[iOS 相机相册调用] UIImagePickerController 简单实用 [转]

在ios中要拍照和录制视频最简单的方式就是调用uiimagepickercontroller，uiimagepickercontroller继承与uinavigationcontroller，需要使用代理方法时需要同时遵守这两个协议，以前可能比较多的是使用uiimagepickercontroller来选择相册图片或者拍摄图片，其实它的功能还能用来拍摄视频。

使用uiimagepickercontroller拍照或者拍视频主要以下几个步骤：
创建一个全局的uiimagepickercontroller对象。
指定uiimagepickercontroller的来源sourcetype，是来自uiimagepickercontrollersourcetypecamera相机，还是来自uiimagepickercontrollersourcetypephotolibrary相册。

然后是设置mediatypes媒体类型，这是录制视频必须设置的选项，默认情况下是kuttypeimage（注意：mediatypes的设置是在mobilecoreservices框架下），同还可以设置一些其他视频相关的属性，例如：videoquality视频的质量、videomaximumduration视频的最大录制时长（默认为10s），cameradevice摄像头的方向（默认为后置相机）。

指定相机的捕获模式cameracapturemode，设置mediatypes后在设置捕获模式，注意的是捕获模式需要在相机来源sourcetype为相机时设置，否则会出现crash。

适时的展示uiimagepickercontroller，然后在相应的代理方法保存和获取图片或视频。

下面还是上代码吧，更加清晰明了…
首先需要导入以下用到的几个头文件，同时遵守两个代理方法

#import "viewcontroller.h"
#import 
#import 
#import 
@interface viewcontroller ()
{
    uiimagepickercontroller *_imagepickercontroller;
}

创建uiimagepickercontroller对象

- (void)viewdidload {
    [super viewdidload];
    // do any additional setup after loading the view, typically from a nib

    _imagepickercontroller = [[uiimagepickercontroller alloc] init];
    _imagepickercontroller.delegate = self;
    _imagepickercontroller.modaltransitionstyle = uimodaltransitionstylefliphorizontal;
    _imagepickercontroller.allowsediting = yes;

从摄像头获取图片或视频

#pragma mark 从摄像头获取图片或视频
- (void)selectimagefromcamera
{
    _imagepickercontroller.sourcetype = uiimagepickercontrollersourcetypecamera;
    //录制视频时长，默认10s
    _imagepickercontroller.videomaximumduration = 15;

    //相机类型（拍照、录像...）字符串需要做相应的类型转换
    _imagepickercontroller.mediatypes = @[(nsstring *)kuttypemovie,(nsstring *)kuttypeimage];

    //视频上传质量
    //uiimagepickercontrollerqualitytypehigh高清
    //uiimagepickercontrollerqualitytypemedium中等质量
    //uiimagepickercontrollerqualitytypelow低质量
    //uiimagepickercontrollerqualitytype640x480
    _imagepickercontroller.videoquality = uiimagepickercontrollerqualitytypehigh;

    //设置摄像头模式（拍照，录制视频）为录像模式
    _imagepickercontroller.cameracapturemode = uiimagepickercontrollercameracapturemodevideo;
    [self presentviewcontroller:_imagepickercontroller animated:yes completion:nil];
}

从相册获取图片或视频

#pragma mark 从相册获取图片或视频
- (void)selectimagefromalbum
{
    //nslog(@"相册");
    _imagepickercontroller.sourcetype = uiimagepickercontrollersourcetypephotolibrary;

    [self presentviewcontroller:_imagepickercontroller animated:yes completion:nil];
}

在imagepickercontroller:didfinishpickingmediawithinfo:代理方法中处理得到的资源，保存本地并上传…

#pragma mark uiimagepickercontrollerdelegate
//该代理方法仅适用于只选取图片时
- (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingimage:(uiimage *)image editinginfo:(nullable nsdictionary *)editinginfo {
    nslog(@"选择完毕----image:%@-----info:%@",image,editinginfo);
}

//适用获取所有媒体资源，只需判断资源类型
- (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info{
    nsstring *mediatype=[info objectforkey:uiimagepickercontrollermediatype];
    //判断资源类型
    if ([mediatype isequaltostring:(nsstring *)kuttypeimage]){
        //如果是图片
        self.imageview.image = info[uiimagepickercontrollereditedimage];
        //压缩图片
        nsdata *filedata = uiimagejpegrepresentation(self.imageview.image, 1.0);
        //保存图片至相册
        uiimagewritetosavedphotosalbum(self.imageview.image, self, @selector(image:didfinishsavingwitherror:contextinfo:), null);
        //上传图片
        [self uploadimagewithdata:filedata];

    }else{
        //如果是视频
        nsurl *url = info[uiimagepickercontrollermediaurl];
        //播放视频
        _movieplayer.contenturl = url;
        [_movieplayer play];
        //保存视频至相册（异步线程）
        nsstring *urlstr = [url path];

        dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{
            if (uivideoatpathiscompatiblewithsavedphotosalbum(urlstr)) {

                uisavevideoatpathtosavedphotosalbum(urlstr, self, @selector(video:didfinishsavingwitherror:contextinfo:), nil);
            }
        });
        nsdata *videodata = [nsdata datawithcontentsofurl:url];
        //视频上传
        [self uploadvideowithdata:videodata];
    }
    [self dismissviewcontrolleranimated:yes completion:nil];
}

图片和视频保存完毕后的回调

#pragma mark 图片保存完毕的回调
- (void) image: (uiimage *) image didfinishsavingwitherror:(nserror *) error contextinfo: (void *)contextinf{

