IOS菜鸟的所感所思(十)——专辑接口和专辑中歌曲数据的获得（上）-优快云博客

本文链接：https://blog.youkuaiyun.com/MyCodeDancer/article/details/46412579

目标：根据接口提供的参数获得专辑的数据并在UITableViewCell中显示出来。

获取专辑的接口:

请求地址url: http://music.163.com/api/search/get/web

需要设置的HTTP Haeder:
"Accept-Encoding”: "deflate,gzip"

"Content-Type”: "application/x-www-form-urlencoded"

"Referer”: "http://music.163.com/"

"User-Agent”: "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"

需要设置的HTTP Body:
NSString *body = [NSString stringWithFormat:@"s=%@&limit=%d&offset=%d&type=10”,搜索的关键字,当前返回的搜索结果数量num(num<=100),当前偏移量offset(offset==当前搜索的页数page*每页返回的结果num)];

需要设置的HTTP Method:

POST

这种接口我们现在写了几个了，因此它的套路就是

1.我们需要的东西放在callback中（比如这里面的我们需要的是：一个存放专辑的数组）

2.需要传入的参数：page，关键字key。

3.方法的实现

FetchDataFromNet.m文件中

#define kAlbumLimit 1

//方法的具体实现

+ (void)fetchAlbumData:(NSString *)key page:(NSInteger)page callback:(fetchTrackDataAndError)callback{

//获得网络地址并发送网络请求，设置相应的http的头信息

NSURL *albumUrl = [NSURLURLWithString:@"http://music.163.com/api/search/get/web"];

NSMutableURLRequest *request = [NSMutableURLRequestrequestWithURL:albumUrl];

[request setValue:@"deflate,gzip"forHTTPHeaderField:@"Accept-Encoding"];

[request setValue:@"application/x-www-form-urlencoded"forHTTPHeaderField:@"Content-Type"];

[request setValue:@"http://music.163.com/"forHTTPHeaderField:@"Referer"];

[request setValue:@"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"forHTTPHeaderField:@"User-Agent"];

//请求方法的类型

[requestsetHTTPMethod:@"POST"];

//定义内容的信息，需要定义kAlbumLimit（设置获得专辑的个数）（建议你测试的时候设置成一个）

NSString *bodyString = [NSStringstringWithFormat:@"s=%@&limit=%d&offset=%ld&type=10",key,kAlbumLimit,page *kAlbumLimit];

[request setHTTPBody:[bodyStringdataUsingEncoding:NSUTF8StringEncoding]];

//发送URL的连接，发送异步的获取数据的请求

[NSURLConnectionsendAsynchronousRequest:request queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response,NSData *data, NSError *connectionError) {

//异常的处理

if (connectionError) {

callback(nil, page, connectionError);

}else{

NSMutableArray *albumArray = [NSMutableArraynew];

@try {

//用json格式解析获得到的数据（你可以打印出来看一下，因为我们需要解析里面的具体的数据）

NSDictionary *albumDic = [NSJSONSerializationJSONObjectWithData:data options:kNilOptions error:nil];

// NSLog(@"albumDic:%@",albumDic);

//只有你知道albumDic字典的结构才能做下面的事，根据key去获得对应的专辑的数组（建议看一下这个数组）

NSArray *albumItemArray = [[albumDic objectForKey:@"result"]objectForKey:@"albums"];

// NSLog(@"%@",albumItemArray);

//下面的代码你需要搞清楚专辑的结构，还有你需要的数据，这样你需要建一个类albumData，所以得完成准备工作。

//for循环使得albumItemArray中的每一个对象都传入AlbumData接口中进行初始化，并且最后一个个添加到albumArray，并返回

[albumItemArrayenumerateObjectsUsingBlock:^(id obj,NSUInteger idx, BOOL *stop) {

AlbumData *albumData = [AlbumDataalbumDataWithDic:obj];

if (albumData) {

[albumArray addObject:albumData];

}

}];

}

@catch (NSException *exception) {

}

@finally {

callback(albumArray, page,nil);

}

}];

}

这个测试你需要在一个viewDidLoad中调用+ (void)fetchAlbumData:(NSString *)key page:(NSInteger)page callback:(fetchTrackDataAndError)callback

至于key可以设置成@“df”，随便设置的。page = 10；

我们需要看一下NSLog(@"albumDic:%@",albumDic);字典中的内容：

albumDic:{

code = 200;

result = {

albumCount = 9999;

albums = (

{

alias = (

);

artist = {

albumSize = 44;

alias = (

"\U94f6\U68ee",

"\U30b7\U30eb\U30d5\U30a9\U30ec"

