MessageController (Text) Set Body not setting the body. (iOS

Question

-(IBAction)SendTextTapped:(id)sender{
  if ([MFMessageComposeViewController canSendText]) {
    MFMessageComposeViewController* messageController = [[MFMessageComposeViewController alloc] init];
    messageController.messageComposeDelegate = self;
    __block NSString *fullA = [[NSString alloc] init];
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    CLLocation *newerLocation = [[CLLocation alloc]initWithLatitude:21.1700
                                                      longitude:72.8300];
    [geocoder reverseGeocodeLocation:newerLocation
               completionHandler:^(NSArray *placemarks, NSError *error) {
                 if (error) {
                   NSLog(@"Geocode failed with error: %@", error);
                   return;
                 }
                 if (placemarks && placemarks.count > 0)
                 {
                   CLPlacemark *placemark = placemarks[0];
                   NSDictionary *addressDictionary =
                   placemark.addressDictionary;
                   NSLog(@"%@ ", addressDictionary);
                   NSString *address = [addressDictionary
                                      objectForKey:(NSString *)kABPersonAddressStreetKey];
                   NSString *city = [addressDictionary
                                     objectForKey:(NSString *)kABPersonAddressCityKey];
                   NSString *state = [addressDictionary
                                      objectForKey:(NSString *)kABPersonAddressStateKey];
                   NSString *zip = [addressDictionary
                                    objectForKey:(NSString *)kABPersonAddressZIPKey];
                  NSLog(@"%@ %@ %@ %@", address,city, state, zip);
                   //NSLog(fullA);
                   fullA=(@"%@ %@ %@ %@", address,city, state, zip);
                 }
               }];
  [messageController setBody:fullA];
  [self presentModalViewController:messageController animated:YES];
  }
  else {
    NSLog(@"%@" , @"Sorry, you need to setup mail first!");
  }
}  

我已经尝试使用__block，或者所有我能找到的在线教程。

这将在NSLog中打印完整的地址。然而，无论我尝试了什么，这都不会显示[messageController setBody:(@"%@ %@ %@ %@",city, state, address, zip)];

和使用(setBody:@"Hello")工作得很好…

我确信我可以做一些小事情来解决这个问题，但是我所尝试的一切都失败了。任何想法都很棒!

Answer 1

你不能用你现在的方式做你正在做的事。对reverseGeocodeLocation的调用是异步的。在返回地址信息之前很久，您就会显示消息控制器。这就是为什么body总是空的原因。

您需要修改代码以在完成处理程序中创建和显示消息编写器(但是您必须在主队列上分派代码)。

- (IBAction)SendTextTapped:(id)sender{
    if ([MFMessageComposeViewController canSendText]) {
        CLGeocoder *geocoder = [[CLGeocoder alloc] init];
        CLLocation *newerLocation = [[CLLocation alloc]initWithLatitude:21.1700 longitude:72.8300];
        [geocoder reverseGeocodeLocation:newerLocation completionHandler:^(NSArray *placemarks, NSError *error) {
            if (error) {
                NSLog(@"Geocode failed with error: %@", error);
                return;
            }
            NSString *body = @"";
            if (placemarks && placemarks.count > 0) {
                CLPlacemark *placemark = placemarks[0];
                NSDictionary *addressDictionary =
                placemark.addressDictionary;
                NSLog(@"%@ ", addressDictionary);
                NSString *address = [addressDictionary
                                   objectForKey:(NSString *)kABPersonAddressStreetKey];
                NSString *city = [addressDictionary
                                   objectForKey:(NSString *)kABPersonAddressCityKey];
                NSString *state = [addressDictionary
                                   objectForKey:(NSString *)kABPersonAddressStateKey];
                NSString *zip = [addressDictionary
                                   objectForKey:(NSString *)kABPersonAddressZIPKey];
                NSLog(@"%@ %@ %@ %@", address,city, state, zip);
                //NSLog(fullA);
                body = [NSString stringWithFormat:@"%@ %@ %@ %@", address,city, state, zip];
            }
            dispatch_async(dispatch_get_main_queue(), ^{
                MFMessageComposeViewController* messageController = [[MFMessageComposeViewController alloc] init];
                messageController.messageComposeDelegate = self;
                [messageController setBody:body];
                [self presentModalViewController:messageController animated:YES];
            });
        }];
    } else {
        NSLog(@"%@" , @"Sorry, you need to setup mail first!");
    }
}

Answer 2

使用stringWithFormat来设置不同对象的body，如下所示

[messageController setBody:[NSString stringWithFormat:@"%@ %@ %@ %@",city, state, address, zip];