ios NSURLConnection 在 iOS9 中被弃用
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NSURLConnection deprecated in iOS9
提问by Maximilian
I want to download a file with a NSURLRequestand save it but in the line with the
我想下载一个带有 a 的文件NSURLRequest并保存它，但与
NSData * data = ...happens an error.
NSData * data = ...发生错误。
NSURL *Urlstring = [NSURL URLWithString:@"http://yourdomain.com/yourfile.pdf"];
NSURLRequest *request = [NSURLRequest requestWithURL: Urlstring];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
documentsURL = [documentsURL URLByAppendingPathComponent:@"localFile.pdf"];
[data writeToURL:documentsURL atomically:YES];
The warning Message is that i should use NSURLSession dataTaskwithrequest"because sendSynchronousRequestis deprecated in iOS 9 but that doesn't work I hope someone can help me
警告消息是我应该使用NSURLSession dataTaskwithrequest“因为sendSynchronousRequest在 iOS 9 中已弃用，但这不起作用我希望有人可以帮助我
回答by EnriMR
Now you have to use NSURLSession
现在你必须使用 NSURLSession
Example (GET):
示例（获取）：
-(void)placeGetRequest:(NSString *)action withHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))ourBlock {
NSString *urlString = [NSString stringWithFormat:@"%@/%@", URL_API, action];
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:ourBlock] resume];
}
Now you will need to call that method with an action (or your full URL if you prefer) and the block that will be executed when the API call return.
现在，您需要使用操作（或您的完整 URL，如果您愿意）和 API 调用返回时将执行的块来调用该方法。
[self placeGetRequest:@"action" withHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
// your code
}];
Inside that block, you will received a NSDatawith the response data and NSURLResponsewith the HTTP response. So now, you can put your code there:
在该块内，您将收到NSData带有响应数据和NSURLResponseHTTP 响应的 。所以现在，你可以把你的代码放在那里：
NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
documentsURL = [documentsURL URLByAppendingPathComponent:@"localFile.pdf"];
[data writeToURL:documentsURL atomically:YES];
Main difference between NSURLSession and NSURLConnection
NSURLSession 和 NSURLConnection 的主要区别
NSURLConnection: if we have an open connection with NSURLConnection and the system interrupt our App, when our App goes to background mode, everything we have received or sent were lost.
NSURLSession: solve this problem and also give us out of process downloads. It manage the connection process even when we don't have access. You will need to use
application:handleEventsForBackgroundURLSession:completionHandlerin your AppDelegate
NSURLConnection：如果我们与 NSURLConnection 有一个开放的连接并且系统中断了我们的应用程序，当我们的应用程序进入后台模式时，我们收到或发送的所有内容都会丢失。
NSURLSession：解决这个问题，也给我们提供进程外下载。即使我们没有访问权限，它也会管理连接过程。您将需要
application:handleEventsForBackgroundURLSession:completionHandler在您的 AppDelegate 中使用
So with the use of NSURLSession, you don't need to manage or to check your internet connection because OS does it for you.
因此，通过使用 NSURLSession，您无需管理或检查您的互联网连接，因为操作系统会为您完成。
