本文将带你了解IOS开发入门iOS视频播放横竖屏切换技巧，希望本文对大家学IOS有所帮助。

iOS视频播放横竖屏切换技巧。

一、需求：横竖屏切换。

二、效果：

三、实现：

如上图，点击工具栏的第四个按钮进行横屏切换：

-   (void)toolTabButtonPressed:(AKVideoToolTab1   *)sender{   

    if (sender.selectedIndex == 4) {//切换至全屏

        AppDelegate *appdelegate = (AppDelegate   *)[UIApplication sharedApplication].delegate;

        appdelegate.allowRotation =   YES;

        [[UIApplication sharedApplication]   setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];

NSNumber *orientationTarget = [NSNumber   numberWithInt:UIInterfaceOrientationLandscapeRight]; [[UIDevice   currentDevice] setValue:orientationTarget forKey:@"orientation"];

}}

假如在项目配置的时候整个项目是仅支持竖屏，所以在需要横屏的时候就需要通过代码进行控制：

appdelegate.allowRotation = YES;//允许横屏，当然退出本界面的时候要记得将其设为NO。

然后，设置横屏效果，才会生效：

NSNumber *orientationTarget = [NSNumber   numberWithInt:UIInterfaceOrientationLandscapeRight];

   [[UIDevice currentDevice] setValue:orientationTarget   forKey:@"orientation"];

至此，还没真正看得到横屏的效果，需对横屏变化进行监听，然后对UI进行变换。

四、横竖屏通知监听：
iOS横竖屏通知有两种，一种设备横竖屏状态变化，另一种状态栏横竖屏状态变化。与UI布局相关的是后者，因为如果一个viewController不支持自动旋转，并且相关view也没有进行横竖屏切换控制，而当设备由竖屏转横屏时依然会执行监听设备横竖屏的通知方法。以下对两种方式的简述：

1.监听设备横竖屏（UIDeviceOrientationDidChangeNotification）

[[NSNotificationCenter   defaultCenter] addObserver:self selector:@selector(orientChange:)   name:UIDeviceOrientationDidChangeNotification   object:nil];

4种状态：

UIDeviceOrientationPortrait

UIDeviceOrientationPortraitUpsideDown

UIDeviceOrientationLandscapeLeft

UIDeviceOrientationLandscapeRight

2.监听状态栏横竖屏状态（UIApplicationDidChangeStatusBarOrientationNotification）

[[NSNotificationCenter   defaultCenter] addObserver:self selector:@selector(orientChange:)   name:UIApplicationDidChangeStatusBarOrientationNotification   object:nil];

4种状态：

UIInterfaceOrientationUnknown   =   UIDeviceOrientationUnknown,

UIInterfaceOrientationPortrait   =   UIDeviceOrientationPortrait,

UIInterfaceOrientationPortraitUpsideDown   =   UIDeviceOrientationPortraitUpsideDown,

UIInterfaceOrientationLandscapeLeft   =   UIDeviceOrientationLandscapeRight,

UIInterfaceOrientationLandscapeRight   =   UIDeviceOrientationLandscapeLeft

要实现上图效果就要监听状态栏横竖屏状态：

#pragma mark ------------orientChangeNotification   监听横竖屏切换--------------

-   (void)orientChange:(NSNotification   *)notification{

    UIInterfaceOrientation interfaceOritation =   [[UIApplication sharedApplication]   statusBarOrientation];

    if (interfaceOritation == UIInterfaceOrientationLandscapeRight)   {

        videoView.frame =   CGRectMake(0 ,   0, kScreenWidth,   kScreenheight);

        self.navigationController.navigationBarHidden   = YES;

        CGFloat buttonW = 44;

        exitFullScreen =   ({

            UIButton *button = [UIButton   buttonWithType:UIButtonTypeCustom];

            button.frame =   CGRectMake(30,   10, buttonW,   buttonW);

            [button setImage:[UIImage   imageNamed:@"全屏播放-返回"]   forState:UIControlStateNormal];

            [button addTarget:self   action:@selector(exitFullScreen)   forControlEvents:UIControlEventTouchUpInside];

            button;

        });

        [self.view   addSubview:exitFullScreen];

    }else if(interfaceOritation ==   UIInterfaceOrientationPortrait){

        CGFloat  verticalH =   (kScreenWidth*0.6);

        videoView.frame =   CGRectMake(0,   60, kScreenWidth,   verticalH);

        self.navigationController.navigationBarHidden   = NO;

        [exitFullScreen   removeFromSuperview];

    }

}

当监听到是横屏UIInterfaceOrientationLandscapeRight的时候就进行横屏的UI布局。当是向竖屏UIInterfaceOrientationPortrait改变时进行竖屏的UI回归。效果如上。

ViewController的代码如下：

//

//    LHTViewController.m

//    CACloud

//

//    Created by Sure on 2017/8/24.

//    Copyright ? 2017年 Sure. All rights reserved.

//

#import "LHViewController.h"

#import "AKVideoToolTab1.h"

@interface LHViewController   ()<uigesturerecognizerdelegate,akvideotooltab1delegate>{

    UIImageView       *videoView;

    UIButton          *exitFullScreen;

}

@end

@implementation   LHViewController{

    AKVideoToolTab1   *akTab;

}

-   (void)viewDidLoad   {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor   whiteColor];

    [[NSNotificationCenter defaultCenter]   addObserver:self selector:@selector(orientChange:)   name:UIApplicationDidChangeStatusBarOrientationNotification   object:nil];

    [self addUI];

}

-   (void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:animated];

 }

-   (void)viewWillDisappear:(BOOL)animated{

    [super viewWillDisappear:animated];

    [[UIApplication sharedApplication]   setIdleTimerDisabled:NO] ;//关闭屏幕常亮；

    AppDelegate *appdelegate = (AppDelegate   *)[UIApplication sharedApplication].delegate;

    appdelegate.allowRotation =   NO;

    [[UIApplication sharedApplication]   setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

    NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];

    [[UIDevice currentDevice]   setValue:orientationTarget forKey:@"orientation"];

    [super viewWillDisappear:animated];

}

-   (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be   recreated.

}

- (void)addUI{

    CGFloat  verticalH =   (kScreenWidth*0.6);

    videoView = [[UIImageView alloc]   initWithFrame:CGRectMake(0,   60, kScreenWidth,   verticalH)];

    videoView.backgroundColor = [UIColor   blackColor];

    [self.view   addSubview:videoView];

    CGFloat toolH = 30;

    akTab = [[AKVideoToolTab1 alloc]   initWithFrame:CGRectMake(0,   CGRectGetMaxY(videoView.frame),   kScreenWidth,toolH)];

    [self.view   addSubview:akTab];

    CGFloat BtnW = 100;

    CGFloat gap = (kScreenWidth -   3*100)/4;

}

#pragma mark   ------------AKVideoToolTab1:播放、声音、清晰度、全屏--------------

- (void)toolTabButtonPressed:(AKVideoToolTab1   *)sender{

    if (sender.selectedIndex == 4) {//切换至全屏

        AppDelegate *appdelegate = (AppDelegate   *)[UIApplication sharedApplication].delegate;

        appdelegate.allowRotation = YES;

        [[UIApplication sharedApplication]   setStatusBarHidden:YES   withAnimation:UIStatusBarAnimationNone];

        NSNumber *orientationTarget = [NSNumber   numberWithInt:UIInterfaceOrientationLandscapeRight];

        [[UIDevice currentDevice] setValue:orientationTarget   forKey:@"orientation"];

    }

}

#pragma mark   ------------orientChangeNotification   监听横竖屏切换--------------

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