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#import "RootViewController.h"
//此framework中带有系统预置的多媒体常量参数
#import <MobileCoreServices/MobileCoreServices.h>
#import "ImageTool.h"//对图片进行压缩处理的工具类
#import <MediaPlayer/MediaPlayer.h>//此framework中带有视频播放器
@interface RootViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate,AVAudioPlayerDelegate>
{
AVAudioPlayer *_audioPlayer;//音频播放器
//带有视频播放器的控制器(能够播放mp4、avi、mov格式的视频,支持本地和远程视频的播放)
MPMoviePlayerViewController*_playController;
}
@end
@implementation RootViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *titles = [NSArray arrayWithObjects:@"拍照",@"相册库",@"音频",@"视频",nil];
for (int i = 0; i<titles.count; i++) {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:[titles objectAtIndex:i] forState:UIControlStateNormal];
[btn setFrame:CGRectMake(10,70+i*60,300,50)];
[btn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
btn.tag = 100+i;
[self.view addSubview:btn];
}
}
#pragma mark - customMethods
- (void)btnClicked:(UIButton *)btn{
switch (btn.tag) {
case 100:
{
//拍照功能
//先判断硬件是否支持拍照功能
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
[self loadImagePickerWithSourceType:UIImagePickerControllerSourceTypeCamera];
}else{
//提示用户
[self showAlertViewWithMessage:@"不支持拍照功能"];
}
}break;
case 101:
{
//调用系统相册库
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
[self loadImagePickerWithSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}else {
[self showAlertViewWithMessage:@"无法获取相册库"];
}
}break;
case 102:
{
//音频
NSString *audioPath = [[NSBundle mainBundle] pathForResource:@"song1" ofType:@"mp3"];
//播音频
[self playAudioWithPath:audioPath];
//[self haha];
}break;
case 103:
{
NSString *videoPath = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp4"];
[self playVideoWithPath:videoPath];
//[self hahahaha];
}break;
default:
break;
}
}
//根据不同的资源参数加载不同的资源（拍照、相册库）
- (void)loadImagePickerWithSourceType:(UIImagePickerControllerSourceType)type{
//UIImagePickerController
//通过UIImagePickerController 来获取拍照和相册库资源
UIImagePickerController *picker = [[[UIImagePickerController alloc] init] autorelease];
//根据不同的参数加载不同的资源
picker.sourceType = type;
//设置代理
picker.delegate = self;
//是否允许对图片、视频资源进行后续处理
picker.allowsEditing = YES;
//一般情况下picker 习惯通过模态化的方式呈现到程序中
[self presentViewController:picker animated:YES completion:^{
}];
}
//根据不同的提示信息来创建警告框,用于提升用户体验
- (void)showAlertViewWithMessage:(NSString *)info{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:info delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
//将警告框呈现到应用程序
[alert show];
[alert release];
}
//根据音频的资源路径来播放音频
- (void)playAudioWithPath:(NSString *)audioPath{
if (audioPath.length == 0) {
NSLog(@"没有音频资源!");
return;
}
//如果有旧的播放器对象，销毁
if (_audioPlayer) {
[_audioPlayer release];
_audioPlayer = nil;
}
//创建新的播放器对象
//本地的资源路径生成url用fileURLWithPath
NSURL *url = [NSURL fileURLWithPath:audioPath];
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
//设置代理
_audioPlayer.delegate = self;
//对音频资源进行预加载
[_audioPlayer prepareToPlay];
//播放音频
[_audioPlayer play];
//[_audioPlayer stop];
}
//播视频
- (void)playVideoWithPath:(NSString *)videoPath{
if (videoPath.length == 0) {
NSLog(@"没有视频资源!");
return;
}
//可以播放本地和远程视频
NSURL *url;
if ([videoPath rangeOfString:@"http://"].location !=NSNotFound || [videoPath rangeOfString:@"https://"].location!=NSNotFound) {
url=[NSURL URLWithString:videoPath];
}else{
//本地资源路径
url = [NSURL fileURLWithPath:videoPath];
}
if (!_playController) {
//创建一个带有视频播放器的控制器
_playController = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
_playController.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
//通过模态化的方式呈现
[self presentViewController:_playController animated:YES completion:^{
//停掉音频播放器
[self stopAudioPlayer];
}];
//视频资源分为普通的文件资源,还有流媒体格式(.m3u8)的视频资源
//moviePlayer属性为视频播放器,指定播放的资源的类型
//播放视频
[_playController.moviePlayer play];
//通过点击done按钮后，销毁_playController
//每个应用程序有且只有一个通知中心的对象(单例),可以理解为广播站，任何对象都可以通过通知中心发送广播
//任何对象都可以通过通知中心注册成为某条广播的观察者(具有接收/收听某条广播能力的对象)
//在通知中心注册self为MPMoviePlayerPlaybackDidFinishNotification广播的观察者，一旦有其他对象发送这条广播，self就能接收到并触发playBack方法
//addObserver 添加观察者, selector 触发的方法,name:广播的名称
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playBack) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
//点击done按钮->视频播放器会自动通过通知中心发送MPMoviePlayerPlaybackDidFinishNotification这条广播
//[[NSNotificationCenter defaultCenter] postNotificationName:MPMoviePlayerPlaybackDidFinishNotification object:nil];
}
}
- (void)playBack{
//在通知中心移除self对MPMoviePlayerPlaybackDidFinishNotification广播的观察
[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
if (_playController) {
//停掉播放器
[_playController.moviePlayer stop];
//销毁playController
[_playController release];
_playController = nil;
}
}
//停掉音频播放器，并销毁
- (void)stopAudioPlayer{
if (_audioPlayer) {
[_audioPlayer stop];
[_audioPlayer release];
_audioPlayer = nil;
}
}
#pragma mark - UIImagePickerControllerDelegate
//点击picker上的cancel按钮时，触发的方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
NSLog(@"cancel!!");
//实现picker的dismiss
[picker dismissViewControllerAnimated:YES completion:^{
}];
}
//点击choose按钮触发的方法
//info 带有选中资源的信息
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
//判断选中的资源的类型
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
//kUTTypeImage 系统预置的图片资源类型
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
//证明取出来的是图片
//通过字典获取选中的图片
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
//从相机中取出来的图片占的空间:(1M-2M)左右,需要对图片进行压缩处理,然后在进行后续操作
//将原图压缩成50*50的尺寸
UIImage *smallImage = [[ImageTool shareTool] resizeImageToSize:CGSizeMake(50,50) sizeOfImage:image];
self.view.backgroundColor = [UIColor colorWithPatternImage:smallImage];
}
[picker dismissViewControllerAnimated:YES completion:^{
}];
}
#pragma mark - AVAudioPlayerDelegate
//当成功播放完成一首歌后，调用此方法
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
NSLog(@"successFully!!");
}
//当系统级别的功能介入（来电话了)，播放器被打断时，调用此方法
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)player{
NSLog(@"beginInterruption!");
}
//当播放器结束被打断，调用此方法
- (void)audioPlayerEndInterruption:(AVAudioPlayer *)player withOptions:(NSUInteger)flags{
if (player) {
//继续播放
[player play];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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原文地址：http://www.cnblogs.com/liaods/p/4788631.html
