The problem

单元更新后看来,牢房里的Label人的规模并不等于所代表的价值大小。我将尽力作出更好的解释。

UISlider的最低月度为-100,最高值为100。因此,表态第一次装满,cell.detailText.显示0.0%的巫师是ok,但当我搬动梯子,价值更大时,例如55.5%,标签不能保持这种额外性,显示“55.............>。

This is how I create the cell that holds de UISlider Value create the UISlider in the cellForRowAtIndexPath delegate method

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:ProductCellIdentifier] autorelease];
cell.textLabel.text=@"Performance";
cell.detailTextLabel.text = [NSString stringWithFormat:@"%.1f%%", slider.value];
cell.tag=1002;

This is how I create de UISlider, in the cellForRowAtIndexPath method:

cell = [[[UITableViewCellalloc] initWithFrame:CGRectZero                                                           reuseIdentifier:ProductCellIdentifier] autorelease];

slider = [[UISlideralloc] initWithFrame:CGRectMake(90, 12, 200, 25)];

slider.maximumValue = 100;
slider.minimumValue = -100;
slider.continuous = TRUE;

[slideraddTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged];

[cell.contentView addSubview:slider];
cell.tag=0;
[slider release];

And this is what I do in the sliderChanged method in order to update the cell.

UITableViewCell *celda= (UITableViewCell *)[[self tableView] viewWithTag:1002];
celda.detailTextLabel.text = [NSString stringWithFormat:@"%.1f%%", slider.value];

I suspect that the solution is about the use of the reloadData method of the UITableView but not sure. I have tried inserting a self.tableView.reloadData in the sliderChanged method but I got then the UISlider does not move and finally I got this exception:
Terminating app due to uncaught exception NSRangeException , reason: -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)

Thanks in advance for your help
Javi

Answer 1

the problem is that detailTextLabel width is fixed and computed only when the label is going to be drawn in the cell. so, when you initialize the label with "0.0%" there is room for exactly 4 characters, and you cannot visualize correctly anything with more than that; extra charactes are either trimmed with "..." or the label just doesn t display anything.

i 围绕这一问题开展工作,迫使标签在像此那样的扼杀开始时增加空间:

while ([string length] <= 4)
      string = [NSString stringWithFormat:@" %@",prestring];
cell.detailTextLabel.text = string;

这样,我的梯子能够准确地将数字从0到999;因为你们的特性更简单地调整所期望的长度。

Answer 2

为什么要使用<条码>保险单。当你更新电池的值时? 我认为,如果你先把电梯的价值投入电池,即:

cell.detailTextLabel.text = [NSString stringWithFormat:@"%.1f%%", slider.value];

Answer 3

你们出入牢房的方式可能不会让你看到你所期望的囚室。您最初分配的标签为1002? <代码>celda。然后,仅仅检查,就将电池标签的价值定在不太模糊的地方。

The problem

This is how I create the cell that holds de UISlider Value create the UISlider in the cellForRowAtIndexPath delegate method

This is how I create de UISlider, in the cellForRowAtIndexPath method:

And this is what I do in the sliderChanged method in order to update the cell.

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