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completionHandler完成时如何返回数据?这个方法我试过,但它显示了一个错误:sendAsynchronousRequest和completionHandler返回方法
- (NSData *)ReturnDataFromUrl{
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com"]];
[NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
return data;
}];
}