iOS獲取系統(tǒng)iTunes音樂

• 1.1-簡介
• 1.2-使用系統(tǒng)自帶的控制器選擇iTunes歌曲
• 1.3-只獲取iTunes中的數(shù)據(jù)，自定義界面
• 1.4—完整代碼

1.1-簡介

• 獲取類型iTune音樂非常類似于UIKit框架中UIImagePickerController圖片選取器的用法，既可以直接使用系統(tǒng)自帶的媒體選擇器也可以只獲取系統(tǒng)的數(shù)據(jù)加載到自定義界面中

• 與UIImagePickerController不同的是，MPMediaPickerController媒體選擇器是放在<MediaPlayer/MediaPlayer.h>框架中的

1.2-使用系統(tǒng)自帶的控制器選擇iTunes歌曲

#pragma mark -使用系統(tǒng)自帶的控制器- (void)presentiTunesMediaPickerController {//1.創(chuàng)建媒體選擇器/**MPMediaType（大概有13種，這里只列出比較常用的幾種）MPMediaTypeMusic:音樂歌曲MPMediaTypePodcast：博客（有聲雜志）MPMediaTypeAudioITunesU:iTuneU中的有聲讀物MPMediaTypeMovie：電影*/MPMediaPickerController *controller = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];//2.是否支持多選,默認為nocontroller.allowsPickingMultipleItems = YES;//在導航欄的上方添加一個提示文本controller.prompt = @"傳智播客-黑馬程序員";//3.設置代理（代理比較簡單，只有兩個方法，完成選取和取消選取）controller.delegate = self;//4.彈出媒體選擇器[self presentViewController:controller animated:YES completion:nil]; }

• MPMediaPickerControllerDelegate代理

#pragma mark -MPMediaPickerControllerDelegate//完成選取 - (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {for (MPMediaItem *song in mediaItemCollection.items) {//解析數(shù)據(jù)[self resolverMediaItem:song];}//解除媒體選擇器器[mediaPicker dismissViewControllerAnimated:YES completion:nil]; }//取消選取 - (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {//解除媒體選擇器器[mediaPicker dismissViewControllerAnimated:YES completion:nil]; }

• 解析iTunes歌曲數(shù)據(jù)

#pragma mark -解析iTune音樂數(shù)據(jù) - (void)resolverMediaItem:(MPMediaItem *)song {//歌名NSString *name = [song valueForProperty: MPMediaItemPropertyTitle];//歌曲路徑NSString *url = [song valueForProperty: MPMediaItemPropertyAssetURL];//歌手名字NSString *songer = [song valueForProperty: MPMediaItemPropertyArtist];//歌曲時長（單位：秒）NSTimeInterval INW = [[song valueForProperty: MPMediaItemPropertyPlaybackDuration] doubleValue];NSString *time;if((int)INW%60<10){time = [NSString stringWithFormat:@"%d:0%d",(int)INW/60,(int)INW%60];}else{time = [NSString stringWithFormat:@"%d:%d",(int)INW/60,(int)INW%60];}if(songer == nil){songer = @"未知歌手";}//歌曲插圖（如果沒有插圖，則返回nil）MPMediaItemArtwork *artwork = [song valueForProperty: MPMediaItemPropertyArtwork];//從插圖中獲取圖像，參數(shù)size是圖像的大小UIImage *image = [artwork imageWithSize:CGSizeMake(50, 50)];self.label.text = [NSString stringWithFormat:@"歌名：%@ \n 歌曲路徑：%@ \n 歌手名字:%@ \n 歌曲時長%@ \n 歌曲插圖：%@",name,url,songer,time,image]; }

1.3-只獲取iTunes中的數(shù)據(jù)，自定義界面

• 解析數(shù)組的操作與使用系統(tǒng)自帶控制器的方式一致

// 1.創(chuàng)建媒體選擇隊列（從ipod庫中讀出音樂文件）MPMediaQuery *everything = [[MPMediaQuery alloc] init];// 2.創(chuàng)建讀取條件(類似于對數(shù)據(jù)做一個篩選) Value：作用等同于MPMediaType枚舉值MPMediaPropertyPredicate *albumNamePredicate =[MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeMusic ] forProperty: MPMediaItemPropertyMediaType];//3.給隊列添加讀取條件[everything addFilterPredicate:albumNamePredicate];//4.從隊列中獲取符合條件的數(shù)組集合NSArray *itemsFromGenericQuery = [everything items];//5.便利解析數(shù)據(jù)for (MPMediaItem *song in itemsFromGenericQuery) {[self resolverMediaItem:song];}

