我知道这种问题已经被问过很多次了，但他们都指向说连接必须在不同的线程上。
-(void)distanceMatrix{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:distanceMatrixURL]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:10];
connection2 = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
[connection2 scheduleInRunLoop:[NSRunLoop mainRunLoop]
forMode:NSDefaultRunLoopMode];
NSLog(@"Is%@ main thread", ([NSThread isMainThread] ? @"" : @" NOT"));
[connection2 start];
if (connection2)
{
responseData2 = [NSMutableData data];
connectionIsActive = YES;
} else {
NSLog(@"connection failed");
}
}
- (void)connection2:(NSURLConnection *)connection2 didReceiveResponse:(NSURLResponse *)response
{NSLog(@"recieved response");
[responseData2 setLength:0];
}
- (void)connection2:(NSURLConnection *)connection2 didReceiveData:(NSData *)data
{
[responseData2 appendData:data];
}
- (void)connection2:(NSURLConnection *)connection2 didFailWithError:(NSError *)error
{
connectionIsActive = NO;
NSLog(@"failed!!");
}
- (void)connection2DidFinishLoading:(NSURLConnection *)conn
{
connectionIsActive = NO;
SBJsonParser *json = [[SBJsonParser alloc] init];
NSString *responseString = [[NSString alloc] initWithData:responseData2 encoding:NSUTF8StringEncoding];
NSError *jsonError = nil;
NSDictionary *parsedJSON = [json objectWithString:responseString error:&jsonError];
travelTime= [[[[parsedJSON valueForKey:@"rows"] valueForKey:@"elements"] valueForKey:@"duration"] valueForKey:@"text"];
NSLog(@"traveltime = %@", travelTime);
}
当我记录它时，它说它在主线程上运行。Connection2 处于活动状态，但没有调用任何代表。
另外，这是我调用 distanceMatrix 方法的方式
-(id)initWithJsonResultDict:(NSDictionary *)jsonResultDict andUserCoordinates: (CLLocationCoordinate2D)userCoords andTimeURL:(NSString*)timeURL
{
self.distanceMatrixURL = timeURL;
[self distanceMatrix];
//more code here for other purposes
}