);

briefDesc = "";

id = 21354;

img1v1Id = 0;

img1v1Url = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

musicSize = 288;

name = "Silver Forest";

picId = 936783906918296;

picUrl = "http://p3.music.126.net/0-gzlqU6jGW8etl5i_dGAQ==/936783906918296.jpg";

trans = "";

};

artists = (

{

albumSize = 0;

alias = (

);

briefDesc = "";

id = 21354;

img1v1Id = 0;

img1v1Url = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

musicSize = 0;

name = "Silver Forest";

picId = 0;

picUrl = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

trans = "";

}

);

blurPicUrl = "http://p4.music.126.net/IvcY_Sy0R1tP1BUZ2aLiog==/849922488271112.jpg";

briefDesc = "";

commentThreadId = "R_AL_3_81657";

company = C76;

companyId = 0;

copyrightId = 0;

description = "";

id = 81657;

name = "\U4e1c\U65b9\U30ce\U30b9\U30bf\U30eb\U30b8\U30a2";

pic = 849922488271112;

picId = 849922488271112;

picUrl = "http://p3.music.126.net/IvcY_Sy0R1tP1BUZ2aLiog==/849922488271112.jpg";

publishTime = 1250265600000;

size = 10;

songs = (

);

status = 1;

tags = "";

type = "\U4e13\U8f91";

}

);

};

}

看了之后，我们需要知道album中数据因此才有后面的代码：

NSArray *albumItemArray = [[albumDic objectForKey:@"result"]objectForKey:@"albums"];

接下来要做的就是：

NSLog(@"%@",albumItemArray);

(

{

alias = (

);

artist = {

albumSize = 44;

alias = (

"\U94f6\U68ee",

"\U30b7\U30eb\U30d5\U30a9\U30ec"

);

briefDesc = "";

id = 21354;

img1v1Id = 0;

img1v1Url = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

musicSize = 288;

name = "Silver Forest";

picId = 936783906918296;

picUrl = "http://p3.music.126.net/0-gzlqU6jGW8etl5i_dGAQ==/936783906918296.jpg";

trans = "";

};

artists = (

{

albumSize = 0;

alias = (

);

briefDesc = "";

id = 21354;

img1v1Id = 0;

img1v1Url = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

musicSize = 0;

name = "Silver Forest";

picId = 0;

picUrl = "http://p4.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg";

trans = "";

}

);

blurPicUrl = "http://p4.music.126.net/IvcY_Sy0R1tP1BUZ2aLiog==/849922488271112.jpg";

briefDesc = "";

commentThreadId = "R_AL_3_81657";

company = C76;

companyId = 0;

copyrightId = 0;

description = "";

id = 81657;

name = "\U4e1c\U65b9\U30ce\U30b9\U30bf\U30eb\U30b8\U30a2";

pic = 849922488271112;

picId = 849922488271112;

picUrl = "http://p3.music.126.net/IvcY_Sy0R1tP1BUZ2aLiog==/849922488271112.jpg";

publishTime = 1250265600000;

size = 10;

songs = (

);

status = 1;

tags = "";

type = "\U4e13\U8f91";

}

)

现在我们知道album中需要哪些属性了，可以有blurPicUrl（专辑的图片），name（专辑的名字），id（专辑的id，后面会用到），artistName（artists中的name）。

因此在albumData的接口中你可以这样写：

AlbumData.h文件中：

@interface AlbumData : NSObject

@property (nonatomic, strong) NSString *albumID;

@property (nonatomic, strong) NSString *albumName;

@property (nonatomic, strong) NSString *albumImage;

@property (nonatomic, strong) NSString *artist;

+ (id)albumDataWithDic:(NSDictionary *)dic;

AlbumData.m文件中：

@implementation AlbumData

+(id)albumDataWithDic:(NSDictionary *)dic{

return [[self alloc] initWithDic:dic];

}

- (id)initWithDic:(NSDictionary *)dic{

if (self = [super init]) {

self.albumID = [dic objectForKey:@"id"];

self.albumName = [dic objectForKey:@"name"];

self.albumImage = [dic objectForKey:@"picUrl"];

self.artist = [[dic objectForKey:@"artist"] objectForKey:@"name"];

}

return self;

}

这样你在albumItemArray数组中的每一个对象都会对里面的值进行key的设置。

接下来就是创建一个视图控制器AlbumSearch，控制视图。至于视图中的cell我们还会使用自定义的，可以复用之前我们已经弄好的CollectViewCell

是继承UITableViewCell的

控制器中的代码我会放在下一篇中。