多媒体之调用相机相册及视频播放

#import "RootViewController.h"
#import <MediaPlayer/MediaPlayer.h>
#import <MobileCoreServices/MobileCoreServices.h> //存放了系统调用的常量
@interface RootViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self createUI];
}
-(void)createUI{
    NSMutableArray *titleAry=[[NSMutableArray alloc] initWithObjects:@"拍照",@"相册",@"视频", nil];
    for (int i=0; i<titleAry.count; i++) {
        UIButton *btn=[[UIButton alloc] initWithFrame:CGRectMake(100, 100+i*100, 200, 50)];
        btn.backgroundColor=[UIColor blackColor];
        [btn setTitle:titleAry[i] forState:UIControlStateNormal];
        btn.tag=1+i;
        [btn addTarget:self action:@selector(btn_Click:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
    }
    
    UIImageView *iv=[[UIImageView alloc] initWithFrame:CGRectMake(100, 400, 200, 200)];
    iv.tag=100;
    [self.view addSubview:iv ];
    
}

-(void)btn_Click:(UIButton *)sender{
    NSInteger i=sender.tag;
    switch (i) {
        case 1:
            //实现拍照
            if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
                //相机可用
                [self loadImagePickerWithType:UIImagePickerControllerSourceTypeCamera];
            }else{
                NSLog(@"拍照功能不可用");
            }
            break;
        case 2:{
            //实现相册
            if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
                //相册可用
                [self loadImagePickerWithType:UIImagePickerControllerSourceTypePhotoLibrary];
            }else{
                NSLog(@"不能获取系统相册");
            }
        }
            break;
        case 3:{
            //实现视频播放
            NSString *strPath=[[NSBundle mainBundle ] pathForResource:@"1" ofType:@".mp4"];
            [self  playVedio:strPath];
        }
            break;
        default:
            //
            break;
    }
}
//拍照及相册功能调用的函数(UIImagePickerControllerSourceType是枚举不是类不要*)
-(void)loadImagePickerWithType:(UIImagePickerControllerSourceType)type{
    UIImagePickerController *ipc=[[UIImagePickerController alloc] init];
    ipc.sourceType=type;
    ipc.delegate=self;
    //如果是相册功能，设置允许编辑图片
    ipc.allowsEditing=YES;
    [self presentViewController:ipc animated:NO completion:nil];
}
-(void)playVedio:(NSString *)path{
    //实现视频文件的播放
    if (path.length==0) {
        NSLog(@"请输入有效的文件路径");
        return;
    }
    //判断文件是本地文件还是远程文件
    NSURL *URL;
    if ([path rangeOfString:@"http://"].location!=NSNotFound || [path rangeOfString:@"http:"].location!=NSNotFound) {
        //本地文件
        URL=[NSURL URLWithString:path];
    }else{
        
        URL=[NSURL fileURLWithPath:path];
    }
    //创建视频播放对象
    MPMoviePlayerViewController *mpvc=[[MPMoviePlayerViewController alloc] initWithContentURL:URL];
    //设置播放类型
    mpvc.moviePlayer.movieSourceType=MPMovieSourceTypeFile;
    //显示播放窗口
    [self presentViewController:mpvc animated:NO completion:nil];
    //播放文件
    [[mpvc moviePlayer] play];
}
#pragma mark - 实现拍照及相册功能的协议函数
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [picker dismissViewControllerAnimated:NO completion:nil];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    //在此函数里获取通过相册选择的图片
    NSString *type=info[UIImagePickerControllerMediaType];
    //需要引入一个系统的常量类，定义了各种常量
    if ([type isEqualToString:(NSString *)kUTTypeImage]) {
        //获取图片，对图片进行处理
        UIImage *image=info[UIImagePickerControllerEditedImage];
        UIImageView *iv=(UIImageView *)[self.view viewWithTag:100];
        iv.image=image;
    }
    [picker dismissViewControllerAnimated:NO completion:nil];
}