can setText for WKInterfaceLabel in init method but not in didselectrow method

问题

I have a storyboard with two scenes, both scenes are handled by the same WKInterfaceController. In the second scene there are 3 WKInterfaceLabels

In the init() method of the interface controller I am able to change the Label with setText function. When I try to change the WKInterfaceLabel "Dienst" in

- (void)table:(WKInterfaceTable *)table didSelectRowAtIndex:(NSInteger)rowIndex
    NSManagedObject *dienst = [TableArray objectAtIndex:rowIndex];
    [self.Dienst setText:@"Selected"];
    NSError *error;
    NSString *MP = [self read_KC_Pass:&error];
    [self.Benutzer setText:[self get_Benutzer:[dienst valueForKey:@"dienst"]:MP]];
    [self pushControllerWithName:@"Detail" context:nil];

The Value of WKInterfaceLabel Dienst is nil. Does anybody has a clue? I am not used to storyboard The outlet is defined, can be accessed in the init() method, but not in another method

来源：https://stackoverflow.com/questions/29736155/can-settext-for-wkinterfacelabel-in-init-method-but-not-in-didselectrow-method