ios - UIPickerView not showing data correctly (Only Show "?") -

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forgive me if question has been discussed previously.
have problem displaying data in uipickerview, it display question mark "?".

header file.h

#import <uikit/uikit.h> @interface custompickerviewcontroller : uiviewcontroller <uipickerviewdelegate, uipickerviewdatasource> {     nsmutablearray *arraycolors; }  @property (strong, nonatomic) iboutlet uipickerview *kotapicker;  @end

impl.m

- (nsinteger)numberofcomponentsinpickerview:(uipickerview *)pickerview {     return 1; }  - (nsinteger)pickerview:(uipickerview *)pickerview numberofrowsincomponent:(nsinteger)component {     return [arraycolors count]; }  - (nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row {     return [arraycolors objectatindex:row]; }  - (void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {     nslog(@"the data %@", [arraycolors objectatindex:row]); } - (void)viewdidload {     [super viewdidload];     arraycolors = [[nsmutablearray alloc] init];     [arraycolors addobject:@"red"];     [arraycolors addobject:@"orange"];     [arraycolors addobject:@"yellow"];     [arraycolors addobject:@"green"];     [arraycolors addobject:@"blue"];     [arraycolors addobject:@"indigo"];     [arraycolors addobject:@"violet"];     // additional setup after loading view nib. }

ok, problem solved, problem incorrect delegate method,

the method have used (for loading data) not delegate method,

- (nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row

try method instead, (must work)

-(nsstring *) pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component{      return [arraycolors objectatindex:row]; }

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