iOS视频播放横竖屏切换技巧

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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 (){
    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--------------
- (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];
    }
}



-(void)exitfullscreen{
    
    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"];
}

/*
#pragma mark - navigation

// in a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {
    // get the new view controller using [segue destinationviewcontroller].
    // pass the selected object to the new view controller.
}
*/

@end

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