Re: transparent “multiline” UITextField

Devin Asay devin_asay at
Thu Apr 3 17:13:08 CEST 2014

On Apr 3, 2014, at 12:33 AM, Scott Morrow <scott at>

> I’m trying to make a transparent “multiline” UITextField in iOS.  Unfortunately, it remains opaque both in the simulator and on an actual device.  If I switch the style of the UITextField to “input” then it becomes transparent.  I’m doing something along the lines of:
> mobileControlCreate "multiline", pFieldName
> mobileControlSet pFieldName, "rect", tRect
> mobileControlSet pFieldName, "opaque", "false"
> mobileControlSet pFieldName, "visible", “true"
> I’m suspicious that it may be operator error since I can’t get it working under the last several previous LC versions and I didn’t notice a bug report. Suggestions?
> (tested with LC 6.1.3,  6.5.2,  6.6, 6.7dp1 and 6.6.1rc1 Commercial)


I had puzzled over this before, too. It turns out, a little confusingly, that you have to set the alpha channel on the backgroundColor rather than the opaque property:

  mobileControlSet pFieldName, "backgroundColor", "255,255,255,0"
  mobileControlSet pFieldName, "opaque", false

I tried it with the opaque property set to both true and false; it didn't seem to make any difference. In fact, it worked fine without setting the opaque property.

The old iOS release notes (and the current dictionary entry for mobileControlSet) give a confusing description of the opaque property of mobile native controls:

"Set to false if the control should be rendered with transparency. In particular, set this control to true if you set a backgroundColor that is not fully opaque."

Months ago I had printed out the release notes for closer study. Next to that paragraph I penciled in the comment "?". Indeed.

Can anyone explain what that means?




Devin Asay
Office of Digital Humanities
Brigham Young University

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