}

#pragma mark 视频保存完毕的回调
- (void)video:(nsstring *)videopath didfinishsavingwitherror:(nserror *)error contextinfo:(void *)contextinf{
    if (error) {
        nslog(@"保存视频过程中发生错误，错误信息:%@",error.localizeddescription);
    }else{
        nslog(@"视频保存成功.");
    }
}

以上仅是简单功能的实现，还有例如切换前后摄像头、闪光灯设置、对焦、曝光模式等更多功能…

---

以下为自己的应用 仅供自己翻阅

//
//  complaintviewcontroller.m
//  quickpos
//
//  created by lff on 16/8/1.
//  copyright ? 2016年 张倡榕. all rights reserved.
//

#import "complaintviewcontroller.h"
#import 
#import 
#import 
@interface complaintviewcontroller ()
{

    nsmutablearray  *_dataarray;
    request *_rep;
    uiimagepickercontroller *_imagepickercontroller;
}
@property (weak, nonatomic) iboutlet uiview *bgview1;//模块1
@property (weak, nonatomic) iboutlet uiview *bgview2;
@property (weak, nonatomic) iboutlet uiview *bgview3;


@property (weak, nonatomic) iboutlet uitextfield *nameproduct;
@property (weak, nonatomic) iboutlet uitextfield *sizeproduct;
@property (weak, nonatomic) iboutlet uitextfield *dateproduct;
@property (weak, nonatomic) iboutlet uitextfield *username;
@property (weak, nonatomic) iboutlet uitextfield *mobile;
@property (weak, nonatomic) iboutlet uitextfield *email;
@property (weak, nonatomic) iboutlet uitextfield *address;
@property (weak, nonatomic) iboutlet uilabel *photolab;
@property (weak, nonatomic) iboutlet uiimageview *photoimageshoew;

@end

@implementation complaintviewcontroller
- (void)viewdidappear:(bool)animated{
    [super viewdidappear:animated];

    self.navigationcontroller.navigationbar.x = 0;

}

- (void)viewdidload {
    [super viewdidload];
    // do any additional setup after loading the view from its nib.
    self.title = @"投诉建议";
    self.view.backgroundcolor = [common hexstringtocolor:@"eeeeee"];
    _rep = [[request alloc] initwithdelegate:self];

    [self setimagepickercontroller];
}

- (void)didreceivememorywarning {
    [super didreceivememorywarning];
    // dispose of any resources that can be recreated.
}
- (void)setimagepickercontroller{
    _imagepickercontroller = [[uiimagepickercontroller alloc] init];
    _imagepickercontroller.delegate  = self;
    _imagepickercontroller.allowsediting = yes;
    _imagepickercontroller.modaltransitionstyle = uimodaltransitionstylefliphorizontal;

}

//相机/相册
- (ibaction)cameragetbtn:(id)sender {

    [common pstaalertwithtitle:@"提示" message:@"请选择图片来源方式" defaulttitle:@"相册" cancletitle:@"相机" defaultblock:^(id defaultblock) {
        _imagepickercontroller.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
        [self presentviewcontroller:_imagepickercontroller animated:yes completion:nil];

    } cancleblock:^(id cancleblock) {
        _imagepickercontroller.sourcetype = uiimagepickercontrollersourcetypecamera;
        _imagepickercontroller.videomaximumduration = 10;
        _imagepickercontroller.mediatypes = @[(nsstring*)kuttypemovie,(nsstring*)kuttypeimage];
        _imagepickercontroller.videoquality = uiimagepickercontrollerqualitytypelow;
        _imagepickercontroller.cameracapturemode = uiimagepickercontrollercameracapturemodephoto;
        [self presentviewcontroller:_imagepickercontroller animated:yes completion:nil];

           } ctr:self];

}

#pragma  mark - imagepickercontrollerdelegate
//适用获取所有媒体资源，只需判断资源类型
-(void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info{

    nsstring *mdeiatye = [info objectforkey:uiimagepickercontrollermediatype]; //获取媒体类型
    if ([mdeiatye isequaltostring:(nsstring*)kuttypeimage]) {  //判断媒体类型是图片
        uiimage *image = info[uiimagepickercontrollereditedimage];
        nsdata *data = uiimagejpegrepresentation(image, 1.0);
        nsstring *iamgestrbase64 = [data base64encoding];
        nslog(@"%@,%lu",iamgestrbase64,iamgestrbase64.length/1024);

        _photolab.text = @"照片已选择";
        _photoimageshoew.image = image;


    }
    [self dismissviewcontrolleranimated:yes completion:nil];
}

//提交
- (ibaction)updatebtn:(id)sender {
    [_rep postcomplaintwithtagid:@"f1060f560c2002e0" tagsn:@"000000000777" tagsnproducercode:@"shfda" enterpriseid:@"3" productid:@"47" username:@"inesa芥花油" mobile:@"15151474388" comments:@"123"];

    [common pstaalertwithtitle:@"" message:@"已提交" defaulttitle:@"留在本页" cancletitle:@"返回主页" defaultblock:^(id defaultblock) {
        nslog(@"123");

    } cancleblock:^(id cancleblock) {
        [self.navigationcontroller poptorootviewcontrolleranimated:yes];
    } ctr:self];



}
-(void)responsewithdict:(nsdictionary *)dict requesttype:(nsinteger)type{
    if (type == requset_complaint) {


    }
}

- (void)viewdiddisappear:(bool)animated{
    [super viewdiddisappear:animated];

//    _photoimageshoew.ima



}

/*
#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