dataPickerView 在iOS 14和numberPic

一、dataPickerView 在iOS 14下设置textColor失效

1.ios14之前，设置下面这一句就可以更改dataPickerView的字体颜色

[self.datePicker setValue: [UIColor whiteColor] forKey: @"textColor"];

但是更新到新系统iOS 14之后，发现字体颜色设置失效了
经过重重测验，最终找到了解决之路......

2. iOS 14系统下设置dataPickerView的字体颜色，直接调用changeDatePickerViewTextColor就可以啦，over.....

-(void) changeDatePickerViewTextColor {
  if (@available(iOS 13.4, *)) {
      self.datePicker.preferredDatePickerStyle = UIDatePickerStyleWheels;
  }
  //Set white text
  unsigned int outCount;
  int i;
  objc_property_t *pProperty = class_copyPropertyList([UIDatePicker class], &outCount);
  for (i = outCount -1; i >= 0; i--) {
    //Get the name of the property in a loop The property_getName function returns the name of a property
    NSString *getPropertyName = [NSString stringWithCString:property_getName(pProperty[i]) encoding:NSUTF8StringEncoding];
    NSString *getPropertyNameString = [NSString stringWithCString:property_getAttributes(pProperty[i]) encoding:NSUTF8StringEncoding];
    if([getPropertyName isEqualToString:@"textColor"]) {
        [self.datePicker setValue:[UIColor whiteColor] forKey:@"textColor"];
    }
  }
  SEL selector = NSSelectorFromString(@"setHighlightsToday:");
  NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDatePicker instanceMethodSignatureForSelector:selector]];
  BOOL no = NO;
  [invocation setSelector:selector];
  [invocation setArgument:&no atIndex:2];
  [invocation invokeWithTarget:self.datePicker];
 }

二、numberPicker在Android 10下setNumberPickerTextColor失效

1.Android 10之前，设置下面这一句就可以更改numberPicker的字体颜色

SalusUtil.setNumberPickerTextColor(numHours, Color.WHITE);

2.Android 10之后设置dataPickerView的字体颜色

在styles.xml中添加：

<style name="numberPicker_textColor" parent="AppTheme" >
  <item name="android:textColorPrimary">@android:color/white</item>
</style>

然后在您的布局中像这样使用它：

<NumberPicker
   android:id="@+id/numberPicker_hours"
   android:theme="@style/numberPicker_textColor"
   android:layout_width="0dp"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:showDividers="none" >
</NumberPicker>

太难了！！！！！！Android 10这个，作为一个iOS开发，我真的百度了N久，最终在Google上找到了解决方法，以此写个记录吧，让有相同困境的伙伴早点解决问题

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再次发现，Android10失效的本质其实是Android10针对非 SDK 接口的进行了限制，所以有更本质的方法解决setNumberPickerTextColor里面SDK失效的问题（Android10一直走catch）

public static boolean setNumberPickerTextColor(NumberPicker numberPicker,
        int color) {
    final int count = numberPicker.getChildCount();
    for (int i = 0; i < count; i++) {
        View child = numberPicker.getChildAt(i);

        if (child instanceof EditText) {
            try {
                Field selectorWheelPaintField = numberPicker.getClass()
                        .getDeclaredField("mSelectorWheelPaint");
                selectorWheelPaintField.setAccessible(true);
                ((Paint) selectorWheelPaintField.get(numberPicker))
                        .setColor(color);
                Paint paint = (Paint) selectorWheelPaintField
                        .get(numberPicker);
                // paint.setTextAlign(Align.RIGHT);

                ((EditText) child).setTextColor(color);
                /*
                 * ((EditText) child).setPadding(150, 0,0,0); ((TextView)
                 * child).setPadding(150, 0,0,0);
                 */
                numberPicker.invalidate();
                return true;
            } catch (NoSuchFieldException e) {
                Log.w("setNumberPickerTextColor", e);
            } catch (IllegalAccessException e) {
                Log.w("setNumberPickerTextColor", e);
            } catch (IllegalArgumentException e) {
                Log.w("setNumberPickerTextColor", e);
            }
        }
    }
    return false;
}

Android 10（API 级别 29）

如需允许访问非 SDK 接口，请使用以下 adb 命令：

      $ adb shell settings put global hidden_api_policy  1

Android 9（API 级别 28）

如需允许访问非 SDK 接口，请使用以下 adb 命令：

      $adb shell settings put global hidden_api_policy_pre_p_apps  1
      $adb shell settings put global hidden_api_policy_p_apps 1