iphone - UITextField inputview to pop up UIPickerView displaying question mark in pickerview -

here .h file

when run code , select text field, pickerview pop's question marks in when select question mark correct values in text field

#import <uikit/uikit.h>  #import "scrollableviewcontroller.h" #import "mibackgroundtapdelegate.h"   //@interface activapc1 : uiviewcontroller { @interface activapc1 : scrollableviewcontroller <mibackgroundtapdelegate, uipickerviewdelegate, uipickerviewdatasource>{     uitextfield *amplitude1; uitextfield *rate1; uitextfield *pulse_width1; uitextfield *impedance1;  iboutlet uitextfield *configuration; nsarray *mode; 

}

@property (nonatomic, retain) iboutlet uitextfield *amplitude1; @property (nonatomic, retain) iboutlet uitextfield *rate1; @property (nonatomic, retain) iboutlet uitextfield *pulse_width1; @property (nonatomic, retain) iboutlet uitextfield *impedance1;  -(ibaction)next; -(ibaction)skip; -(ibaction)home; -(ibaction)select;  -(ibaction)textfielddoneediting:(id) sender;  @end 

here .m file

i not able understand why getting question mark please me

#import "activapc1.h" #import "dbsviewcontroller.h" #import "activapc2.h" #import "apcoption.h"    @implementation activapc1  @synthesize amplitude1; @synthesize rate1; @synthesize pulse_width1; @synthesize impedance1;  const int mymodepicker = 3002;  -(void)viewdidload { self.svscrollviewm.contentsize = cgsizemake(320, 416); [self registerforeditingevents:amplitude1]; [self registerforeditingevents:rate1]; [self registerforeditingevents:pulse_width1]; [self registerforeditingevents:impedance1];  uipickerview *modepicker = [[uipickerview alloc] initwithframe:cgrectzero]; modepicker.tag = mymodepicker; modepicker.delegate = self; modepicker.datasource = self; [modepicker setshowsselectionindicator:yes]; configuration.inputview = modepicker; [modepicker release];  [super viewdidload];      //prepare data pickers     mode = [nsarray arraywithobjects:@"voltage",@"current",nil];    [mode retain];  //mode = [[nsmutablearray alloc] init]; //[mode addobject] }  //********picker view code**************  #pragma mark -  #pragma mark uipickerviewdelegate  -(nsstring *)pickerview:(uipickerview *)pickerview titileforrow:(nsinteger)row forcomponent:(nsinteger)component reusingview:(uiview *)view {     if(pickerview.tag == mymodepicker)     {         return [mode objectatindex:row];     }     return @"unknown title";  }  -(void) pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {         if(pickerview.tag == mymodepicker)         {             configuration.text = (nsstring *)[mode objectatindex:row];         } }  #pragma mark -  #pragma mark uipickerviewdatasource  - (nsinteger)numberofcomponentsinpickerview:(uipickerview *)pickerview {     return 1; }  - (nsinteger)pickerview:(uipickerview *)pickerview    numberofrowsincomponent:(nsinteger)component {     if(pickerview.tag == mymodepicker)     {         return mode.count; } return 1; }  #pragma mark -  //**********picker view code end************  -(ibaction) backgroundtap:(id) sender{ [self.amplitude1 resignfirstresponder]; [self.rate1 resignfirstresponder]; [self.pulse_width1 resignfirstresponder]; [self.impedance1 resignfirstresponder]; }  -(ibaction) textfielddoneediting:(id)sender{ [sender resignfirstresponder]; }  -(ibaction)home { dbsviewcontroller *dbs = [[dbsviewcontroller alloc] initwithnibname:nil bundle:nil]; [self presentmodalviewcontroller:dbs animated:yes]; }  -(ibaction)skip { activapc2 *activapc2 = [[activapc2 alloc] initwithnibname:nil bundle:nil]; [self presentmodalviewcontroller:activapc2 animated:yes]; }  -(ibaction)next { activapc2 *activapc2 = [[activapc2 alloc] initwithnibname:nil bundle:nil]; [self presentmodalviewcontroller:activapc2 animated:yes]; }  -(ibaction)select { apcoption *apcoption = [[apcoption alloc] initwithnibname:nil bundle:nil]; [self presentmodalviewcontroller:apcoption animated:yes]; }     - (void)didreceivememorywarning { // releases view if doesn't have superview. [super didreceivememorywarning];  // release cached data, images, etc. aren't in use. }  - (void)viewdidunload { [super viewdidunload]; // release retained subviews of main view. // e.g. self.myoutlet = nil; }   - (void)dealloc { [mode release]; [super dealloc]; }    @end 

the pickerview needs title not titile. delegate method returns string not have reusingview: parameter. since don't implement delegate method picker displays question marks.

-(nsstring *)pickerview:(uipickerview *)pickerview titileforrow:(nsinteger)row forcomponent:(nsinteger)component reusingview:(uiview *)view; 

i believe should be:

-(nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component;