Media Player (Avaudioplayer,mpmovieplayerviewcontroller)

Overview

This chapter mainly receives the last article about audio playback, because audio playback does not have a corresponding playback view control, so this example has drawn a simple music playback interface, including return, pause/play, progress control and so on.

results show

(Pause/Play playback progress drag back)

Process Overview

1. Take the last process to create a new music playback class, simulating the implementation of Mpmovieplayerviewcontroller;

2. When playing audio, use iOS built-in class Avaudioplayer, which supports playing music in Wav.mp3 and other formats, and its corresponding proxy class is avaudioplayerdelegate;

3. For this initialization assignment code: self._buttonplaypause = [[UIButton alloc] init]; It suddenly occurred to me that this assignment would present a memory leak . , because assigning memory directly to an attribute variable , variable retain two times and finally only Release one time. So many of the previous code is problematic . SWEAT!!!

4.nsnotificationcenter Add monitoring Note that object is not empty and should be set to nil, can not lead to difficult to find memory crash problem.

Main codeh file

musicplayerviewcontroller.h//mediaplayer////Created by God Lin on 14/12/15.//Copyright (c) 2014 Arbboter. All rights reserved.//#import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface    Musicplayerviewcontroller:uiviewcontroller <avaudioplayerdelegate>{avaudioplayer* _audioPlayer;    uibutton* _buttonplaypause;    uibutton* _buttonreturn;    Uiimage* _imagepause;    Uiimage* _imageplay;    Uiimage* _imagereturn;    uislider* _sliderplayer;    nsurl* _urlmusic;    nstimer* _timerplayprocess;        BOOL _bplay;    uitextview* _textviewinfo; nsstring* _titlemusic;} @property (nonatomic, retain) avaudioplayer* _audioplayer; @property (nonatomic, retain) uibutton* _buttonplaypause;@ Property (Nonatomic, retain) uibutton* _buttonreturn; @property (nonatomic, retain) uislider* _sliderplayer; @property ( Nonatomic, retain) nsurl* _urlmusic, @property (nonatomic, retain) uiimage* _imagepause; @property (nonatomic, retain) uiimage* _imageplay; @properTy (nonatomic, retain) uiimage* _imagereturn; @property (nonatomic, ReadWrite) BOOL _bplay; @property (nonatomic, retain) N stimer* _timerplayprocess; @property (nonatomic, retain) uitextview* _textviewinfo; @property (nonatomic, retain) nsstring* _titlemusic;-(ID) Initwithcontenturl: (nsurl*) url;-(void) Setcontenturl: (nsurl*) URL; @endvoid                         Audiofinishedcallback (Systemsoundid idsound, void* data);

