Scrolling UILabel like a marquee in a subview

Question

I have a UILabel in the main view with text - \"Very Very long text\". The proper width to this would be 142, but i\'ve shortened it to 55.

Basical

Answer 1

Apparently the culprit was AutoLayout.

I have no clue why, but once I unchecked "Use Autolayout" for the view in the XIB, everything started working as expected. Setting tempLblFrame.origin.x = -_lblLongText.intrinsicContentSize.width; was working properly and so was the scroll.

Still, a better explanation for this would surely help!!

EDIT: Solution with AutoLayout -

    //Make UIView for Label to sit in
    CGRect tempLblFrame = _lblLongText.frame;
    UIView *lblView = [[UIView alloc] initWithFrame:tempLblFrame];

    //#CHANGE 1 Removing all constraints 
    [_lblLongText removeConstraints:_lblLongText.constraints]; 

    //Add label to UIView at 0,0 wrt to new UIView
    tempLblFrame.origin.x = 0;
    tempLblFrame.origin.y = 0;
    //Set Full length of Label so that complete text shows (else only truncated text will scroll)
    tempLblFrame.size.width = _lblLongText.intrinsicContentSize.width;

    //#CHANGE 2 setting fresh constraints using the frame which was manually set 
    [_lblLongText setTranslatesAutoresizingMaskIntoConstraints :YES];
    [_lblLongText setFrame:tempLblFrame];
    [_lblLongText removeFromSuperview];
    [lblView addSubview:_lblLongText];