我有一个带标签页脚功能的在线广播播放器。第一个选项卡包含播放器，第二个是网站，第三个是消息框。现在发生的事情是，当我在第一个页脚播放歌曲，然后转到另一个页脚，然后回到第一个页脚时，这首歌又开始了。这是代码：
FirstViewController.m
#import "FirstViewController.h"
CM_EXPORT const CMTime kCMTimeZero;
@interface FirstViewController ()
@end
@implementation FirstViewController
@synthesize metadatas;
@synthesize toggleButton;
@synthesize slider;
@synthesize mpVolumeView = _mpVolumeView;
@synthesize viewVolume;
- (void)viewDidLoad
{
toggleIsOn=TRUE;
MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:self.viewVolume.bounds] ;
[self.viewVolume addSubview:volumeView];
[volumeView sizeToFit];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
-(IBAction)playButtonPressed:(id)sender
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:TRUE forKey:@"FirstPlay"];
[defaults setBool:YES forKey:@"alertShown"];
if(toggleIsOn){
toggleIsOn=!toggleIsOn;
player = nil;
NSString *stringurl = @"";
stringurl = @"http://majestic.wavestreamer.com:6221/listen.pls";
NSURL *url = [NSURL URLWithString:stringurl];
asset = [AVURLAsset URLAssetWithURL:url options:nil];
playerItem = [AVPlayerItem playerItemWithAsset:asset];
player = [AVPlayer playerWithPlayerItem:playerItem];
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
[playerItem addObserver:self forKeyPath:@"timedMetadata" options:NSKeyValueObservingOptionNew context:nil];
[playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
[player play];
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(audioSessionInterrupted:) name:AVAudioSessionInterruptionNotification object:nil];
[self.toggleButton setImage:[UIImage imageNamed:@"reload.png"] forState:UIControlStateNormal];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
else {
[self.toggleButton setImage:[UIImage imageNamed:@"playMusic.png"] forState:UIControlStateNormal];
self->player.rate=0.0;
toggleIsOn=!toggleIsOn;
}
}
- (void)audioSessionInterrupted:(NSNotification *)notification
{
NSNumber *interruptionType = [[notification userInfo] objectForKey:AVAudioSessionInterruptionTypeKey];
NSNumber *interruptionOption = [[notification userInfo] objectForKey:AVAudioSessionInterruptionOptionKey];
switch (interruptionType.unsignedIntegerValue) {
case AVAudioSessionInterruptionTypeBegan:{
// [self.toggleButton setImage:[UIImage imageNamed:@"playMusic.png"] forState:UIControlStateNormal];
// • Audio has stopped, already inactive
// • Change state of UI, etc., to reflect non-playing state
} break;
case AVAudioSessionInterruptionTypeEnded:{
// • Make session active
// • Update user interface
// • AVAudioSessionInterruptionOptionShouldResume option
if (interruptionOption.unsignedIntegerValue == AVAudioSessionInterruptionOptionShouldResume) {
// Here you should continue playback.
[player play];
}
} break;
default:
break;
}
}
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)audioPlayer
{
[player pause];
}
-(void)audioRecorderEndInterruption:(AVAudioRecorder *)audioPlayer
{
[player play];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:TRUE forKey:@"alertShown"];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];
internetReachable = [Reachability reachabilityForInternetConnection];
[internetReachable startNotifier];
// check if a pathway to a random host exists
hostReachable = [Reachability reachabilityWithHostName:@"www.apple.com"];
[hostReachable startNotifier];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context {
[playerItem removeObserver:self forKeyPath:keyPath];
if ([keyPath isEqualToString:@"status"]) {
AVPlayerItem *pItem = (AVPlayerItem *)object;
if (pItem.status == AVPlayerItemStatusReadyToPlay)
{
metadatas.text = @"";
}
}
if ([keyPath isEqualToString:@"timedMetadata"]) {
for (AVAssetTrack *track in playerItem.tracks) {
for (AVPlayerItemTrack *item in player.currentItem.tracks) {
if ([item.assetTrack.mediaType isEqual:AVMediaTypeAudio]) {
NSArray *meta = [playerItem timedMetadata];
for (AVMetadataItem *metaItem in meta) {
NSString *source = metaItem.stringValue;
metadatas.text = source;
}
}
}
}
}
[self.toggleButton setImage:[UIImage imageNamed:toggleIsOn ? @"playMusic.png" :@"stop.png"] forState:UIControlStateNormal];
}
-(IBAction) sliderChanged:(id)sender
{
player.volume = slider.value;
}
-(void) checkNetworkStatus:(NSNotification *)notice
{
// called after network status changes
NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
switch (internetStatus)
{
case NotReachable:
{
NSLog(@"The internet is down.");
NSLog(@"%d",[defaults boolForKey:@"alertShown"]);
BOOL isAlertShown = [defaults boolForKey:@"alertShown"];
