在UITableViewCell中更改UILabel的背景颜色

A UITableViewCell comes "pre-built" with a UILabel as its one and only subview after you've init'ed it. I'd really like to change the background color of said label, but no matter what I do the color does not change. The code in question:

UITableViewCell是“预先构建的”，UILabel是您初始化后的唯一子视图。我真的想改变所说标签的背景颜色，但无论我做什么，颜色都不会改变。有问题的代码：

UILabel* label = (UILabel*)[cell.contentView.subviews objectAtIndex:0];
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor darkGrayColor];
label.opaque = YES;

4 个解决方案

#1

Your code snippet works fine for me, but it must be done after the cell has been added to the table and shown, I believe. If called from the initWithFrame:reuseIdentifier:, you'll get an exception, as the UILabel subview has not yet been created.

你的代码片段对我来说很好，但是必须在将单元格添加到表格并显示之后完成，我相信。如果从initWithFrame：reuseIdentifier：调用，则会产生异常，因为尚未创建UILabel子视图。

Probably the best solution is to add your own UILabel, configured to your standards, rather than relying on this (very rickety) path to the built-in one.

可能最好的解决方案是添加您自己的UILabel，根据您的标准配置，而不是依赖于内置的（非常摇摇晃晃的）路径。

#2

This doesn't work because the UITableViewCell sets its label backgroundColors in the layoutSubviews method.

这不起作用，因为UITableViewCell在layoutSubviews方法中设置其标签backgroundColors。

If you want to change the color of the built-in textLabel or detailTextLabel, subclass the UITableViewCell and override layoutSubviews. Call the super implementation, THEN change the backgroundColor property to what you want.

如果要更改内置textLabel或detailTextLabel的颜色，请为UITableViewCell创建子类并覆盖layoutSubviews。调用超级实现，然后将backgroundColor属性更改为您想要的。

- (void) layoutSubviews
{   
     [super layoutSubviews];

     self.textLabel.backgroundColor = [UIColor redColor];
}

#3

Add your own label to the contentView when you are allocating the cell, rather than relying on the extraction of the built in one. Then you can control all values:

在分配单元格时，将自己的标签添加到contentView，而不是依赖于内置单元格的提取。然后你可以控制所有值：

UILabel* label = [[[UILabel alloc] init] autorelease];
label.textColor = [UIColor whiteColor];
label.backgroundColor = [UIColor darkGrayColor];
label.opaque = YES;
[cell.contentView addSubview:label];

#4

for (UIView *views in views.subviews)
{
    UILabel* temp = (UILabel*)[views.subviews objectAtIndex:0];
    temp.textColor = [UIColor whiteColor];        
    temp.shadowColor = [UIColor blackColor];
    temp.shadowOffset = CGSizeMake(0.0f, -1.0f);
}

#1