如何使用 SDK 7 在 iOS 7 上设置 UIPickerView 的背景颜色？
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How to set the background color of UIPickerView on iOS 7 using SDK 7?
提问by Dmitry
How to set the background color of UIPickerViewon iOS 7using SDK 7 and use a standard picker on iOS 5 and 6? It's transparent by default on iOS 7.
如何UIPickerView在 iOS 7 上使用 SDK 7设置背景颜色并在 iOS 5 和 6 上使用标准选择器？默认情况下，它在 iOS 7 上是透明的。
采纳答案by Dmitry
I have added UIViewunder UIPickerViewwith code:
我加入UIView下UIPickerView的代码：
CGRect framePickerView = CGRectMake(0, self.view.frame.size.height, self.view.frame.size.width, 216);
pickerView = [[[UIView alloc] initWithFrame:framePickerView] autorelease];
pickerView.backgroundColor = [UIColor whiteColor];
[self.view addSubview:pickerView];
[pickerView addSubview:picker];
instead the code:
而是代码：
[self.view addSubview:picker];
回答by Jesse
What's wrong with:
有什么问题：
[picker setBackgroundColor:[UIColor whiteColor]];
I'm assuming you have a reference to the picker view if you're invoking it, and it's a subclass of UIView so backgroundColoris a valid property...
我假设你在调用它时有一个对选择器视图的引用，它是 UIView 的子类，所以backgroundColor是一个有效的属性......
回答by Yanchi
I wanted to write it as a comment, but it would be hard to read :) Sooo....
我想把它写成评论，但很难阅读:) Sooo ....
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 44)]; // your frame, so picker gets "colored"
label.backgroundColor = [UIColor lightGrayColor];
label.textColor = [UIColor blackColor];
label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
label.text = [NSString stringWithFormat:@"%d",row];
return label;
}
Also it doesnt have to be only label, I think you can insert other subviews there as well...
It works on iOS7 as far as I know 
此外，它不必只是标签，我认为您也可以在那里插入其他子视图......据我所知，它适用于 iOS7
回答by arlomedia
This worked for me, in iOS 7.1:
这对我有用，在 iOS 7.1 中：
[[UIPickerView appearance] setBackgroundColor:[UIColor whiteColor];
This changes the color of all pickers. You can put a conditional around it if you only want this to run on devices with iOS 7.
这会更改所有选择器的颜色。如果您只希望它在装有 iOS 7 的设备上运行，您可以在它周围放置一个条件。
回答by AamirR
Even though I set UIPickerView.backgorundColor, but I had weird background color.
即使我设置了 UIPickerView.backgorundColor，但我的背景颜色很奇怪。
removingfollowing line fixed the issue:
删除以下行修复了问题：
UITextField.keyboardAppearance = .dark
Or just reset keyboardAppearanceback to default, like so:
或者只是重置keyboardAppearance回默认值，如下所示：
UITextField.keyboardAppearance = .default
回答by Diesel
For anyone working in swift, and potentially using multiple pickers:
对于任何在 swift 中工作并可能使用多个选择器的人：
pickerView1.backgroundColor = UIColor.darkGrayColor()
pickerView2.backgroundColor = UIColor.greenColor()
Xcode 7.3
Xcode 7.3
