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我在通常的“添加自己的标签/图像到cell.contentview”从控制器的cellForRowAtIndexPath内。我试图让其中一个标签具有动画滚动文本：也就是说，如果标签中的文本溢出了viewCell宽度，则单元格中的标签应滚动文本（动画 - 不是手动）。此外，这整个tableview +滚动文本应适用于iPhone和iPad（所以一切都需要相应地自动调整大小）。UIView帧不能更新大小在UILabel中创建滚动文本动画
切正题，问题是：
如何获得cell.contentView的一个子视图来更新它的框架尺寸上的时间进行测试，如果该子视图溢出中的文本或没有。
或者，这是甚至正确的方式去呢？
这里的（等说明如下secondLabel）我的意思的图像：
现在，您可以继续阅读细节：
我试着去了解事情是这样的通过cellForRowAtIndexPath将自定义的UISCrollLabelView实例添加到单元格的contentView中。这个自定义类实际上是一个UIView，它在内部管理一个UILabel。
UISCrollLabelView应自动调整大小不会溢出表格单元格（应该适用于iPhone和iPad）。然后，根据cellForRowAtIndexPath传递给它的文本的长度，它应该自动调整内部标签的大小以适应所有文本，并且如果标签结束溢出视图（self），则为UILabel的滚动设置动画。
我对此有几个问题，但主要是：UIScrollableView基于比较其内部标签的frame.size.width与self.frame.size.width来触发（或不）动画。但显然，自身的帧宽需要一些时间才能从0更新到它在插入cell.contenView之后最终调整大小的大小。这意味着，当我的自定义UIScrollLabelView测试(label.frame.size.width > self.frame.size.width)这总是如此，并且不溢出的文本仍然滚动。第二秒左右，self.frame会更新为正确的大小。
这里的cellForRowAtIndexPath（secondLabel是这里的滚动视图）：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UIImageSmartView *cachedImage;
UILabel *mainLabel;
UIScrollLabelView *secondLabel;
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.selectionStyle = UITableViewCellSelectionStyleGray;
mainLabel = [[[UILabel alloc] initWithFrame:CGRectMake(70, 0, 0, 20)] autorelease];
mainLabel.font = [UIFont boldSystemFontOfSize:18];
mainLabel.textAlignment = UITextAlignmentLeft;
mainLabel.textColor = [UIColor blackColor];
mainLabel.backgroundColor = [UIColor clearColor];
mainLabel.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin);
mainLabel.tag = MAINLABEL_TAG;
secondLabel = [[[UIScrollLabelView alloc] initWithFrame:CGRectMake(70, 40, 0, 20)] autorelease];
secondLabel.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin);
//secondLabel.backgroundColor = [UIColor clearColor];
secondLabel.tag = SECONDLABEL_TAG;
cachedImage = [[UIImageSmartView alloc] initWithFrame:CGRectMake(5, 5, 57, 80)];
cachedImage.tag = PHOTO_TAG;
[cell.contentView addSubview:cachedImage];
[cell.contentView addSubview:mainLabel];
[cell.contentView addSubview:secondLabel];
}
else
{
cachedImage = (UIImageSmartView*)[cell.contentView viewWithTag:PHOTO_TAG];
mainLabel = (UILabel*)[cell.contentView viewWithTag:MAINLABEL_TAG];
secondLabel = (UIScrollLabelView*)[cell.contentView viewWithTag:SECONDLABEL_TAG];
}
// Configure the cell...
NSString *ImageName = [[dbData objectAtIndex:indexPath.row] objectAtIndex:2];
NSString *imageURL = [NSString stringWithFormat:@"http://someserver", referencingTable];
[cachedImage loadAndCacheImageFromFile:ImageName fromURL:imageURL inSize:CGSizeMake(57, 80) withBorderWidth:4];
mainLabel.text = [[dbData objectAtIndex:indexPath.row] objectAtIndex:0];
// -> At this point I load the text into the "scrolling label"
// (actually a UIView with a label)
[secondLabel setScrollingText:[[dbData objectAtIndex:indexPath.row] objectAtIndex:1]];
return cell;
}
而且我UIScrollLabelView实现看起来像这样至今：
@implementation UIScrollLabelView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
// Initialization code
isScrolling = NO;
self.clipsToBounds = YES;
UILabel *label = [[[UILabel alloc] init] autorelease];
label.font = [UIFont systemFontOfSize:14.0];
label.textAlignment = UITextAlignmentLeft;
label.textColor = [UIColor darkGrayColor];
label.backgroundColor = [UIColor greenColor];
self.backgroundColor = [UIColor redColor];
//label.backgroundColor = [UIColor clearColor];
[self addSubview: label];
}
return self;
}
- (void)setScrollingText:(NSString*)text
{
[self setNeedsLayout];
UILabel *label = [[self subviews ] objectAtIndex:0];
label.text = text;
[label sizeToFit];
if(label.frame.size.width > self.frame.size.width)
[self scrollText];
}
- (void)scrollText
{
if(isScrolling)
return;
isScrolling = YES;
UILabel *label = [[self subviews ] objectAtIndex:0];
[UIView beginAnimations:@"scroll" context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDidStopSelector:@selector(scrollDidComplete)];
[UIView setAnimationDuration: label.frame.size.width/(float)100];
CGRect frame = label.frame;
if(frame.origin.x == 0)
frame.origin.x = frame.origin.x - (frame.size.width - self.frame.size.width);
else
frame.origin.x = 0;
label.frame = frame;
[UIView commitAnimations];
}
- (void)scrollDidComplete
{
isScrolling = NO;
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(scrollText) userInfo:nil repeats:NO];
}
@end