整理iOS开发中使用的各种流媒体和常用的高级功能。由于时间关系，目前只写了一部分功能，全部都采用的是系统方法，没用第三方，截图如下：
screen1.png
screen2.png
个人比较懒，不爱多写文字，直接上代码，哈哈。
视频
系统用AVFoundation与MediaPlayer框架实现播放视频的方案。其中AVFoundation扩展性好，都需自定义功能，而MediaPlayer集成简单，但是样式不可扩展。
1.AVFoundation使用AVPlayer播放视频，它属于view的layer层。其功能都需要自定义，如音量、暂停、播放时长等。代码如下：
- (void)addAVPlayer
{
self.playerItem = [AVPlayerItem playerItemWithURL:self.movieURL];
self.player = [AVPlayer playerWithPlayerItem:self.playerItem];
AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:self.player];
layer.frame = CGRectMake(0, 70, kScreenWidth, 300);
layer.videoGravity = AVLayerVideoGravityResizeAspect;
layer.backgroundColor = [[UIColor blackColor] CGColor];
[self.view.layer addSublayer:layer];
[self.player play];
}
#pragma mark - Observer
//添加进度观察
- (void)addProgressObserver
{
// 设置每秒执行一次
__weak LXAVPlayVideoController *wSelf = self;
[self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue: NULL usingBlock:^(CMTime time) {
// NSLog(@"进度观察 + %f", wSelf.topProgressSlider.value);
// 获取当前时间
CMTime currentTime = wSelf.player.currentItem.currentTime;
// 转化成秒数
CGFloat currentPlayTime = (CGFloat)currentTime.value/currentTime.timescale;
// 总时间
CMTime totalTime = wSelf.playerItem.duration;
// 转化成秒
wSelf.totalMovieDuration = (CGFloat)totalTime.value/totalTime.timescale;
wSelf.topProgressSlider.value = currentPlayTime/wSelf.totalMovieDuration;
wSelf.progressValue = CMTimeGetSeconds(currentTime)/wSelf.totalMovieDuration;
wSelf.topPastTimeLabel.text = [LXHelpClass getTimeByProgress:currentPlayTime];
wSelf.topRemainderLabel.text = [LXHelpClass getTimeByProgress:wSelf.totalMovieDuration - currentPlayTime];
// NSLog(@"%f %f %f %f", wSelf.topProgressSlider.value, wSelf.totalMovieDuration, currentPlayTime, currentPlayTime/wSelf.totalMovieDuration);
}];
}
//播放结束后的代理回调
- (void)moviePlayDidEnd:(NSNotification *)notify
{
[self setMovieParse];
}
#pragma mark - Enent response
//播放进度
- (void)topSliderValueChangedAction:(UISlider *)sender
{
NSLog(@"进度条进度 + %f", sender.value);
double currentTime = floor(self.totalMovieDuration * sender.value);
//转换成CMTime才能给player来控制播放进度
CMTime dragedCMTime = CMTimeMake(currentTime, 1);
[self.player seekToTime:dragedCMTime completionHandler:^(BOOL finished) {
[self.player play];
}];
}
//音量slider
- (void)bottomSoundSliderAction:(UISlider *)sender
{
[self.player setVolume:sender.value];
self.bottomSoundSlider.value = sender.value;
if (sender.value == 0) {
NSLog(@"静音");
}
}
//播放暂停按钮
- (void)playBtnClicked:(UIButton *)sender
{
if (isPlay) {
[self setMovieParse];
} else {
[self setMoviePlay];
}
isPlay ^= 1;
}
#pragma mark - Private methods
- (void)addNotificationCenters
{
// 注册观察者用来观察，是否播放完毕
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayDidEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
}
- (void)setMovieParse
{
[self.player pause];
}
- (void)setMoviePlay
{
[self.player play];
}
2.MediaPlayer框架提供MPMoviePlayerController与MPMoviePlayerViewController播放视频，它们区别就是MPMoviePlayerViewController里面包含了一个MPMoviePlayerController，另外MPMoviePlayerViewController可以看作是一个控制器播放视频的。系统已经为之集成好了音量、播放暂停等功能。
- MPMoviePlayerController的使用
- (void)addMPMoviePlayer
{
MPMoviePlayerController *mpPlayer = [[MPMoviePlayerController alloc] init];
mpPlayer.view.frame = CGRectMake(0, 20, kScreenWidth, kScreenWidth/videoSizeRate);
mpPlayer.backgroundView.backgroundColor = [UIColor blackColor];
mpPlayer.scalingMode = MPMovieScalingModeAspectFill;
[self.view addSubview:mpPlayer.view];
self.mpPlayer = mpPlayer;
}
#pragma mark - Observer
- (void)enterFullscreen:(NSNotification *)noti
{
[self fullScreen:YES];
[LXHelpClass setDeviceLandscape:direction];
}
- (void)exitFullscreen:(NSNotification *)noti
{
[self fullScreen:NO];
UIDeviceOrientation orient = [UIDevice currentDevice].orientation;
if (orient != UIDeviceOrientationPortrait) {
direction = UIDeviceOrientationPortrait;
[LXHelpClass setDeviceLandscape:direction];
}
direction = UIDeviceOrientationLandscapeLeft;
}
- (void)loadCompletion:(NSNotification *)noti
{
[self.videoLoading stopAnimating];
}
- (void)orientChange:(NSNotification *)noti
{
UIDeviceOrientation orient = [UIDevice currentDevice].orientation;
switch (orient)
{
case UIDeviceOrientationPortrait:
self.mpPlayer.fullscreen = NO;
break;
case UIDeviceOrientationLandscapeLeft:
direction = UIDeviceOrientationLandscapeLeft;
