最近需要做个平板的项目,然后需要直接横屏,有2种实现方式。
1,随着屏幕旋转,布局自动调整。做横竖屏适配
2,强制屏幕横屏,不随着屏幕去调整
第一种方式这里就不做说明了。代码做适配就可以。下面说一下第二种实现方式
颤振为我们提供了方法来控制系统的横竖屏显示
SystemChrome.setPreferredOrientations ([
DeviceOrientation.landscapeLeft,
DeviceOrientation.landscapeRight,
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown
))((_){
});
包含的方向类型! ! ! !但是但是但是这个方法只适用于android在iOS上没有效果,上网查资料有大神封装的颤振插件定位、颤振插件auto_orientation在iOS上都起不到效果,所以打算自己写一个原生文件与颤振进行通讯,实现屏幕旋转。也是笔者在查询资料之后做的一个整合和解释说明
<>强创建iOS原生文件
创建iOS原生文件来实现交互,首先要创建个原生文件。命名为FlutterIOSDevicePlugin。创建文件
<人物> 
创建一个命名为FlutterIOSDevicePlugin。h和命名为FlutterIOSDevicePlugin。米文件,说明一下:FlutterIOSDevicePlugin。h文件选择图片里面模的头文件块创建即可。
创建之后,一起看一下FlutterIOSDevicePlugin.h里面的代码
的ifndef FlutterIOSDevicePlugin_h
#定义FlutterIOSDevicePlugin_h
# import & lt;颤振/Flutter.h>
@ interface FlutterIOSDevicePlugin: NSObject
+ (void) registerWithRegistrar:(NSObject *)注册flutterViewController: (flutterViewController *)控制器;
- (instancetype) newInstance:(NSObject *)注册flutterViewController: (flutterViewController *)控制器;
@end
# endif/* FlutterIOSDevicePlugin_h */
这个不需要过多说明了看一下FlutterIOSDevicePlugin.m的代码
# import & lt;基?Foundation.h>
#进口“FlutterIOSDevicePlugin.h”
@ interface FlutterIOSDevicePlugin () {
NSObject* _registrar;
FlutterViewController * _controller;
}
@end
静态NSString * const CHANNEL_NAME=@“flutter_ios_device”;
静态NSString * const METHOD_CHANGE_ORIENTATION=@“change_screen_orientation”;
静态NSString * const ORIENTATION_PORTRAIT_UP=@“portraitUp”;
静态NSString * const ORIENTATION_PORTRAIT_DOWN=@“portraitDown”;
静态NSString * const ORIENTATION_LANDSCAPE_LEFT=@“landscapeLeft”;
静态NSString * const ORIENTATION_LANDSCAPE_RIGHT=@“landscapeRight”;
@ implementation FlutterIOSDevicePlugin
+ (void) registerWithRegistrar:(NSObject *)注册{
FlutterMethodChannel *=[FlutterMethodChannel频道
methodChannelWithName: CHANNEL_NAME
binaryMessenger:[注册信使]];
FlutterIOSDevicePlugin *实例=[[FlutterIOSDevicePlugin alloc] newInstance:注册flutterViewController: nil);
(注册addMethodCallDelegate:实例通道:通道);
}
+ (void) registerWithRegistrar:(NSObject *)注册flutterViewController:控制器(flutterViewController *) {
FlutterMethodChannel *=[FlutterMethodChannel频道
methodChannelWithName: CHANNEL_NAME
binaryMessenger:[注册信使]];
FlutterIOSDevicePlugin *实例=[[FlutterIOSDevicePlugin alloc] newInstance:注册flutterViewController:控制器);
(注册addMethodCallDelegate:实例通道:通道);
}
- (instancetype) newInstance:(NSObject *)注册flutterViewController:控制器(flutterViewController *) {
_registrar=注册;
_controller=控制器;
回归自我;
}
- (void) handleMethodCall: (FlutterMethodCall *)调用结果:结果(FlutterResult) {
如果([METHOD_CHANGE_ORIENTATION isEqualToString: call.method]) {
NSArray *参数=call.arguments;
NSString *取向[0]=参数;
NSNumber *指数=[NSNumber numberWithInt:(电话。参数[0]intValue]];
NSInteger iOSOrientation;
如果([取向isEqualToString: ORIENTATION_LANDSCAPE_LEFT]) {
iOSOrientation=UIDeviceOrientationLandscapeLeft;
}else if([取向isEqualToString: ORIENTATION_LANDSCAPE_RIGHT]) {
iOSOrientation=UIDeviceOrientationLandscapeRight;
}else if([取向isEqualToString: ORIENTATION_PORTRAIT_DOWN]) {
iOSOrientation=UIDeviceOrientationPortraitUpsideDown;
其他}{
iOSOrientation=UIDeviceOrientationPortrait;
}
[[UIDevice currentDevice] setValue: @ (iOSOrientation) forKey: @“取向”);//[[NSNotificationCenter defaultCenter] postNotificationName: @“FlutterIOSDevicePlugin”对象:零用户信息:@ {@“orientationMask”:指数});//(attemptRotationToDeviceOrientation ui);
结果(nil);
其他}{
结果(FlutterMethodNotImplemented);
}
}
@end
