Question

我正在创建一个使用选择器的应用程序，让用户选择年龄和其他一些输入。例如：我有一个按钮年龄，当用户点击它时，选择器显示年龄。我设法为所有输入添加单独的选择器，我怎么遇到为每个选择器设置不同数组的问题。

- (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]; }
}

以上方法对我不起作用！我这样做了吗？

Answer 1

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

听起来pickerview不应该写成thePickerView吗？

return [stagepickerarray objectAtInde:row];

听起来objectAtInde应该是objectAtIndex吗？

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

听起来不是return在某个地方丢失了吗？

Answer 2

为什么不将一个UIPickerView与多个组件一起使用？有点像：

- (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;

}

具有更改值的UIpicker数组

2 个答案: