objective c - Set UITextField to a "selected state" upon dismissing an alert -

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i'm practicing on ios development , i'm making bmi calculator app.

apart labels, view includes 2 uitextfields - height_textfield , weight_textfield, , uibutton calculatebmi.

i have implemented if/else conditions catch empty text fields. meaning if user leaves height_textfield or weight_textfield or both blank, uialertview pops telling user fill in required fields.

help:

i want respective uitextfield "selected" or in "editable" state (cursor , keyboard appears , ready input) upon dismissing alert. have tried adding protocol .h file , implementing the

- (void)alertview:(uialertview *)alertview clickedbuttonatindex:(nsinteger)buttonindex

and think idea might implementing code relevant "[self.height_textfield editingmode??]" in method can't figure out.

this source code bmicalculatorviewcontroller.m file:

http://pastebin.com/liwbscng

i have not touched .h file (no variables or methods declared there.)

thank in advance kind help/solutions. if have more time spare, tips , best practices appreciated well! thanks!

becomefirstresponder method need call on textfield , bring in editing mode.

- (void)alertview:(uialertview *)alertview clickedbuttonatindex:(nsinteger)buttonindex     {       [self.height_textfield becomefirstresponder];     }

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