CTFrameGetVisibleStringRange() returns 0 - objective-c

Question

I have this code that generates an array of viewController while reading an NSAttributedString. After the first cycle, the function CTFrameGetVisibleStringRange() returns 0 even if there is more text to display.
- (void)buildFrames
{
/*here we do some setup - define the x & y offsets and create an empty frames array */
float frameXOffset = 20;
float frameYOffset = 20;
self.frames = [NSMutableArray array];
//buildFrames continues by creating a path and a frame for the view's bounds (offset slightly so we have a margin).
CGMutablePathRef path = CGPathCreateMutable();
// create an insect rect for drawing
CGRect textFrame = CGRectInset(self.bounds, frameXOffset, frameYOffset);
CGPathAddRect(path, NULL, textFrame );// add it to the path
// Create a frame setter with my attributed String
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributedString);
//This section declares textPos, which will hold the current position in the text.
//It also declares columnIndex, which will count how many columns are already created.
int textPos = 0;
int columnIndex = 0;
while (textPos < [attributedString length]) {
//The while loop here runs until we've reached the end of the text. Inside the loop we create a column bounds: colRect is a CGRect which depending on columnIndex holds the origin and size of the current column. Note that we are building columns continuously to the right (not across and then down).
CGPoint colOffset = CGPointMake(frameXOffset , frameYOffset);
CGRect columnRect = CGRectMake(0, 0 , textFrame.size.width, textFrame.size.height);
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, colRect);
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(textPos, 0), path, NULL);
CFRange frameRange = CTFrameGetVisibleStringRange(frame);
// MY CUSTOM UIVIEW
LSCTView* content = [[[LSCTView alloc] initWithFrame: CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)] autorelease];
content.backgroundColor = [UIColor clearColor];
content.frame = CGRectMake(colOffset.x, colOffset.y, columnRect.size.width, columnRect.size.height) ;
/************* CREATE A NEW VIEW CONTROLLER WITH view=content *********************/
textPos += frameRange.length;
CFRelease(path);
columnIndex++;
}
}

Answer 1

Did you change alignment for attributedString? I had this samme issue and found that it occurs in some cases when text alignment is set to kCTJustifiedTextAlignment, it should works fine with rest types.