我有一个从Github下载的自定义UILabel（称为KILabel）。我得到它的原因是因为我想复制Instagram的活动源（分段控件和带有2组不同信息的UITableViews）。在Instagram的应用程序中，我知道有能力点击每个UITableViewCell中包含的标签内的人们用户名（这是KILabel发挥作用的地方）。 KILabel识别＆＃34; @ usernames＆＃34;，＆＃34; #hashtags＆＃34;和URL，使它们几乎像UIButton一样可以点播。
我之前没有使用KILabel并使用常规的UILabel，它能够在iOS 8和iOS 7中扩展。现在，当我使用KILabel时，它会自动扩展（动态更改其高度以适应文本）仅在iOS 7上， NOT 开始展开。当我滚动我的UITableViewController时，就是标签展开的时候。它从正常高度开始。
截至目前，这就是Custom Cell的样子
#import <UIKit/UIKit.h>
#import "KILabel.h"
@interface NewsCell : UITableViewCell
@property (strong, nonatomic) IBOutlet KILabel *cellLabel;
@property (strong, nonatomic) IBOutlet UIImageView *cellImageView;
@end
我将界面（storyboard）中的标签连接到自定义KILabel类以及ImageView。
接下来，我在UITableViewController中实现了单元格。我用一大段文本测试它，看看单元格和标签是否会扩展到正确的大小
cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier2 forIndexPath:indexPath];
cell.cellImageView.layer.cornerRadius = 6.0f;
cell.cellImageView.clipsToBounds = YES;
cell.cellImageView.layer.borderWidth = 1.0f;
cell.cellImageView.layer.borderColor = [[UIColor blackColor] CGColor];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] init];
longPress.numberOfTapsRequired = 1;
[cell.cellLabel addGestureRecognizer:longPress];
//Create the cell label going into the cell
cell.cellLabel.linkTapHandler = ^(KILinkType linkType, NSString *string, NSRange range) {
NSString *mString = [string stringByReplacingOccurrencesOfString:@"@" withString:@""];
if (linkType == KILinkTypeURL) {
// Open URLs
//[self attemptOpenURL:[NSURL URLWithString:string]];
} else if (linkType == KILinkTypeUserHandle) {
if (longPress.state == UIGestureRecognizerStatePossible) {
[self tapOnUsername:longPress username:mString];
}
} else {
// Put up an alert with a message if it's not an URL
NSString *linkTypeString = @"Username";
if (linkType == KILinkTypeHashtag)
{
linkTypeString = @"Hashtag";
}
NSString *message = [NSString stringWithFormat:@"You tapped %@ which is a %@", string, linkTypeString];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello"
message:message
delegate:nil
cancelButtonTitle:@"Dismiss"
otherButtonTitles:nil];
[alert show];
}
};
PFObject *eachNews = [self.followingNews objectAtIndex:indexPath.row];
PFUser *notifier = [eachNews objectForKey:@"Notifier"];
PFUser *notified = [eachNews objectForKey:@"Notified"];
[notifier fetchIfNeeded];
[notified fetchIfNeeded];
NSString *notifierString = [[NSString alloc] init];
NSString *notifiedString = [[NSString alloc] init];
NSString *grammer = [[NSString alloc] init];
NSDate *timeStamp = eachNews.createdAt;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MMM d, yyyy h:mm a"];
NSString *timeString = [timeStamp formattedAsTimeAgo];
if ([notifier.username isEqualToString:_loggedInUser.username]) {
notifierString = @"You";
grammer = @"are";
} else {
notifierString = [NSString stringWithFormat:@"@%@", notifier.username];
grammer = @"is";
}
if ([notified.username isEqualToString: _loggedInUser.username]) {
notifiedString = @"you";
} else {
notifiedString = [NSString stringWithFormat:@"@%@", notified.username];
}
if (notifier[@"profileImage"] == nil) {
UIImage *hermet = [UIImage imageNamed:@"user"];
[cell.cellImageView setImage:hermet];
} else {
PFFile *imageFile = notifier[@"profileImage"];
[cell.cellImageView setImage:[UIImage imageWithData:[imageFile getData]]];
}
NSMutableString *newsText = [[NSMutableString alloc] init];
if ([eachNews[@"Type"] isEqualToString:@"Follow"]) {
[newsText appendString:[NSString stringWithFormat:@"%@ aaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUVaaaaaaaaaaaaaaasdasafsfsdgsdgsdfgsdfsodjnfsaioefgnarpuoigbweuifbsdpugbdsfiougbsdiugosbdgiusobfasdioFPBSADUBVSIUDVBSAIUDBSDIUVBSDUVIBDSFIUVBSDIUVSBAVIPUBDSIUV%@ %@.\n", notifierString, eachNews[@"Messages"], notifiedString]];
} else if ([eachNews[@"Type"] isEqualToString:@"New Founder"]) {
[newsText appendString:[NSString stringWithFormat:@"%@ %@ %@.\n", notifierString, grammer, eachNews[@"Messages"]]];
} else if ([eachNews[@"Type"] isEqualToString:@"Club Create"]) {
if([notified.username isEqualToString:_loggedInUser.username]) {
notifiedString = @"You";
} else {
notifiedString = notified.username;
}
if (notified[@"profileImage"] == nil) {
UIImage *hermet = [UIImage imageNamed:@"user"];
[cell.cellImageView setImage:hermet];
} else {
PFFile *imageFile = notified[@"profileImage"];
[cell.cellImageView setImage:[UIImage imageWithData:[imageFile getData]]];
}
[newsText appendString:[NSString stringWithFormat:@"%@ %@\n", notifiedString, eachNews[@"Messages"]]];
}
[newsText appendString:timeString];
NSArray *appendedString = [newsText componentsSeparatedByString:@"\n"];
NSRange dateRange = [newsText rangeOfString:appendedString[1]];
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:newsText];
[attrString beginEditing];
[attrString addAttribute: NSForegroundColorAttributeName
value:[UIColor lightGrayColor]
range:dateRange];
[attrString endEditing];
cell.cellLabel.attributedText = attrString;
CGSize sizeForLabel = CGSizeMake(cell.cellLabel.frame.size.width, 0);
CGRect labelRect = CGRectMake(cell.cellLabel.frame.origin.x, cell.cellLabel.frame.origin.y, sizeForLabel.width, CGFLOAT_MAX);
// Use a dummy label and its textRectForBounds method to calculate the height
// of a real label.
KILabel *measureLabel = [[KILabel alloc] initWithFrame:CGRectMake(cell.cellLabel.frame.origin.x, cell.cellLabel.frame.origin.y, labelRect.size.width, 0)];
measureLabel.numberOfLines = 0;
measureLabel.attributedText = attrString;
labelRect = [measureLabel textRectForBounds:labelRect limitedToNumberOfLines:0];
cell.cellLabel.frame = labelRect;
UITableViewCell的高度非常好，可以完美展开。标签是唯一的问题。它在iOS 8上根本没有扩展，只在后扩展 我在iOS 7上的UITableViewController中滚动。
我会标记KILabel，但是我不能，如果有人使用了像KILabel这样的其他UILabel，并且能够让它们自动扩展，请转介给我们。
GitHub上的KILabel：https://github.com/Krelborn/KILabel
另外，我已经尝试过GitHub上发布的创作者Gist，这将让我的单元格完美展开。