UILabel truncate text not working - objective-c

Question

I set the numberOfLines to 1 in the IB, but when I set the text to a long string, it doesn't truncate. If I set the numberOfLines to 2, the truncate works fine.What should I do to truncate a long string into a single line?

Answer 1

simple, set the following properties:
label.adjustsFontSizeToFitWidth = NO;
label.lineBreakMode = NSLineBreakByTruncatingTail;

Answer 2

If you're using attributed string and having set paragraph style to the attributed string: make sure you're passing paragraphStyle.lineBreakMode = .byTruncatingTail.

Answer 3

If using auto layout, in my case, there was a constraint missing. The UILabel grows its width if no constraint is set on its width/trailing. Once its width is limited, for instance to its superview, the truncation occurs.

Answer 4

You probably have a constraint on a label in that section that is making things go haywire.
Double check your constraints or remove them for that label or other controls in that section.
The storyboard option for a label: "Line Breaks:Truncate Tail" will to the work you are looking for.

Answer 5

If you set the label's autoshrink to "Fixed Font Size" in IB, you will always get a truncatation when the string width beyond the label width. I guess you happened to set that to "Minimum Font Scale" or "Minimum Font Font", which will lead a resizing when the string is too long.
(Xcode 4.5, other version of Xcode and IB may be different property name)

Answer 6

I make two functions, that will help you to do your work.
Basic:
This solution I made for task:
"minimize font to my min size of font and then put as much info, as possible, but not bigger then maximum width"
takeFineFont... function parameters:
(UIFont*)font - font of the your label (titleLabel.font)
(NSString*)string - text in your label (titleLabel.text)
(CGSize)limitStringSize - limit size.
limitStringSize.width - width limit of your label (Upper limit)
limitStringSize.height - height limit of your label (Lower limit)(actually, size of font)
-(UIFont*)takeFineFontSize:(UIFont*)font
forText:(NSString*)string
andLimit:(CGSize)limitStringSize{
UIFont* resultFont = [UIFont fontWithName:[font fontName] size:[font pointSize]];
if(limitStringSize.width != 0 && limitStringSize.height != 0){
CGSize currentSize = [string sizeWithFont:resultFont];
while(/* change font width with upper bound */
currentSize.width > limitStringSize.width
&&
/* change font height with lower bound */
currentSize.height > limitStringSize.height){
/*change height and take new width*/
currentSize.height -= 1;
currentSize.width = [string sizeWithFont:[resultFont fontWithSize:currentSize.height]].width;
}
resultFont = [resultFont fontWithSize:currentSize.height];
}
return resultFont;
}
-(double)takeFineWidthForFont:(UIFont*)font
forString:(NSString*)string
andLimit:(double)widthLimit{
return MIN([string sizeWithFont:font].width, widthLimit);
}
Suppose, that you have big string in UILabel* titleLabel
And you define somewhere:
#define maximumLengthOfYourLabel 300
#define minimumSizeOfFont 14
what you will do now? just do this peace of code:
-(void)updateTitleLabelWithBigText:(NSString*)string{
/*change text*/
self.titleLabel.text = string;
/*take pretty small font*/
self.titleLabel.font = [self takeFineFontSize:self.titleLabel.font
forText:self.titleLabel.text
andLimit:CGSizeMake(maximumLengthOfYourLabel,minimumSizeOfFont)
];
/*if your text still big, take minimal width and trunctate it*/
self.titleLabel.width = [self takeFineWidthForFont:self.titleLabel.font
forString:self.titleLabel.text
andLimit:maximumLengthOfYourLabel];
self.titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;
}

Answer 7

Ensure you are not calling sizeToFit() on your label. It will override the label and constraint settings.

Answer 8

set numberOfLines to 0, this will let you expand uilabel content vertially without truncating its width.

Answer 9

Perhaps this method can help you:
[myLabel sizeToFit];
The label won't be truncated but it will adjust the label size to fit in one line.