if(isAlertShown)
{
[self showAlert];
}
break;
}
case ReachableViaWiFi:
{
NSLog(@"The internet is working via WIFI.");
BOOL isFirstTimePlayed = [defaults boolForKey:@"FirstPlay"];
if(isFirstTimePlayed)
{
[self playButtonPressed:nil];
}
break;
}
case ReachableViaWWAN:
{
NSLog(@"The internet is working via WWAN.");
[self playButtonPressed:nil];
break;
}
}
}
-(void)showAlert
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:FALSE forKey:@"alertShown"];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Alert" message: @"You have lost data connectivity. Please wait while we try to establish the connection again." delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
- (NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}
@end
SecondViewController.m
#import "SecondViewController.h"
#import "MBProgressHUD.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
webView = [[UIWebView alloc] init];
[webView setFrame:self.view.frame];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.radiomalayalam.net"]]];
[self.view addSubview:webView];
CGSize contentSize = webView.scrollView.contentSize;
CGSize viewSize = self.view.bounds.size;
float rw = viewSize.width / contentSize.width;
webView.scrollView.minimumZoomScale = rw;
webView.scrollView.maximumZoomScale = rw;
webView.scrollView.zoomScale = rw;
webView.scalesPageToFit = YES;
[webView setDelegate:self];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = @"Loading";
// you can implement any int/float value in context of what scale you want to zoom in or out
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
NSLog(@"Pinch scale: %f", recognizer.scale);
CGAffineTransform transform = CGAffineTransformMakeScale(recognizer.scale, recognizer.scale);
// you can implement any int/float value in context of what scale you want to zoom in or out
webView.transform = transform;
}
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
[MBProgressHUD hideHUDForView:self.view animated:YES];
}
- (NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}
@end
ThirdViewController.m
#import "ThirdViewController.h"
@interface ThirdViewController ()
@end
@implementation ThirdViewController
@synthesize mBodyText,mSubjectLabel;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
[mBodyText setDelegate:self ];
[mSubjectLabel setDelegate:self];
}
return self;
}
- (IBAction)hidekeyBoard:(id)sender {
[mSubjectLabel resignFirstResponder];
}
- (IBAction)hidekeyBoard2:(id)sender
{
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)registerForKeyboardNotifications {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeShown:)
name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
- (void)keyboardWillBeShown:(NSNotification*)aNotification {
CGRect backgroundViewFrame = self.view.frame;
if (backgroundViewFrame.origin.y >= 0)
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
backgroundViewFrame.origin.y -= 100;
self.view.frame = backgroundViewFrame;
[UIView commitAnimations];
}
}
- (void)keyboardWillBeHidden:(NSNotification*)aNotification {
CGRect backgroundViewFrame = self.view.frame;
// if (backgroundViewFrame.origin.y < 130)
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
backgroundViewFrame.origin.y += 100;
self.view.frame = backgroundViewFrame;
[UIView commitAnimations];
}
}
- (void)textViewDidChange:(UITextView *)textView {
}
- (void) resignIfResponder {
if ([mBodyText isFirstResponder])
[mBodyText resignFirstResponder];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)onSendMail:(id)sender {
NSLog(@"%@",mSubjectLabel.text);
NSMutableString *subject = [NSMutableString string];
[subject appendString:mSubjectLabel.text];
NSMutableString *mailbody = [NSMutableString string];
[mailbody appendString:mBodyText.text];
NSString *recipients = [NSString stringWithFormat:@"mailto:test@test.com?&subject=%@!",subject];
NSString *body = [NSString stringWithFormat:@"&body=%@!",mailbody];;
NSString *emailString = [NSString stringWithFormat:@"%@%@", recipients, body];
emailString = [emailString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
if ([[UIApplication sharedApplication] canOpenURL:[ NSURL URLWithString:@"mailto:"]])
{
NSLog(@"Can Send");
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:emailString]];
}
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if (![[touch view] isKindOfClass:[UITextField class]]) {
[self.view endEditing:YES];
}
[super touchesBegan:touches withEvent:event];
}
- (NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}
@end
请问我是否需要粘贴更多文件。我无法理解如何删除重新启动的歌曲。请帮忙。感谢名单。