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copied!<p>I wonder if you could use the methods in the <a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html" rel="noreferrer">NSString UIKit Additions</a> to figure out how much fits into label A.</p> <p>A crude way might be to start with the first character of your text and test for the size it would take up (<code>-sizeWithFont:forWidth:lineBreakMode:</code> maybe?) and then keep adding characters one at a time until it doesn't fit into your label A any more.</p> <p>I hope somebody else can come up with a better way to do this, but the above should work.</p> <p><strong>Update</strong></p> <p>Last night I looked a bit into Core Text for my own app and came across <a href="http://developer.apple.com/library/ios/#documentation/Carbon/Reference/CTFramesetterRef/Reference/reference.html" rel="noreferrer"><code>CTFramesetterSuggestFrameSizeWithConstraints</code></a>. You could maybe use this to figure out how much of your string fits into the label, by looking at the <code>fitRange</code> in that function.</p> <p><strong>Update 2:</strong></p> <p>I think this should work, but I have just typed this in here, so it may not even compile:</p> <pre><code>UIFont *uiFont = [UIFont systemFontOfZise:13.0f]; // whichever font you're using CTFontRef ctFont = CTFontCreateWithName((CFStringRef)uiFont.fontName, uiFont.pointSize, NULL); NSDictionary *attr = [NSDictionary dictionaryWithObject:(id)ctFont forKey:(id)kCTFontAttributeName]; CFRelease(ctfont); NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:yourLabelText attributes:attr]; CTFrameSetterRef frameSetter = CTFrameSetterCreateWithAttributedString((CFAttributedStringRef)attrString); [attrString release]; CFRange fitRange; CTFrameSetterSuggestFrameSizeWithConstrains( frameSetter, CFRangeMake(0, 0), NULL, CGSizeMake(labelWidth, labelHeight), &fitRange); CFRelease(frameSetter); CFIndex numberOfCharactersThatFit = fitRange.length; </code></pre>

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