注 ASIHttpRequest 在2012年之后就不在更新了
ASIHttpRequest 是一款極其強勁的HTTP訪問開源項目,讓簡單的API完成復雜的功能, 如:異步請求, 列隊請求,GZIP壓縮,緩存,斷點續傳,進度跟蹤,上傳文件,HTTP認證.在新的版本中,還加入了Objective-C 閉包 Block 的支持,讓我們的代碼更加簡潔靈活.
官方地址: http://allseeing-i.com/ASIHTTPRequest/How-wo-use
下載地址: http://github.com/pokeb/asi-http-request
依賴的5各庫文件:CFNetowork, SystemConfiguration, MobileCoreServices, 和libz. libxml2 這5個框架必須最先引入
同步請求
-(void)synchronousRequest {
if([self.urlField.text length] == 0) {
return;
}
// 初始化一個url
NSURL *url = [NSURL URLWithString:self.urlField.text];
// 設置請求方式
[request setRequestMethod:@"POST"];
// 發送一個同步請求
[request startSynchronous];
NSError *error = [request error];
if(!error) {
NSString *response = [request responseString];
self.textField.text = response;
}
}
異步請求
- (void)aSynchronousRequest {
if ([self.urlField.text length] == 0) {
return;
}
NSURL *url = [NSURL URLWithString:self.urlField.text];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[request startAsynchronous];// 發送異步請求
}
有兩個Block 判斷請求成功或失敗
[request setCompletionBlock:^{
NSLog(@"請求成功");
}];
[request setFailedBlock:^{
NSLog(@"請求失敗");
}];
同樣用delegate也可以
// 請求數據完成
- (void)requestFinished:(ASIHTTPRequest *)request {
NSData *data = request.responseData;
self.image = [UIImage imageWithData:data];
}
// 請求數據失敗
- (void)requestFailed:(ASIHTTPRequest *)request {
NSError *error = request.error;
NSLog(@"請求出錯: %@",error);
}
設置緩存
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:urlString]];
/*
* 設置緩存策略
* ASICacheForSessionDurationCacheStoragePolicy 程序瑕疵啟動會清楚本地的緩存
* ASICachePermanentlyCacheStoragePolicy 是持久緩存,程序下次啟動,緩存仍然還在
*/
request.cacheStoragePolicy = ASICachePermanentlyCacheStoragePolicy;
[request setDownloadCache:cache];
//開始異步請求網絡
[request startAsynchronous];
下載的實現
// 下載東西的地址
NSString *urlstring = @"http://hc25.aipai.com/user/656/20448656/6167672/card/25033081/card.mp4?l=a";
// 保存的文件路徑
NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
// 設置文件路徑下文件夾的名字
NSString *fileName = [urlstring lastPathComponent];
NSString *path = [documents stringByAppendingPathComponent:fileName];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:urlstring]];
[request setDownloadDestinationPath:path];
// 開始下載吧
[request startAsynchronous];
注: 一般來說下載是要和進度條綜合使用,這里我就不一一細說, progressView KVO監聽
