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我想在单个视图控制器类中创建两个连接。为此我使用NSOperationQueue。两个连接创建在两个函数中，并推入队列中。问题是代理不被调用。请帮助我。感谢您提前异步连接没有被调用
- (void)viewDidLoad {
[super viewDidLoad];
NSOperationQueue *queue=[[NSOperationQueue alloc] init];
NSInvocationOperation *invOperation1 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(createConnection1) object:nil];
NSInvocationOperation *invOperation2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(createConnection2) object:nil];
NSArray *ops=[[NSArray alloc] initWithObjects:invOperation1,invOperation2,nil];
[queue addOperations:ops waitUntilFinished:YES];
}
-(void) createConnection1{
//create connection
NSLog(@"Create Connection 1");
url1 =[[NSMutableString alloc] initWithFormat:@"http://www.google.com/ig/api?weather=New Delhi"];
NSURLRequest *theRequest1=[NSURLRequest requestWithURL:[NSURL URLWithString:url1]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
theConnection1=[[NSURLConnection alloc] initWithRequest:theRequest1 delegate:self];
if (theConnection1) {
connectionCreated1=YES;
receivedData1 = [[NSMutableData data] retain];
NSLog(@"received data 1 %@",receivedData1);
//[theConnection1 setDelegate:self];
}
}
-(void) createConnection2{
//create connection
NSLog(@"Create Connection 2");
url2 =[[NSMutableString alloc] initWithFormat:@"http://www.google.com/ig/api?weather=Chennai"];
NSURLRequest *theRequest2=[NSURLRequest requestWithURL:[NSURL URLWithString:url2]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
theConnection2=[[NSURLConnection alloc] initWithRequest:theRequest2 delegate:self];
if (theConnection2) {
connectionCreated2=YES;
receivedData2 = [[NSMutableData data] retain];
//[theConnection2 setDelegate:self];
NSLog(@"received data 2 %@",receivedData2);
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
if (connectionCreated1==YES) {
[receivedData1 setLength:0];
}
else if (connectionCreated2==YES) {
[receivedData2 setLength:0];
}
else {
NSLog(@"did not receive response");
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
if (connectionCreated1==YES) {
[theConnection1 release];
xmlParser1 = [[NSXMLParser alloc] initWithData:receivedData1];
[xmlParser1 setDelegate:self];
[xmlParser1 parse];
}
else if(connectionCreated2==YES){
[theConnection2 release];
xmlParser2 = [[NSXMLParser alloc] initWithData:receivedData2];
[xmlParser2 setDelegate:self];
[xmlParser2 parse];
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"connection failed" message:@"" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil];
[alert show];
[alert release];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
if (connectionCreated1==YES) {
[receivedData1 appendData:data];
}
else if(connectionCreated2==YES) {
[receivedData2 appendData:data];
}
else {
NSLog(@"data not received");
}
}
请请帮帮我。我很麻烦 –