self.mpPlayer.fullscreen = YES;
break;
case UIDeviceOrientationPortraitUpsideDown:
self.mpPlayer.fullscreen = NO;
break;
case UIDeviceOrientationLandscapeRight:
direction = UIDeviceOrientationLandscapeRight;
self.mpPlayer.fullscreen = YES;
break;
default: break;
}
}
- (void)mediaPlayerPlaybackStateChange:(NSNotification *)notification
{
switch (self.mpPlayer.playbackState) {
case MPMoviePlaybackStatePlaying:
NSLog(@"正在播放...");
break;
case MPMoviePlaybackStatePaused:
NSLog(@"暂停播放.");//注意播放完成时的状态是暂停
break;
case MPMoviePlaybackStateStopped:
NSLog(@"停止播放.");
break;
default:
NSLog(@"播放状态:%li",self.mpPlayer.playbackState);
break;
}
}
- (void)mediaPlayerThumbnailRequestFinished:(NSNotification *)notification
{
NSLog(@"视频截图完成.");
UIImage *image=notification.userInfo[MPMoviePlayerThumbnailImageKey];
//保存图片到相册(首次调用会请求用户获得访问相册权限)
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
- MPMoviePlayerViewController的使用
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = bgColor;
MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc] initWithContentURL:self.mp4URL];
player.view.frame = CGRectMake(0, 0, kScreenWidth, 300);
[self.view addSubview:player.view];
self.player = player;
UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake((kScreenWidth-100)/2.0, kScreenHeight - 64 - 100, 100, 50);
[button setTitle:@"全屏播放" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)buttonClick
{
[self presentMoviePlayerViewControllerAnimated:self.player];
}
音频
系统也提供灵活性很强的AVAudioPlayer和集成快的MPMusicPlayerController播放音乐。
具体功能实现请查看源码，这里不做过多介绍。
健康
这方面的资料比较少，只好查看官方文档。这里我只写了获取步数这个常用功能。HealthKit框架提供了许多获取健康数据的API。
LXHealthKitManager *myHealth = [LXHealthKitManager sharedLXHealthKitManager];
myHealth.startDate = [LXHealthKitManager getTodayAgoWithDays:30];//获取今天之前三十天的步数
[myHealth getStepCountWithSuccess:^(NSArray *results) {
[self.modelArr setArray:results];
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
} withfailure:^(NSError *error) {
NSLog(@"error:%@", error);
}];
LXHealthKitManager的代码如下：
- (instancetype)init
{
self = [super init];
if (self) {
[self setup];
}
return self;
}
- (void)setup
{
if ([HKHealthStore isHealthDataAvailable]) {
NSLog(@"此设备能使用健康数据");
HKHealthStore *healthStore = [[HKHealthStore alloc] init];
[healthStore requestAuthorizationToShareTypes:[self shareTypes] readTypes:[self readTypes] completion:^(BOOL success, NSError *error) {
if (success == YES) {
NSLog(@"授权成功");
} else {
NSLog(@"授权失败");
}
}];
self.healthStore = healthStore;
} else {
NSLog(@"此设备不能使用健康数据");
}
}
- (void)getStepCountWithSuccess:(void (^)(NSArray *))success withfailure:(void (^)(NSError *))failure
{
HKQuantityType *quantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];
NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:self.startDate endDate:self.endDate options:HKQueryOptionStrictEndDate];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.day = 1;
HKStatisticsCollectionQuery *collectionQuery = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:quantityType quantitySamplePredicate:predicate options:HKStatisticsOptionCumulativeSum | HKStatisticsOptionSeparateBySource anchorDate:self.startDate intervalComponents:dateComponents];
collectionQuery.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection * __nullable result, NSError * __nullable error) {
NSMutableArray *returnArr = [NSMutableArray array];
for (NSInteger i = result.statistics.count - 1; i >= 0; i--) {
HKStatistics *statistic = result.statistics[i];
for (HKSource *source in statistic.sources) {
if ([source.name isEqualToString:[UIDevice currentDevice].name]) {
LXHealthStepModel *model = [[LXHealthStepModel alloc] init];
model.startDateStr = [self changeToDateStrWithDate:statistic.startDate];
model.endDateStr = [self changeToDateStrWithDate:statistic.endDate];
HKQuantity *quantity = [statistic sumQuantityForSource:source];
if ([quantity isCompatibleWithUnit:[HKUnit countUnit]]) {
model.stepCount = (NSInteger)[quantity doubleValueForUnit:[HKUnit countUnit]];
}
[returnArr addObject:model];
}
}
}
if (!error) {
if (success) {
success(returnArr);
}
} else if (failure) {
failure(error);
}
};
[self.healthStore executeQuery:collectionQuery];
}
源码请点击github地址下载。
QQ:2239344645 我的github
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