1.4—完整代碼

#import "ViewController.h"#import <MediaPlayer/MediaPlayer.h> #import <CoreFoundation/CoreFoundation.h> @interface ViewController ()<MPMediaPickerControllerDelegate> @property (weak, nonatomic) IBOutlet UILabel *label;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib. }- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {[self presentiTunesMediaPickerController]; }#pragma mark -使用系統(tǒng)自帶的控制器- (void)presentiTunesMediaPickerController {//1.創(chuàng)建媒體選擇器/**MPMediaType（大概有13種，這里只列出比較常用的幾種）MPMediaTypeMusic:音樂歌曲MPMediaTypePodcast：博客（有聲雜志）MPMediaTypeAudioITunesU:iTuneU中的有聲讀物MPMediaTypeMovie：電影*/MPMediaPickerController *controller = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];//2.是否支持多選,默認為nocontroller.allowsPickingMultipleItems = YES;//在導航欄的上方添加一個提示文本controller.prompt = @"傳智播客-黑馬程序員";//3.設置代理（代理比較簡單，只有兩個方法，完成選取和取消選取）controller.delegate = self;//4.彈出媒體選擇器[self presentViewController:controller animated:YES completion:nil]; }#pragma mark -只獲取iTunes中的數(shù)據(jù)，界面自定義 - (void)getiTuneLibrary {// 1.創(chuàng)建媒體選擇隊列（從ipod庫中讀出音樂文件）MPMediaQuery *everything = [[MPMediaQuery alloc] init];// 2.創(chuàng)建讀取條件(類似于對數(shù)據(jù)做一個篩選) Value：作用等同于MPMediaType枚舉值MPMediaPropertyPredicate *albumNamePredicate =[MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeMusic ] forProperty: MPMediaItemPropertyMediaType];//3.給隊列添加讀取條件[everything addFilterPredicate:albumNamePredicate];//4.從隊列中獲取符合條件的數(shù)組集合NSArray *itemsFromGenericQuery = [everything items];//5.便利解析數(shù)據(jù)for (MPMediaItem *song in itemsFromGenericQuery) {[self resolverMediaItem:song];} }#pragma mark -解析iTune音樂數(shù)據(jù) - (void)resolverMediaItem:(MPMediaItem *)song {//歌名NSString *name = [song valueForProperty: MPMediaItemPropertyTitle];//歌曲路徑NSString *url = [song valueForProperty: MPMediaItemPropertyAssetURL];//歌手名字NSString *songer = [song valueForProperty: MPMediaItemPropertyArtist];//歌曲時長（單位：秒）NSTimeInterval INW = [[song valueForProperty: MPMediaItemPropertyPlaybackDuration] doubleValue];NSString *time;if((int)INW%60<10){time = [NSString stringWithFormat:@"%d:0%d",(int)INW/60,(int)INW%60];}else{time = [NSString stringWithFormat:@"%d:%d",(int)INW/60,(int)INW%60];}if(songer == nil){songer = @"未知歌手";}//歌曲插圖（如果沒有插圖，則返回nil）MPMediaItemArtwork *artwork = [song valueForProperty: MPMediaItemPropertyArtwork];//從插圖中獲取圖像，參數(shù)size是圖像的大小UIImage *image = [artwork imageWithSize:CGSizeMake(50, 50)];self.label.text = [NSString stringWithFormat:@"歌名：%@ \n 歌曲路徑：%@ \n 歌手名字:%@ \n 歌曲時長%@ \n 歌曲插圖：%@",name,url,songer,time,image]; }#pragma mark -MPMediaPickerControllerDelegate//完成選取 - (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {for (MPMediaItem *song in mediaItemCollection.items) {//解析數(shù)據(jù)[self resolverMediaItem:song];}//解除媒體選擇器器[mediaPicker dismissViewControllerAnimated:YES completion:nil]; }//取消選取 - (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {//解除媒體選擇器器[mediaPicker dismissViewControllerAnimated:YES completion:nil]; }- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated. }@end 與50位技術專家面對面20年技術見證，附贈技術全景圖

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