UIPickerView с несколькими компонентами

Question

Я новичок в Xcode. Теперь я хочу реализовать UIPickerView с двумя столбцами в моем приложении. Первый столбец - номер (например, 1-5), а второй столбец - единица (например, день, неделя). Например, 1 день, 2 дня, 3 недели.

Я попытался следующий код:

- (void)viewDidLoad 
{ 
    repeatLabel.text = @"Never ever"; 
    repeatNoArray= [[NSMutableArray alloc]init]; 
    [repeatNoArray addObject:@"Never"]; 
    for (int i = 1; i<=5; i++) 
    { 
     [repeatNoArray addObject:[NSString stringWithFormat:@"%i",i]]; 
    } 
    timeUnitArray = [[NSMutableArray alloc]initWithObjects:@"ever",nil]; 
    timeUnit1Array = [[NSMutableArray alloc]initWithObjects:@"day",@"week",@"month",@"year",nil]; 
    timeUnit2Array = [[NSMutableArray alloc]initWithObjects:@"days",@"weeks",@"months",@"years",nil]; 
    repeatPicker.delegate = self; 
    repeatPicker.dataSource = self; 
    [super viewDidLoad]; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component 
{ 
    if (pickerView == repeatPicker && component == 0) 
     return [repeatNoArray count]; 
    else if (pickerView == repeatPicker && component == 1) 
    { 
     if ([repeatPicker selectedRowInComponent:0] == 0) 
      return timeUnitArray.count; 
     else if ([repeatPicker selectedRowInComponent:0] == 1) 
      return timeUnit1Array.count; 
     else 
      return timeUnit2Array.count; 
    } 

    return nil; 
}; 

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    if (pickerView == repeatPicker && component==0) 
     return [repeatNoArray objectAtIndex:row]; 

    if (pickerView == repeatPicker && component==1) 
    { 
     if ([repeatPicker selectedRowInComponent:0] == 0) 
      return [timeUnitArray objectAtIndex:row]; 
     else if ([repeatPicker selectedRowInComponent:0] == 1) 
      return [timeUnit1Array objectAtIndex:row]; 
     else 
      return [timeUnit2Array objectAtIndex:row]; 
    } 
    return nil; 
} 

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 
    if (pickerView == repeatPicker) 
    { 
     NSInteger selectedIndex = [repeatPicker selectedRowInComponent:0]; 
     if (component == 0 && !(selectedIndex < 0)) 
     { 
      [repeatPicker reloadComponent:1]; 
      [repeatPicker selectRow:0 inComponent:1 animated:YES]; 
     } 
     else 
     { 
      // do nth 
     } 
     [repeatPicker reloadComponent:1]; 
     NSString *RepeatValue = [repeatNoArray objectAtIndex:[repeatPicker selectedRowInComponent:0]]; 
     NSString *RepeatPeriod = [timeUnitArray objectAtIndex:[repeatPicker selectedRowInComponent:1]]; 
     repeatLabel.text = [[@"Every " stringByAppendingString:RepeatValue]stringByAppendingString: RepeatPeriod]; 
    } 
} 

Он работает идеально, чтобы показать другую вторую колонку, но когда я пытаюсь выбрать новое значение на второй колонке, он дает мне ошибку:

Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]' * First throw call stack: (0x31195f4b 0x3b5d66af 0x310cc533 0x102e71 0x33b7c329 0x33b7f119 0x33e4f223 0x33a3aa5b 0x33b08407 0x33b04021 0x33b03adb 0x33adbab3 0x33e4edbf 0x33b7e0bf 0x3391a6e5 0x33b7dfed 0x33b7e401 0x339fe5b9 0x33921f69 0x310da821 0x310da72f 0x33912f0d 0x339ff225 0x33909011 0x33908da3 0x3358fc6b 0x3358b47b 0x3358b30d 0x3358ad1f 0x3358ab2f 0x3358485d 0x311611cd 0x3115eb71 0x3115eeb3 0x310c9c27 0x310c9a0b 0x35df0283 0x3396d049 0x103871 0x3badeab7) libc++abi.dylib: terminating with uncaught exception of type NSException

Кто-нибудь знает, как мне изменить код?

Answer 1

Я сам нахожу ответ. Я пытаюсь назначить все разные массивы в один массив (repeatArray). Теперь сборщик работает нормально. Ниже приведен обновленный код.

- (void)viewDidLoad 
{ 
    repeatLabel.text = @"Never ever"; 
    repeatNoArray= [[NSMutableArray alloc]init]; 
    [repeatNoArray addObject:@"Never"]; 
    for (int i = 1; i<=1000; i++) 
    { 
     [repeatNoArray addObject:[NSString stringWithFormat:@"%i",i]]; 
    } 
    timeUnitArray = [[NSMutableArray alloc]initWithObjects:@"ever",nil]; 
    timeUnit1Array = [[NSMutableArray alloc]initWithObjects:@"day",@"week",@"month",@"year",nil]; 
    timeUnit2Array = [[NSMutableArray alloc]initWithObjects:@"days",@"weeks",@"months",@"years",nil]; 
    repeatPicker.delegate = self; 
    repeatPicker.dataSource = self; 
    [super viewDidLoad]; 
} 

// returns the number of 'columns' to display. 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
    if (pickerView == repeatPicker) 
     return 2; 
} 

// returns the # of rows in each component.. 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component 
{ 

if (pickerView == repeatPicker && component == 0) 
    return [repeatNoArray count]; 
else if (pickerView == repeatPicker && component == 1) 
{ 
    if ([repeatPicker selectedRowInComponent:0] == 0) 
     repeatArray = timeUnitArray; 
    else if ([repeatPicker selectedRowInComponent:0] == 1) 
     repeatArray = timeUnit1Array; 
    else 
     repeatArray = timeUnit2Array; 
    return [repeatArray count]; 
} 
return 0; 
}; 

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    if (pickerView == repeatPicker && component==0) 
     return [repeatNoArray objectAtIndex:row]; 

    if (pickerView == repeatPicker && component==1) 
    { 
     if ([repeatPicker selectedRowInComponent:0] == 0) 
      repeatArray = timeUnitArray; 
     else if ([repeatPicker selectedRowInComponent:0] == 1) 
      repeatArray = timeUnit1Array; 
     else 
      repeatArray = timeUnit2Array; 
     return [repeatArray objectAtIndex:row]; 
    } 

    return nil; 
} 
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 
    if (pickerView == repeatPicker) 
    { 
     NSInteger selectedIndex = [repeatPicker selectedRowInComponent:0]; 


if (component == 0 && !(selectedIndex < 0)) 
    { 
     [repeatPicker reloadComponent:1]; 
    } 
    else 
    { 
     //do nth 
    } 

    if (component == 0 && row == 0) 
    { 
     [repeatPicker selectRow:0 inComponent:0 animated:YES]; 
     repeatLabel.text = @"Never ever"; 
    } 
    else if(component == 1 && row == 0) 
    { 
     if (component == 0 && row == 0) 
      repeatLabel.text = @"Never ever"; 
    } 
    else 
    { 
     [repeatPicker reloadComponent:1]; 
     NSString *RepeatValue = [repeatNoArray objectAtIndex:[repeatPicker selectedRowInComponent:0]]; 
     NSString *RepeatPeriod = [repeatArray objectAtIndex:[repeatPicker selectedRowInComponent:1]]; 
     repeatLabel.text = [[[@"Every " stringByAppendingString:RepeatValue] stringByAppendingString: @" " ]stringByAppendingString: RepeatPeriod]; 
    } 
}