具有变化值的 UIpicker 数组

Question

我正在制作一个应用程序，它使用选择器让用户选择年龄和其他一些输入。例如：我有一个按钮年龄，当用户单击它时，选择器会显示年龄。我设法为所有输入添加单独的选择器，但是我在为每个选择器设置不同的数组时遇到问题。

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    if (pickerview == picker) {
        return [pickerViewArray objectAtIndex:row];
    }
    else if (pickerview == stagepicker)
        return [stagepickerarray objectAtInde:row];
    }
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    if (thePickerView == picker){ return [pickerViewArray count]; }
    else if (thePickerView == stagepicker){ [stagepickerarray count]; }
}

上面的方法对我不起作用！我这样做对吗？

Answer 1

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    if (pickerview == picker) {

听起来不是应该将 pickerview 写成 thePickerView 吗？

return [stagepickerarray objectAtInde:row];

是不是听起来 objectAtInde 应该是 objectAtIndex ？

else if (thePickerView == stagepicker){ [stagepickerarray count]; }

听起来是不是好像某处缺少 return ？

Answer 2

为什么不将一个 UIPickerView 与多个组件一起使用？大致如下：

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

NSInteger numberOfRows;

if (component == 0) {
     numberOfRows = [anArray count];
}
else if(component == 1) { 
    numberOfRows = [anotherArray count];
}
else { 
    numberOfRows = [aThirdArray count];
}

return numberOfRows;

}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

NSString *stringIndex = [NSString stringWithFormat:@"TEST"];
if(component == 0) {

   return stringIndex = [anArray objectAtIndex:row];
}

else if(component == 1) {
    return stringIndex = [anotherArray objectAtIndex:row];
}

else {
   return stringIndex = [aThirdArray objectAtIndex:row];
}

return stringIndex;

}