IOS自己封装的异步下载(get)Block方式回调给大家分享下

小牛一个希望大家多多关照。 上代码。

使用方法：造一个对象，调用

/**

 *  @brief  异步下载网络资源

 *

 *  @param  strURL URL连接(字符串形式)

 *  @param  updater block，下载成功调用的方法

 */

- (void)asynchronousDownload:(NSString *)url

                     success:(Success)success

                     failure:(Failure)failure;

方法。 

BLOCK 回调， 成功或失败。

#import <Foundation/Foundation.h>

@class Downloader;

typedef void(^Success)(Downloader *downloader);

typedef void(^Failure)(NSError *error);

@interface Downloader : NSObject <NSURLConnectionDataDelegate>

{

    long double _length;

    NSMutableData *_datas;

}

@property (nonatomic, assign) long double length;

@property (nonatomic, strong) NSMutableData *datas;

@property (nonatomic, copy) Success success;

@property (nonatomic, copy) Failure failure;

@property (nonatomic, strong) NSString *strURL;

/**

 *  @brief  异步下载网络资源

 *

 *  @param  strURL URL连接(字符串形式)

 */

- (void)asynchronousDownload:(NSString *)url;

/**

 *  @brief  异步下载网络资源

 *

 *  @param  strURL URL连接(字符串形式)

 *  @param  updater block，下载成功调用的方法

 */

- (void)asynchronousDownload:(NSString *)url

                     success:(Success)success

                     failure:(Failure)failure;

@end

#import "Downloader.h"

@implementation Downloader

/**

 *  @brief  异步下载网络资源

 *

 *  @param  strURL URL连接(字符串形式)

 */

- (void)asynchronousDownload:(NSString *)strURL

{

    NSLog(@"--->> Downloader 开始下载");

    self.strURL = strURL;

    NSURL *url = [NSURL URLWithString:[strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    

    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:100];

    

    [NSURLConnection connectionWithRequest:request delegate:self];

}

/**

 *  @brief  异步下载网络资源

 *

 *  @param  strURL URL连接(字符串形式)

 *  @param  success block，下载成功调用的方法

 *  @param  failure block，下载失败调用的方法

 */

- (void)asynchronousDownload:(NSString *)url success:(Success)success failure:(Failure)failure

{

    self.success = success;

    self.failure = failure;

    

    [self asynchronousDownload:url];

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    _length = response.expectedContentLength;

    _datas = [NSMutableData dataWithCapacity:_length];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [self.datas appendData:data];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    NSLog(@"--->> Downloader 下载完成");

    self.success(self);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    NSLog(@"\n----------------download error----------------- \n%@", error);

    self.failure(error);

}