Ios 与UIPickerView有问题

所以我在使用UIPickerView时遇到了一个奇怪的错误。在开始编写代码之前，对应用程序的基本解释如下：

此应用程序使用UISegmentedControl从几种不同的可能性中进行选择。根据分段控件的选择，UIPickerView将填充不同的数组。选择器视图保证有两个（不多也不少）组件。阵列大小不同，这就是我遇到的问题。我在代码中设置了一些测试，以将值保持在数组的范围内，但有些东西工作不正常

现在进入代码：

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSMutableArray *array;
    int x = self.segmentController.selectedSegmentIndex;

    if (x == 0) {
        array = [NSMutableArray arrayWithArray:self.length];
    }
    else if (x == 1) {
        array = [NSMutableArray arrayWithArray:self.time];
    }
    else if (x == 2) {
        array = [NSMutableArray arrayWithArray:self.speed];
    }

    //component == 0 has no problems whatsoever
    if (component == 0) {
        if (row < [array count]){
            self.label1.text = [array objectAtIndex:row];
            self.component0 = row;
        }
        else {
            self.label1.text = [array objectAtIndex:[array count] - 1];
            self.component0 = (NSInteger)([array count] - 1);
        }
    }
    //component == 1 has problems, it always thinks that the row number is less than the array count
    else if (component == 1) {
        if (row < [array count]){
            self.label2.text = [array objectAtIndex:row];
            self.secondComponent = row;
        }
        else {
            self.label2.text = [array objectAtIndex:[array count] - 1];
            self.secondComponent = (NSInteger)([array count] - 1);
        }
    }
    else {
        NSLog(@"ERROR: Components out of range");
    }

    //If I comment out this part, the program works as expected
    if (x == 0) {
        [self convertLength];
    }
    else if (x == 1) {
        [self convertTime];
    }
    else if (x == 2) {
        [self convertSpeed];
    }
}

其他有用信息： 长度数组计数：8 时间数组计数：9 速度阵列计数：8

---

当我记录变量时，它们的行为符合预期，在我尝试访问所述数组中的任何数据之前，它们将其值更改为在“控制器数组”的范围内，但无论出于何种原因，第二个组件都希望访问不包含在数组中的索引。

如何创建pickerView的内容？您可以将内容设置为最大数组的长度吗？我更新了问题以包含相关代码。

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
    return 2;
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    int x = 0;

    if (self.segmentController.selectedSegmentIndex == 0) {
        x = [self.length count];
    }
    else if (self.segmentController.selectedSegmentIndex == 1)
    {
        x = [self.time count];
    }
    else if (self.segmentController.selectedSegmentIndex == 2)
    {
        x = [self.speed count];
    }

    return x;
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *string;
    NSArray *array = [[NSArray alloc] init];
    if (self.segmentController.selectedSegmentIndex == 0) {
        array = [NSArray arrayWithArray:self.length];
    }
    else if (self.segmentController.selectedSegmentIndex == 1)
    {
        array = [NSArray arrayWithArray:self.time];
    }
    else if (self.segmentController.selectedSegmentIndex == 2)
    {
        array = [NSArray arrayWithArray:self.speed];
    }
    if (row >= [array count]) {
        string = [array objectAtIndex:[array count] - 1];
        NSLog(@"Out of Range");
    }
    else {
        string = [array objectAtIndex:row];
    }

    return string;
}

- (IBAction)segmentDidChange:(id)sender {
    [self.pickerView reloadAllComponents];
    [self pickerView:self.pickerView didSelectRow:self.component0 inComponent:0];
    [self pickerView:self.pickerView didSelectRow:self.secondComponent inComponent:1];
}