Question

为什么我的loginAuth卡在了while循环中？

我将connectionFinishLoading声明为

@interface LoginViewController : UIViewController {   
    BOOL connectionFinishLoading;
}
@property (nonatomic, assign) BOOL connectionFinishLoading;

@implementation LoginViewController
@synthesize connectionFinishLoading;

 -(BOOL)loginAuth {

    NSString *requestString = [NSString stringWithFormat:@"http:myURL?id=%@&format=JSON", userName.text];
    NSMutableURLRequest *requestURL = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:requestString]];
    loginConnection = [[NSURLConnection alloc] initWithRequest:requestURL delegate:self startImmediately:YES];
    [SVProgressHUD showInView:self.view status:@"Logging in"];
    while (!connectionFinishLoading) {
        NSLog(@"waiting..");
    }
     // code to executed after connection did finish loading.
}

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

    [responseData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    connectionFinishLoading = YES;
}

Answer 1

因为您阻止了运行循环并且没有数据包通过网络发送，因此连接永远不会完成。

Answer 2

尝试添加：

- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error
// A delegate method called by the NSURLConnection if the connection fails. 
// Production quality code would either display or log the actual error.
{
   #pragma unused(conn)
   #pragma unused(error)
   assert(conn == self.connection);

   NSLog(@"didFailWithError %@", error);

   connectionFinishLoading = YES;
}

但是创建这样的循环是非常糟糕的做法

Answer 3

正如JustSid所说，运行循环被阻止。我建议删除“while”循环和BOOL connectionDidFinishLoading属性，然后将要执行的代码移动到connectionDidFinishLoading方法中。您仍应以某种方式处理连接失败块。

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    // code to executed after connection did finish loading.
}

陷入这个while循环中

3 个答案: