UILabel with viewWithTag - (text not appearing)

问题

have a UITableViewCell, to which I add a label on it with tag 1000.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"];

    UILabel *label = (UILabel *) [cell viewWithTag:1000];

if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

then

 UILabel *labelName = (UILabel *)[cell viewWithTag:1000]
 labelName.text = @"test".

When I run, the cell is empty. Any advice?

回答1:

You should check if [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"] and [cell viewWithTag:5000] are returning something other than nil.

If they are, be sure to do it in this order:

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

    //Try to reuse the cell
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"];

    //If you can't reuse, instantiate the cell 
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"ChecklistItem"];
    }

    //Now that you have your cell, find the label 
    UILabel *labelName = (UILabel *)[cell viewWithTag:5000];

    //Check if the label exists just in case 
    if (labelName) {
        //And set the text
        [labelName setText:@"test"];
    }
}

回答2:

The problem could also be that you aren't using a unique tag number. Meaning that something in your view controller scene could possibly have the same tag number that you have defined on another object.

For example, for me, I had a UITableViewCell which had a tag # of 0 and a UILabel with a tag # of 0 and another UILabel with a tag # of 1. This caused problems and made it to where tag #1 wouldn't display at all. I could see the text when I clicked on the row -- but the data wouldn't show when the row wasn't clicked on.

When I changed the tag numbers of both UILabels, it fixed the issue.

回答3:

The issue already solved, my application was working very fine on iPhone, so I decide to make it universal. I copy all view controller to iPad storyboard. And I start doing some change on iPad storyboard.

Whatever I add/delete on iPad storyboard, didn't make any change as the main interface was iphone and the reason was that I didn't change the main interface for iPad, so while running on iPad, I was using the storyboard of iPhone.

来源：https://stackoverflow.com/questions/25888469/uilabel-with-viewwithtag-text-not-appearing

标签

ios

uitableview

uilabel