在这里,主要为大家介绍一下,怎样从相册选取图片并在ImageView中显示出你选择的图片,并且实现简单的音乐和视频播放,下面是运行时的主页面效果图:
下面我们仔细学习具体的细节。创建一个空的IOS项目,接着在创建一个ViewController。
AppDelegate.h 应用的代理类这个没什么好说的就是直接打开刚刚创建的新ViewController,在ViewController.h文件里添加如下代码:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>
//注意这里面引入了很多代理类
@interface ViewController: UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate,AVAudioPlayerDelegate>
一.图片的选取
点击导航栏的photo按钮会跳转到photoView页面,至于如何跳转,下面介绍一种简单的跳转方式,则是在storyboard中右键点中photo拖拉到你要跳转的页面,在storyboard segues中有3个选项,Push,Modal和Custom,选中Modal,再次运行,点击photo页面跳转成功。
这时点击导航栏上的camera,会在下方弹出一个UIActionSheet,选择从手机相册获取之后回呈现相册里的图片,根据需求选择完之后会在ImageView中显示出来相应的图片,具体效果图如下:
在项目中添加类文件photoViewController系统自动生成photoViewController.h (头文件)和photoViewController.m(实现文件),在photoViewController.m中从相册选取图片的主要程序如下:
- (IBAction)btnPressed:(id)sender {
UIActionSheet*actionSheet = [[UIActionSheetalloc]
initWithTitle:nil
delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:nil
otherButtonTitles: @"打开照相机", @"从手机相册获取",nil];
[actionSheet showInView:self.view];
}
- (void)actionSheet:(UIActionSheet *)actionSheetclickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == actionSheet.cancelButtonIndex)
{
NSLog(@"取消");
}
switch (buttonIndex)
{
case 0:
//打开照相机拍照
[selftakePhoto];
break;
case 1:
//打开本地相册
[selfLocalPhoto];
break;
}
}
-(void)takePhoto
{
UIImagePickerController *picker=[[UIImagePickerControlleralloc]init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.delegate=self;
picker.allowsEditing=YES;
[selfpresentModalViewController:picker animated:YES];
}
-(void)LocalPhoto
{
UIImagePickerController *picker = [[UIImagePickerControlleralloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.delegate = self;
//设置选择后的图片可被编辑
picker.allowsEditing = YES;
[selfpresentModalViewController:picker animated:YES];
}
//实现图像选取器控制器的委托
-(void)p_w_picpathPickerController:(UIImagePickerController *)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info
{
//用UIImagePickerController选择、显示图片或视频
NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
//当选择的类型是图片
if ([type isEqualToString:@"public.p_w_picpath"])
{
//先把图片转成NSData
UIImage* p_w_picpath = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData *data;
//判断图片是不是JPEG格式的文件
if (UIImagePNGRepresentation(p_w_picpath))
{
data = UIImageJPEGRepresentation(p_w_picpath, 1.0);
}
else
{
data = UIImagePNGRepresentation(p_w_picpath);
}
//图片保存的路径
//指定文件目录这里将图片放在沙盒的documents文件夹中
NSString * documentsPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
//文件管理器
NSFileManager *fileManager = [NSFileManagerdefaultManager];
//把刚刚图片转换的data对象拷贝至沙盒中并保存为p_w_picpath.png
[fileManager createDirectoryAtPath: documentsPath withIntermediateDirectories:YESattributes:nilerror:nil];
[fileManager createFileAtPath:[ documentsPath stringByAppendingString:@"/p_w_picpath.png"] contents:data attributes:nil];
//得到选择后沙盒中图片的完整路径
filePath = [[NSStringalloc]initWithFormat:@"%@%@", documentsPath, @"/p_w_picpath.png"];
//关闭相册界面
[picker dismissModalViewControllerAnimated:YES];
p_w_picpathView.p_w_picpath = p_w_picpath;
//加在视图中
[self.viewaddSubview:p_w_picpathView];
}
}
二.音乐的播放:
音乐由页面中的PickVideo按钮触发播放音频文件,iPhone开发中想要实现音频的播放是很容易的,AVFoundation框架就是Apple本身推荐使用的一种方式。如何引入这个框架,下面为大家详细介绍:
首先,点击工程文件夹,会出现左边的界面,选择我圈起来的那个加号,会出现一系列的框架给你选择,你只需要选择AVFoundation.framework即可。此时,在它的上方就会显示出来,这个框架就添加好了。
播放音乐所需要的程序如下:
- (IBAction)playMp4File:(id)sender {
// //找到mp3在资源库中的路径文件名称为sound 类型为mp3
NSString *soundPath=[[NSBundlemainBundle] pathForResource:@"后来"ofType:@"mp3"];
if(soundPath)
{
NSURL *soundUrl=[[NSURLalloc] initFileURLWithPath:soundPath];
player=[[AVAudioPlayeralloc] initWithContentsOfURL:soundUrl error:nil];
//初始化播放器
[playerprepareToPlay];
//设置播放循环次数,如果numberOfLoops为负数音频文件就会一直循环播放下去
player.numberOfLoops = -1;
//设置音频音量 volume的取值范围在 0.0为最小 0.1为最大可以根据自己的情况而设置
player.volume = 0.5f;
}
//当player有值的情况下并且没有在播放中开始播放音乐
if (player)
{
if (![playerisPlaying])
{
[playerplay];
}
}
}
- (IBAction)palyStop:(id)sender {
//停止播放声音
if (player) {
if ([playerisPlaying]) {
[playerstop];
}
}
}
三.视频的播放:
视频的播放由页面中的play MP4 File ,play Stop触发,而且播放电影文件时需要注意:ios中可以使用MPMoviePlayerController来播放电影文件这个类定义在MediaPlayer.framework中。同理,添加MediaPlayer.framework框架。
下面是触发pivkVideo时的代码:
- (IBAction)pickVideo:(id)sender
{
NSString *videoPath=[[NSBundlemainBundle] pathForResource:@"犯罪高手" ofType:@"mp4"];
NSLog(@"%@",videoPath);
if(videoPath)
{
NSURL *videoUrl=[[NSURLalloc] initFileURLWithPath:videoPath];
//视频播放对象
moviePlayer = [[MPMoviePlayerControlleralloc]
initWithContentURL:videoUrl];
//适应屏幕大小,保持宽高比
moviePlayer.controlStyle=MPMovieScalingModeAspectFit;
[moviePlayer.viewsetFrame:self.view.bounds];
moviePlayer.initialPlaybackTime = -1;
//显示播放/暂停、音量和时间控制
moviePlayer.movieControlMode = MPMovieControlModeDefault;
[self.viewaddSubview:moviePlayer.view];
// 注册一个播放结束的通知
[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification
object:moviePlayer];
UIToolbar *toolBar=[[UIToolbaralloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
UIButton *button=[[UIButtonalloc] initWithFrame:CGRectMake(20, 3, 40, 40)];
[button setTitle:@"back"forState:UIControlStateNormal];
[button addTarget:selfaction:@selector(backItem) forControlEvents:UIControlEventTouchUpInside];
[toolBar addSubview:button];
[moviePlayer.viewaddSubview:toolBar];
[moviePlayerplay];
[moviePlayerstop];
}
}
-(void)myMovieFinishedCallback:(NSNotification*)notify
{
//视频播放对象
MPMoviePlayerController* theMovie = [notify object];
//销毁播放通知
[[NSNotificationCenterdefaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:theMovie];
[theMovie.viewremoveFromSuperview];
}
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