ios 相机界面强制横屏

IOS调用系统的相机默认是竖屏的，网上找了很多方法强制横屏都无效，以下代码经测试兼容ios78

自定义一个UIImagePickerController并且覆盖以下方法：

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

    returnUIInterfaceOrientationLandscapeLeft;

}

- (NSUInteger)supportedInterfaceOrientations{

    returnUIInterfaceOrientationMaskLandscape;

}

- (BOOL)shouldAutorotate {

    returnYES;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

    if(UIInterfaceOrientationIsLandscape(interfaceOrientation)) {

        returnYES;

    } else {

        returnNO;

    }

}

要兼容ios8还需要在delegate中加入以下代码

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window

{

    NSString* strSubClass = [NSStringstringWithUTF8String:object_getClassName(window.rootViewController.presentedViewController)];

    if ([@"ImgTakeViewController"isEqualToString:strSubClass]) {

        returnUIInterfaceOrientationMaskAll;

    }

    return [applicationsupportedInterfaceOrientationsForWindow:window];

}