ios - Selection of Popup Button clearing UI Text Field -

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i've been developing programming user can select list of fields popup buttons, press calculate button , depending on choices, string of text gets outputted uitext field.

however text field cleared when user starts selecting other choices in popup button before pressing select button.

is there anyway possible?

just right code in place happens: 

/*you can replace thetextfieldyouaretalkingabout 1 talking about*/  thetextfieldyouaretalkingabout.text = ""

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