m file

musicplayerviewcontroller.m//mediaplayer////Created by God Lin on 14/12/15.//Copyright (c) 2014 Arbboter. All rights reserved.//#import "MusicPlayerViewController.h" @interface Musicplayerviewcontroller () @ End@implementation musicplayerviewcontroller@synthesize _audioplayer, _urlmusic; @synthesize _buttonPlayPause, _ Buttonreturn, @synthesize _sliderplayer, _titlemusic, @synthesize _imagepause, _imagereturn, _imageplay; @synthesize _ Bplay, _timerplayprocess, _textviewinfo;//layout-(void) Dorotateaction: (nsnotification *) notification{[self relayout];}    -(void) relayout{cgfloat x = self.view.frame.origin.x;    CGFloat y = self.view.frame.origin.y + 20;    CGFloat w = self.view.frame.size.width;        CGFloat h = self.view.frame.size.height-20;    CGFloat x1 = 0;    CGFloat y1 = 0;    CGFloat W1 = 0;    CGFloat h1 = 0;        uiimage* image = Self._imagepause;    if (W < h) {image = [UIImage imagenamed:@ "Oca.jpeg"]; } else {image = [UIImage imagenamed:@ "Flower.jpg"];        } Self.view.backgroundColor = [Uicolor colorwithpatternimage:image];    image = Self._imagereturn;    X1 = x + 5;    Y1 = y + 5;    W1 = Image.size.width;    H1 = Image.size.height;        Self._buttonreturn.frame = CGRectMake (x1, y1, W1, H1);    image = Self._imagepause;    X1 = x + 5;    Y1 = (y + h)-(image.size.height + 5);    W1 = Image.size.width;    H1 = Image.size.height;        Self._buttonplaypause.frame = CGRectMake (x1, y1, W1, H1);    X1 + = Image.size.width;    W1 = x + w-5-X1;        Self._sliderplayer.frame = CGRectMake (x1, y1, W1, H1);    X1 = x + 5;    Y1 = y + h/4;    W1 = w-10;    H1 = H/2;    nsarray* Fontarray = [Uifont familynames];    nsstring* fontname = [Fontarray objectatindex:arc4random ()%[fontarray Count]];    _textviewinfo.font = [Uifont fontwithname:fontname SIZE:H1/10];    _textviewinfo.frame = CGRectMake (x1, y1, W1, H1);    _textviewinfo.editable = NO;    _textviewinfo.textalignment = Nstextalignmentcenter; _textViewinfo.backgroundcolor = [Uicolor clearcolor];} Playback interface Controls-(void) ondragplayprocess{[Self._audioplayer setcurrenttime:self._sliderplayer.value];}        -(void) onplayprocess{self._sliderplayer.value = Self._audioplayer.currenttime;    Nsinteger ntime = _sliderplayer.value;    Nsinteger nmaxtime = _sliderplayer.maximumvalue; nsstring* info = [[NSString alloc] initwithformat:@ "%@\n%02ld:%02ld-%02ld:%02ld", _titlemusic, NTIME/60, nTime%60, NMax    TIME/60, nmaxtime%60];    _textviewinfo.text = info; [Info release];}    Set Playback file-(ID) Initwithcontenturl: (nsurl*) url{self = [super init];    if (self) {[self setcontenturl:url]; } return self;} -(void) Setcontenturl: (nsurl*) url{self._urlmusic = URL;} Start playback, before the screen appears-(void) Viewwillappear: (BOOL) animated{[self onplay];}        -(void) viewdidload{[Super Viewdidload];    Self._imageplay = [UIImage imagenamed:@ "Play.png"];    Self._imagepause = [UIImage imagenamed:@ "Pause.png"]; Self._imagereturn = [UIImage imagenamed:@"Return.png"];    It suddenly occurred to me that this assignment would be a memory leak, allocation of memory directly assigned to the attribute variable//because retain two times finally only release once, so a lot of previous problems//SWEAT!!!    uibutton* button = nil;    button = [[UIButton alloc] init];    Self._buttonplaypause = button;    [Button release];    [Self.view Addsubview:self._buttonplaypause];    [Self._buttonplaypause Setimage:self._imagepause Forstate:uicontrolstatenormal]; [Self._buttonplaypause addtarget:self Action: @selector (Onplaypause) forcontrolevents:uicontroleventtouchupinside]        ;     button = [[UIButton alloc] init];    Self._buttonreturn = button;    [Button release];    [Self.view Addsubview:self._buttonreturn];    [Self._buttonreturn Setimage:self._imagereturn Forstate:uicontrolstatenormal];        [Self._buttonreturn addtarget:self Action: @selector (OnStop) forcontrolevents:uicontroleventtouchupinside];    uislider* slider = [[UISlider alloc] init];    Self._sliderplayer = slider;    [Slider release];    [Self.view Addsubview:self._sliderplayer]; [Self._sliderplayer AddTarget: Self action: @selector (ondragplayprocess) forcontrolevents:uicontroleventvaluechanged];    uitextview* TextView = [[Uitextview alloc] init];    Self._textviewinfo = TextView;    [TextView release];        [Self.view Addsubview:_textviewinfo];        [Self relayout]; Cutting screen [[Nsnotificationcenter defaultcenter] addobserver:self selector: @sele                                               ctor (dorotateaction:) name:uideviceorientationdidchangenotification Object:self];}        -(void) onplay{if (!_bplay) {nserror* error;        Self._bplay = YES;        avaudioplayer* player = [[Avaudioplayer alloc] Initwithcontentsofurl:self._urlmusic error:&error];        Self._audioplayer = player;        [Player release];                Self._audioplayer.delegate = self; self._timerplayprocess = [Nstimer scheduledtimerwithtimeinterval:1 target:self selector: @selector (onplayprocess) UserInfo:nil Repeats:yes];        Self._audioplayer;        Self._sliderplayer.maximumvalue = 0.0f;        Set Playback duration self._sliderplayer.maximumvalue = self._audioplayer.duration;                [Self._audioplayer play];        Illegal audio if (_sliderplayer.maximumvalue = = 0) {[Self onStop];    } [self onplayprocess];    }}-(void) onstop{[self dismissviewcontrolleranimated:yes completion:nil];    [Self._audioplayer stop];    [Self._timerplayprocess invalidate]; _bplay = NO;}    -(void) onplaypause{uiimage* image = nil;    _bplay =!_bplay;        if (_bplay) {image = Self._imagepause;    [Self._audioplayer play];        } else {image = Self._imageplay;    [Self._audioplayer pause]; } [Self._buttonplaypause setimage:image forstate:uicontrolstatenormal];}    -(void) didreceivememorywarning{[Super didreceivememorywarning]; Dispose of any resources the can be recreated.}    -(void) dealloc{[_buttonreturn release];    [_buttonplaypause release];    [_imagereturn release];    [_imagepause release];    [_imageplay release];    [_audioplayer release];    [_urlmusic release];    [_sliderplayer release];    [[Nsnotificationcenter Defaultcenter] removeobserver:self]; [Super Dealloc];} #pragma mark-avaudioplayerdelegate-(void) audioplayerdidfinishplaying: (Avaudioplayer *) player successfully: (BOOL)    flag{NSLog (@ "Music play over"); [Self onStop];} /* If an error occurs while decoding it is reported to the delegate. */-(void) Audioplayerdecodeerrordidoccur: (Avaudioplayer *) Player ERROR: (Nserror *) error{NSLog (@ "Music Play occured ER    Ror "); [Self onStop];} @end//audio playback callback function void Audiofinishedcallback (Systemsoundid idsound, void* data) {Audioservicesdisposesystemsoundid ( Idsound);}

Project Engineering

Media Player (Avaudioplayer,mpmovieplayerviewcontroller)