ios - UIPickerView doesn't appear -

in viewcontroller call push, try programmatically display combobox. combobox implement uipickerview delegate protocol , add .xib file.

when run app, can see combobox on screen, when click on it, nothing append. pickerview displayed.

what don't understand, in viewcontroller call modal works fine

// //  combobox.h //  #import <uikit/uikit.h>  @interface combobox : uiviewcontroller<uipickerviewdelegate, uipickerviewdatasource, uitextfielddelegate> {     uipickerview* pickerview;     iboutlet uitextfield* textfield;     nsmutablearray *dataarray; }  -(void) setcombodata:(nsmutablearray*) data; //set picker view items -(void) setplaceholder:(nsstring*) label; @property (retain, nonatomic) nsstring* selectedtext; //the uitextfield text @property (retain, nonatomic) iboutlet uitextfield* textfield; //the uitextfield  @end  // //  combobox.m //   #import "combobox.h"  @implementation combobox @synthesize selectedtext; @synthesize textfield;  - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     return [super initwithnibname:nibnameornil bundle:nibbundleornil]; }  - (void)didreceivememorywarning {     [super didreceivememorywarning]; }   #pragma mark - view lifecycle  - (void)viewdidload {     [super viewdidload]; }  - (void)viewdidunload {     [super viewdidunload]; }  - (bool)shouldautorotatetointerfaceorientation:(uiinterfaceorientation)interfaceorientation {     return (interfaceorientation == uiinterfaceorientationportrait); }   //-- uipickerviewdelegate, uipickerviewdatasource  - (nsinteger)numberofcomponentsinpickerview:(uipickerview *)pickerview; {     return 1; }  - (void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {     textfield.text = [dataarray objectatindex:row];     selectedtext = textfield.text; }  - (nsinteger)pickerview:(uipickerview *)pickerview numberofrowsincomponent:(nsinteger)component; {     return [dataarray count]; }  - (nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component; {     return [dataarray objectatindex:row]; }  //-- combobox   -(void) setcombodata:(nsmutablearray*) data {     dataarray = data;     }  -(void) setplaceholder:(nsstring *)label {     textfield.placeholder = label; }  -(void)doneclicked:(id) sender {     [textfield resignfirstresponder]; //hides pickerview }   - (ibaction)showpicker:(id)sender {      pickerview = [[uipickerview alloc] init];     pickerview.showsselectionindicator = yes;     pickerview.datasource = self;     pickerview.delegate = self;      uitoolbar* toolbar = [[uitoolbar alloc] init];     toolbar.barstyle = uibarstyleblacktranslucent;     [toolbar sizetofit];      //to make done button aligned right     uibarbuttonitem *flexiblespaceleft = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemflexiblespace target:nil action:nil];       uibarbuttonitem* donebutton = [[uibarbuttonitem alloc] initwithtitle:@"done"                                                                    style:uibarbuttonitemstyledone target:self                                                                   action:@selector(doneclicked:)];       [toolbar setitems:[nsarray arraywithobjects:flexiblespaceleft, donebutton, nil]];      //custom input view     textfield.inputview = pickerview;     textfield.inputaccessoryview = toolbar;   }  - (bool)textfieldshouldbeginediting:(uitextfield *)atextfield {     [self showpicker:atextfield];     return yes; }  @end 

the viewdidload of viewcontroller

- (void)viewdidload {     [super viewdidload];      nsmutablearray* serveurarray = [[nsmutablearray alloc] init];     [serveurarray addobject:@"1"];     [serveurarray addobject:@"2"];     [serveurarray addobject:@"3"];      comboserveur = [[combobox alloc] init];     [comboserveur setcombodata:serveurarray];  //assign array combobox     comboserveur.view.frame = cgrectmake(95, 220, 130, 31);  //combobox location , size (x,y,width,height)      [self.view addsubview:comboserveur.view]; } 

thx answers

i assume targeting ios 5.0 , above. since adding view of viewcontroller viewcontroller can use childviewcontroller introduced in ios 5.0.

modify viewdidload method

- (void)viewdidload     {         [super viewdidload];         // additional setup after loading view, typically nib.          combobox *comboserveur = [[combobox alloc]initwithnibname:@"comboboxcontroller" bundle:nil];         [comboserveur setcombodata:@[@"1",@"2",@"3"]];          comboserveur.view.frame = cgrectmake(50.0f, 200.0f, 220.0f, 31.0f);          [self.view addsubview:comboserveur.view];         [self addchildviewcontroller:comboserveur];         [comboserveur didmovetoparentviewcontroller:self];      } 

few steps check

1. make view of combobox viewcontroller freeform masktype uiviewautoresizingnone.
2. check textfield , delegate of textfield connected

demo project