如何在iOS 7下更改UIPickerView中文本的颜色？ [英] How do I change the color of the text in a UIPickerView under iOS 7?

问题描述

我知道 pickerView：viewForRow：forComponent：reusingView 方法，但是当使用视图时传入 reusingView：如何更改它以使用不同的文本颜色？如果我使用 view.backgroundColor = [UIColor whiteColor]; 将不再显示任何视图。

I'm aware of the pickerView:viewForRow:forComponent:reusingView method, but when using the view it passes in reusingView: how do I change it to use a different text color? If I use view.backgroundColor = [UIColor whiteColor]; none of the views show up anymore.

推荐答案

委托方法中有一个更优雅的功能：

There is a function in the delegate method that is more elegant:

Objective-C：

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSString *title = @"sample title";
    NSAttributedString *attString = 
        [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];

    return attString;
}

如果你想改变选择栏的颜色，我发现我必须将2个单独的 UIViews 添加到包含 UIPickerView 的视图中，间隔35磅，选择器高度为180。

If you want to change the selection bar colors as well, I found that I had to add 2 separate UIViews to the view containing the UIPickerView, spaced 35 pts apart for a picker height of 180.

Swift 3：

func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {

    let string = "myString"
    return NSAttributedString(string: string, attributes: [NSForegroundColorAttributeName:UIColor.white])
}

Swift 4：

func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {

    let string = "myString"
    return NSAttributedString(string: string, attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])
}

Swift 4.2：

func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {

    let string = "myString"
    return NSAttributedString(string: string, attributes: [NSAttributedString.key.foregroundColor: UIColor.white])
}

请记住使用方法时：您不需要实现 titleForRowInComponent（）因为在使用 attributionTitleForRow（）时从未调用过。

Remember when you use the method: You don't need to implement titleForRowInComponent() as it is never called when using attributedTitleForRow().

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