ios - App crashing without stacktrace on pickerview with textfield -

i'm still working on getting uipickerview when trying edit textfield, app crashes without stacktrace. instead of stacktrace shows usual ((lldb)) , nothing

#import "testviewcontroller.h" #import "findclasses.h"  @interface testviewcontroller () @property uipickerview *picker; @property nsarray *pickerarray; @property (nonatomic, strong) findclasses *finder; @end  @implementation testviewcontroller  @synthesize finder = _finder;  - (findclasses *)finder {     if (!_finder) _finder = [[findclasses alloc] init];     return _finder; }  - (void)viewdidload {     [super viewdidload];      self.pickerarray = [self.finder findclassesintimetable];      self.classfield.delegate = self;     self.picker = [[uipickerview alloc] init];     self.picker.delegate = self;     self.picker.datasource = self;     self.classfield.inputview = self.picker;     // additional setup after loading view. }  - (bool)textfieldshouldbeginediting:(uitextfield *)textfield  {     [textfield becomefirstresponder];     return yes; }  - (bool)textfieldshouldreturn:(uitextfield *)textfield {     return yes; }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  #pragma mark - uipickerview method implementation  -(nsinteger)numberofcomponentsinpickerview:(uipickerview *)pickerview{     return 1; }   -(nsinteger)pickerview:(uipickerview *)pickerview numberofrowsincomponent:(nsinteger)component{     return self.pickerarray.count; }   -(nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component{     return [self.pickerarray objectatindex:row]; } 

does why keeps happening? thanks.

i faced similar issue , resolved including code.

- (bool)textfieldshouldreturn:(uitextfield *)textfield  { [self. textfield resignfirstresponder]; //once user clicks return field on number pad, resignsfirstresponder "textfield" double delayinseconds = 0.3; //set delaytimer .3 seconds dispatch_time_t poptime = dispatch_time(dispatch_time_now, delayinseconds * nsec_per_sec); //set pop time dispatch_after(poptime, dispatch_get_main_queue(), ^(void){ [self openpickerview]; }); //open pickerview after .3 sec time delay return yes; //bool function hence return either true or false. in case, true. }  - (void)openpickerview { [uiview beginanimations:nil context:nil]; //begin animation set nil [uiview setanimationduration:0.3]; //animation duration in 0.3 sec pickerviewcontainer.frame=cgrectmake(0, 200, 320, 261); //open picker view mentioned x axis,y axis, width,height details [uiview commitanimations]; //commit animation }