AFNetWorking下载网络音乐视频或者图片

healp.h

#import <Foundation/Foundation.h>

@interface Healp : NSObject

typedef void(^filePath)(NSString  *data);

+(void)downLoadUrlString:(NSString *)urlStr returnStr:(filePath)str;

@end

healp.m

#import "Healp.h"
#import <AFNetworking.h>

@implementation Healp

+(void)downLoadUrlString:(NSString *)urlStr returnStr:(filePath)str{
    AFHTTPSessionManager *manager  = [AFHTTPSessionManager manager];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlStr]];
    NSURLSessionDownloadTask *download  =[manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {

    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]stringByAppendingPathComponent:response.suggestedFilename];
        return [NSURL fileURLWithPath:filePath];

    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        NSString *strp = [NSString stringWithFormat:@"%@",filePath];
        str(strp);
    }];
    [download resume];

}
@end

调用

#import "ViewController.h"
#import "Healp.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
     self.simple = [TonePlayerSimple tonePlayer];

    NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *urlStr = [NSString stringWithFormat:@"http://fdfs.xmcdn.com/group11/M00/AD/5F/wKgDa1ZfFi-gRNYMABuxsyS4ea4688.mp3"];
    NSString *str = [urlStr lastPathComponent];//截取文件名wKgDa1ZfFi-gRNYMABuxsyS4ea4688.mp3
    NSString *filePath = [NSString stringWithFormat:@"%@/%@",docDirPath,str];
    BOOL isHave = [[NSFileManager defaultManager] fileExistsAtPath:filePath];//判断是不是已经存在
     if (isHave) {
	//如果已经下载就直接使用
       //直接调用filePath
    }else{
	//如果没有下载就先下载在使用
        [Healp downLoadUrlString:urlStr returnStr:^(NSString *data) {
        //直接调用data
        }];

    }
}

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