Determine The Maximum Number of Characters a UIlabel Can Take

determine the maximum number of characters a UILabel can take

Well, what I did here works though there may be another, more efficient (yet less straight-forward) way.

What I did was just calculate the size of the rect needed for the text, see if it fits in the label's frame, and if not, chop off a character and try again.

@interface LTViewController ()

@property (nonatomic, weak) IBOutlet UILabel *label1;
@property (nonatomic, weak) IBOutlet UILabel *label2;

@end

@implementation LTViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    UILabel *label1 = self.label1;
    UILabel *label2 = self.label2;

    UIFont *font = label1.font;
    NSString *text = @"This is some text that will go into labels 1 and 2.";

    CGRect label1Frame = label1.frame;

    NSUInteger numberOfCharsInLabel1 = NSNotFound;

    for (int i = [text length]; i >= 0; i--) {
        NSString *substring = [text substringToIndex:i];
        NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:substring
                                                                             attributes:@{ NSFontAttributeName : font }];
        CGSize size = CGSizeMake(label1Frame.size.width, CGFLOAT_MAX);
        CGRect textFrame = [attributedText boundingRectWithSize:size
                                                        options:NSStringDrawingUsesLineFragmentOrigin
                                                        context:nil];

        if (CGRectGetHeight(textFrame) <= CGRectGetHeight(label1Frame)) {
            numberOfCharsInLabel1 = i;
            break;
        }
    }

    if (numberOfCharsInLabel1 == NSNotFound) {
        // TODO: Handle this case.
    }

    label1.text = [text substringToIndex:numberOfCharsInLabel1];
    label2.text = [text substringWithRange:NSMakeRange(numberOfCharsInLabel1, [text length] - numberOfCharsInLabel1)];
}

@end

This yields:

It's up to you to handle the error conditions. For example, the rest doesn't completely fit into label2 and it's probably going to chop in the middle of a word more often then not.

How do you limit UILabel characters in swift?

If you want to limit the UILabel to just 10 characters then
you just have to assign it with a text with length of 10.
You can use NSString and NSRange to extract the text you need.

let str = "This is a Very Long Label"
let nsString = str as NSString
if nsString.length >= 10
{
  label.text = nsString.substringWithRange(NSRange(location: 0, length: nsString.length > 10 ? 10 : nsString.length))
}

How to limit UILabel to 25 characters and show dots if exceeds using auto layout

You can do something like,

  if (lbl.text?.characters.count)! >= 25 {

        let index = lbl.text?.index((lbl.text?.startIndex)!, offsetBy: 25)
        lbl.text = lbl.text?.substring(to: index!)
        lbl.text = lbl.text?.appending("...")
    }

    //lbl.adjustsFontSizeToFitWidth = true
    //lbl.lineBreakMode = .byTruncatingTail

And your constraints should be like : Top,leading,fixed height!

How To Count how many characters can come in a UILabel line?

Try this :

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{CGSize size;
        if (SYSTEM_VERSION_LESS_THAN(@"7.0")) {
            // code here for iOS 5.0,6.0 and so on
            CGSize fontSize = [text sizeWithFont:[UIFont fontWithName:@"Helvetica" size:17]];
            size = fontSize;
        }
        else {
            // code here for iOS 7.0
            NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                                  [UIFont fontWithName:@"Helvetica Neue" size:19], NSFontAttributeName,
                                                  nil];
            CGRect fontSizeFor7 = [text boundingRectWithSize:CGSizeMake(571, 500)
                                                     options:NSStringDrawingUsesLineFragmentOrigin
                                                  attributes:attributesDictionary
                                                     context:nil];
            size = fontSizeFor7.size;

        }return size.height +30 ;

    }

Get number of characters in one line of UILabel

Maybe you could approach the problem in a different way. You can decide how many characters you allow in one label.

let limitLength = whatever length you want to allow

func textField(username: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    guard let text = username.text else { return true }
    let newLength = text.characters.count + string.characters.count - range.length
    return newLength <= limitLength
}

How to set maximum length for UILabel?

Based on your comment, what you actually implemented would work. You just have to ensure your syntax is correct.

Assuming your getting a string from a database:

NSString *string = stringFromDatabase;
//execute your conditional if statement
if (string.length > 50) { //meaning 51+
    /* trim the string. Its important to note that substringToIndex returns a
    new string containing the characters of the receiver up to, but not 
    including, the one at a given index. In other words, it goes up to 50, 
    but not 50, so that means we have to do desired number + 1. 
    Additionally, this method includes counting white-spaces */

    string = [string substringToIndex:51];
}

Then we must set the labels text, this doesn't happen autonomously. So completely:

NSString *string = stringFromDatabase;
if (string.length > 50) { 
    string = [string substringToIndex:51];
}
self.someUILabel.text = string;

I think the way you are doing it is probably not user friendly. You're getting the string of a UILabel that already has text set and then resetting it. Instead, you should set the desired text to the UILabel before it is called by the delegate

How to limit UILabel's max characters

You can iterate your string indices counting the characters, if it is a chinese character add 2 otherwise add 1. If the count is equal to 16 return the substring up to the current index with "…" at the end. Something like:

extension Character {
    var isChinese: Bool {
        String(self).range(of: "\\p{Han}", options: .regularExpression) != nil
    }
}

---

extension StringProtocol {
    var limitedLenghtLabelText: String {
        var count = 0
        for index in indices {
            count += self[index].isChinese ? 2 : 1
            if count == 16 {
                let upperBound = self.index(after: index)
                return String(self[..<upperBound]) + (upperBound < endIndex ? "…" : "") }
        }
        return String(self)
    }
}

---

"蝙蝠侠喜欢猫女和阿福".limitedLenghtLabelText   // "蝙蝠侠喜欢猫女和…"

"Batman喜欢猫女和阿福".limitedLenghtLabelText  // "Batman喜欢猫女和…"

---

Related Topics