問題描述

在我的應用程序中，我想在 UItableview 下添加活動指示器，其中 tableview 將滾動，但我不知道如何在此處添加活動指示器.

In my application i want to add activity indicator under UItableview where tableview will scroll but i do not know how can i add activity indicator over there.

詳細說明，當我完成 tableview 的滾動時，對于更多數據，我必須通過活動指示器設置刷新選項.

To elaborate,when i will finish the scrolling of tableview then for more data i have to set a refresh option by an activity indicator.

我已經在 tableview 的頂部嘗試過它并且它有效，但我不知道如何將它添加到 tableview 下方.這是一些示例代碼..

i have tried it at the top of the tableview and it worked but i dont know how can i add it below the tableview. here is some sample code..

      - (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];
}
}

所以請有人給我一些示例代碼，說明我該怎么做.

so please someone give me some example code about how can i do that.

實際上我是 iphone 應用程序開發的新手.所以請幫助我.

actually i am new in iphone application development.So please help me.

提前致謝.

推薦答案

添加活動指示器的最佳方式是在tableview的頁腳.

The best way to add activity indicator is at footer of tableview.

    - (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;

}  

向footerView 添加一個按鈕并將操作設置為按鈕(根據需要).這就是應用商店表格視圖的工作方式.點擊按鈕獲取更多數據添加到表格數組中滾動表格而不動畫.

Add a button to the footerView and set action to button (as you needed). This how app store tableview works. On clicking button fetch some more data add to table array scroll the table without animation.

這篇關于如何在 UITableView 下方添加活動指示器?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！