagingSpinner.color = UIColor(red: 22.0/255.0, green: 106.0/255.0, blue: 176.0/255.0, alpha: 1.0)
pagingSpinner.hidesWhenStopped = true
tableView.tableFooterView = pagingSpinner

Answer 3

添加活动指标的最佳方式是在tableview的页脚.

    - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section { 
UIView *headerView = [[[UIView alloc] init]autorelease];

    [headerView setBackgroundColor:[UIColor clearColor]];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Load More" forState:UIControlStateNormal];
button.frame = CGRectMake(10.0, 210.0, 160.0, 40.0);


    [headerView addSubview:button];

    [headerLabel release];

    return headerView;

}  

在footerView中添加一个按钮,并将操作设置为按钮(根据需要).这个app store tableview如何工作.在单击按钮获取更多数据添加到表数组滚动表没有动画.