Question

我希望在自定义文本后填充我的选择器视图。当我可以用数组填充它时，我无法更改它的文本颜色。我到处搜索，我发现它们都是分开的，或者它们已经改变了文本颜色，或者用数组填充它。以下是我试过的代码。

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [self.CityList count];
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 44)];
    label.textColor = [UIColor whiteColor];
    label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
    label.textAlignment = NSTextAlignmentCenter;
    if (row == 0) 
    {
        label.text = self.CityList[0];
    }
    else if (row == 1) 
    {
        label.text = self.CityList[1];
    }
    else if (row == 2) 
    {
        label.text = self.CityList[2];
    }
    else if (row == 3) 
    {
        label.text = self.CityList[3];
    }
    else if (row == 4) 
    {
        label.text = self.CityList[4];
    }
    else if (row == 5) 
    {
        label.text = self.CityList[5];
    }
    return label;
}

这段代码实际上运行正常但是当我的数组中有太多代码时，以这种方式实现它绝对没有效率。请建议我一个有效的方法。

Answer 1

像这样改变你的方法：

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{

    UILabel *label = (UILabel *)view;
    //Check if the current view requested is a reused one, If not then create a new one
    if (!label)
    {
        label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 44)];
    }

    label.textColor = [UIColor whiteColor];
    label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
    label.textAlignment = NSTextAlignmentCenter;

    //Assign the text of the label to the NSString at the index of "row" from your data array
    label.text = self.CityList[row];

    return label;
}

Answer 2

我刚修好它，我发现我出错的地方无法直接使用数组进行分配。我已将我的数组属性分配给弱。在我把它改成强大的......后，它工作正常......;）

如何在更改文本颜色后使用数组填充UIpickerView？

2 个答案: