修改 UIImagePickerController 选择照片状态栏颜色及导航栏按钮标题字体颜色

1、新建一个类继承自: UIImagePickerController

2、在新建的类中重写以下方法

#pragma mark status bar style
- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

#pragma mark navigationBar tintColor & title textColor

- (instancetype)init {
self = [super init];
if (self) {
    self.navigationBar.tintColor = [UIColor whiteColor];
    [self.navigationBar setTitleTextAttributes:@{
                                                UITextAttributeTextColor : [UIColor whiteColor], UITextAttributeFont:[UIFont systemFontOfSize:17]
                                                }];
}
return self;
}