iOS13 适配 夜间模式（深色模式 DarkMode）与其他

iOS13 适配 夜间模式与其他

夜间模式
其他问题:presentViewController
###一 ：夜间/深色模式 DarkMode

夜间模式是iOS13的重要更新之一，随之而来的是我们能从系统设置中“显示与亮度”中选择“浅色”、“深色”两种模式，并且可以设置自动切换。（“控制中心”亮度调节中也可直接调节）

已知问题：在系统设置为深色模式时候，无法更改StateBar颜色

如果不想适配深色模式 （1）.直接在项目的plist文件中设置 UIUserInterfaceStyle UIUserInterfaceStyleLight
（2）.在每个UIViewController或者BaseViewController(如果自己有的话)，中设置 if (@available(iOS 13.0, *)){ self.overrideUserInterfaceStyle = UIUserInterfaceStyleLight; }
适配深色模式 首先我们要看一下显示模式的枚举值
typedef NS_ENUM(NSInteger, UIUserInterfaceStyle) {
UIUserInterfaceStyleUnspecified,
UIUserInterfaceStyleLight,
UIUserInterfaceStyleDark,
} API_AVAILABLE(tvos(10.0)) API_AVAILABLE(ios(12.0)) API_UNAVAILABLE(watchos);
当前API还没有提供浅色/深色模式切换时的通知，但是为UIColor添加了新方法： + (UIColor *)colorWithDynamicProvider:(UIColor * (^)(UITraitCollection *))dynamicProvider; 该方法通过一个block返回颜色,根据其中UITraitCollection参数,我们可以获取到当前系统的UIUserInterfaceStyle. 这个方法会在每次系统模式改变后回调,所以我想,我可以在一个颜色中去为当前界面做监听.

Xcode 11为xcassets带来更新以自动读取加载浅色/深色模式的资源,只要修改资源Appearances属性,来设置是否要支持浅色/深色模式,以及资源内容即可,[UIImage imageNamed:@""]会自动加载浅色/深色资源. image

最后上一段 UIViewController 截图 UIViewController

最后最后上一段 UIViewController 代码

#import “DarkModeViewController.h”

@interface DarkModeViewController ()
{
UIImageView *_iv2;
UIUserInterfaceStyle _userInterfaceStyle;
}
@end

@implementation DarkModeViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  __weak typeof(self)weakSelf = self;
  UIColor *backgroundColor = [UIColor colorWithDynamicProvider:^UIColor * _Nonnull(UITraitCollection * traitCollection) {
  self->_userInterfaceStyle = traitCollection.userInterfaceStyle;
  [weakSelf performSelector:@selector(traitCollectionChanged:) withObject:traitCollection];
  if (traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark) {
  return [UIColor blueColor];
  }
  return [UIColor yellowColor];
  }];
  self.view.backgroundColor = backgroundColor;

  UIImageView *iv = ({
  UIImageView *imageView = [[UIImageView alloc] init];
  [imageView setBackgroundColor:[UIColor clearColor]];
  [imageView setFrame:CGRectMake(20, 100, 100, 100)];
  imageView.image = [UIImage imageNamed:@“icon_star”];
  imageView;
  });
  [self.view addSubview:iv];

  _iv2 = ({
  UIImageView *imageView = [[UIImageView alloc] init];
  [imageView setBackgroundColor:[UIColor clearColor]];
  [imageView setFrame:CGRectMake(20, 240, 100, 100)];
  imageView;
  });
  [self.view addSubview:_iv2];
  [self iv2updateImage];
  }

• (void)traitCollectionChanged:(UITraitCollection *)traitCollection{
  NSLog(@“traitCollectionChanged:%ld”,traitCollection.userInterfaceStyle);
  [self iv2updateImage];

}

• (void)iv2updateImage {
  NSLog(@“iv2updateImage:%ld”,_userInterfaceStyle);
  if (_userInterfaceStyle == UIUserInterfaceStyleDark) {
  _iv2.image = [UIImage systemImageNamed:@“star.circle.fill”];
  }else{
  _iv2.image = [UIImage systemImageNamed:@“star.circle”];
  }
  }
  @end
  ###二 ：其他问题

presentViewController modalPresentationStyle参数有 iOS12 之前的UIModalPresentationFullScreen改为了UIModalPresentationPageSheet, 在需要presentViewController FullScreen样式,需要提前设置