iOS“控制可能到达非空函数结束”

-1

任何想法为什么我得到“控制可能到达非空函数结束”以下代码的2个错误？我曾在一个单独的应用程序工作，但由于某种原因现在提出这个错误。iOS“控制可能到达非空函数结束”

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 

    switch (pickerView.tag) { 
     case kCATEGORYTYPEPICKERTAG: 
      return [categoryTypes count];; 
      break; 
     case kLOCATIONTYPEPICKERTAG: 
      return [locationTypes count]; 
      break; 
     case kORIGINATORTYPEPICKERTAG: 
      return [originatorTypes count]; 
      break; 
     case kDESTINATIONTYPEPICKERTAG: 
      return [destinationTypes count]; 
      break; 
     case kSTATUSTYPEPICKERTAG: 
      return [statusTypes count]; 
      break; 
     default: 
      break; 
    } 

} 



- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    switch (pickerView.tag) { 
     case kCATEGORYTYPEPICKERTAG: 
      return [categoryTypes objectAtIndex:row]; 
      break; 
     case kLOCATIONTYPEPICKERTAG: 
      return [locationTypes objectAtIndex:row]; 
      break; 
     case kORIGINATORTYPEPICKERTAG: 
      return [originatorTypes objectAtIndex:row]; 
      break; 
     case kDESTINATIONTYPEPICKERTAG: 
      return [destinationTypes objectAtIndex:row]; 
      break; 
     case kSTATUSTYPEPICKERTAG: 
      return [statusTypes objectAtIndex:row]; 
      break; 
     default: 
      break; 
    } 
}

非常感谢

UPDATE

全码：

@synthesize nameTextField, emailTextField, dateTextField, timeTextField, blankTextField, blankbTextField, mlabelcategory, messageTextView; 
@synthesize name, emailaddress, date, time, blank, blankb, category, message; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
     categoryTypes = [[NSArray alloc] initWithObjects:@"Appetizers",@"Breakfast",@"Dessert",@"Drinks", 
         @"Main Dish/Entree", @"Salad", @"Side Dish", @"Soup", @"Snack", 
         @"Baby Food", @"Pet Food",nil]; 

     locationTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue", 
         @"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken", 
         @"Chinese", @"Cuban", 
         @"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers", 
         @"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican", 
         @"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani", 
         @"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian", 
         @"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food", 
         @"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai", 
         @"Vietnamese",@"Wild Game",nil]; 

     originatorTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue", 
          @"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken", 
          @"Chinese", @"Cuban", 
          @"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers", 
          @"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican", 
          @"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani", 
          @"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian", 
          @"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food", 
          @"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai", 
          @"Vietnamese",@"Wild Game",nil]; 


     destinationTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue", 
          @"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken", 
          @"Chinese", @"Cuban", 
          @"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers", 
          @"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican", 
          @"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani", 
          @"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian", 
          @"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food", 
          @"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai", 
          @"Vietnamese",@"Wild Game",nil]; 


     statusTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue", 
         @"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken", 
         @"Chinese", @"Cuban", 
         @"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers", 
         @"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican", 
         @"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani", 
         @"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian", 
         @"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food", 
         @"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai", 
         @"Vietnamese",@"Wild Game",nil]; 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 



    nameTextField.text = nil; 
    emailTextField.text = nil; 
    dateTextField.text = nil; 
    timeTextField.text = nil; 
    blankTextField.text = nil; 
    blankbTextField.text = nil; 
    mlabelcategory.text = nil; 
    messageTextView.text = nil; 

    categoryTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(300,400,400,160)]; 
    categoryTypePicker.tag = kCATEGORYTYPEPICKERTAG; 
    categoryTypePicker.showsSelectionIndicator = TRUE; 
    categoryTypePicker.dataSource = self; 
    categoryTypePicker.delegate = self; 
    categoryTypePicker.hidden = YES; 
    locationTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)]; 
    locationTypePicker.backgroundColor = [UIColor blueColor]; 
    locationTypePicker.tag = kLOCATIONTYPEPICKERTAG; 
    locationTypePicker.showsSelectionIndicator = TRUE; 
    locationTypePicker.hidden = YES; 
    locationTypePicker.dataSource = self; 
    locationTypePicker.delegate = self; 
    originatorTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)]; 
    originatorTypePicker.backgroundColor = [UIColor blueColor]; 
    originatorTypePicker.tag = kORIGINATORTYPEPICKERTAG; 
    originatorTypePicker.showsSelectionIndicator = TRUE; 
    originatorTypePicker.hidden = YES; 
    originatorTypePicker.dataSource = self; 
    originatorTypePicker.delegate = self; 
    destinationTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)]; 
    destinationTypePicker.backgroundColor = [UIColor blueColor]; 
    destinationTypePicker.tag = kDESTINATIONTYPEPICKERTAG; 
    destinationTypePicker.showsSelectionIndicator = TRUE; 
    destinationTypePicker.hidden = YES; 
    destinationTypePicker.dataSource = self; 
    destinationTypePicker.delegate = self; 
    statusTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)]; 
    statusTypePicker.backgroundColor = [UIColor blueColor]; 
    statusTypePicker.tag = kSTATUSTYPEPICKERTAG; 
    statusTypePicker.showsSelectionIndicator = TRUE; 
    statusTypePicker.hidden = YES; 
    statusTypePicker.dataSource = self; 
    statusTypePicker.delegate = self; 
} 


/* 
// Override to allow orientations other than the default portrait orientation. 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
// Return YES for supported orientations. 
return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 
*/ 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)eve 
{ 

    if (!locationTypePicker.hidden) { 
     locationTypePicker.hidden = YES; 
    } 
    if (!categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = YES; 
    } 
    if (!originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = YES; 
    } 
    if (!destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = YES; 
    } 
    if (!statusTypePicker.hidden) { 
     statusTypePicker.hidden = YES; 
    } 

} 

#pragma mark - 
#pragma mark picker methods 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
    return kPICKERCOLUMN; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 

    switch (pickerView.tag) { 
     case kCATEGORYTYPEPICKERTAG: 
      return [categoryTypes count];; 
      break; 
     case kLOCATIONTYPEPICKERTAG: 
      return [locationTypes count]; 
      break; 
     case kORIGINATORTYPEPICKERTAG: 
      return [originatorTypes count]; 
      break; 
     case kDESTINATIONTYPEPICKERTAG: 
      return [destinationTypes count]; 
      break; 
     case kSTATUSTYPEPICKERTAG: 
      return [statusTypes count]; 
      break; 
     default: return nil; break; 
    } 

} 



- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    switch (pickerView.tag) { 
     case kCATEGORYTYPEPICKERTAG: 
      return [categoryTypes objectAtIndex:row]; 
      break; 
     case kLOCATIONTYPEPICKERTAG: 
      return [locationTypes objectAtIndex:row]; 
      break; 
     case kORIGINATORTYPEPICKERTAG: 
      return [originatorTypes objectAtIndex:row]; 
      break; 
     case kDESTINATIONTYPEPICKERTAG: 
      return [destinationTypes objectAtIndex:row]; 
      break; 
     case kSTATUSTYPEPICKERTAG: 
      return [statusTypes objectAtIndex:row]; 
      break; 
     default: return nil; break; 

    } 
} 




- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
    if (pickerView.tag == kCATEGORYTYPEPICKERTAG) { 
     NSString *categoryType = [categoryTypes objectAtIndex:[pickerView selectedRowInComponent:0]]; 
     [categoryTypeBtn setTitle:categoryType forState:UIControlStateNormal]; 

    }else if (pickerView.tag == kLOCATIONTYPEPICKERTAG) { 

     NSString *locationType = [locationTypes objectAtIndex:[pickerView selectedRowInComponent:0]]; 
     [locationTypeBtn setTitle:locationType forState:UIControlStateNormal]; 

    }else if (pickerView.tag == kORIGINATORTYPEPICKERTAG) { 

     NSString *originatorType = [originatorTypes objectAtIndex:[pickerView selectedRowInComponent:0]]; 
     [originatorTypeBtn setTitle:originatorType forState:UIControlStateNormal]; 

    }else if (pickerView.tag == kDESTINATIONTYPEPICKERTAG) { 

     NSString *destinationType = [destinationTypes objectAtIndex:[pickerView selectedRowInComponent:0]]; 
     [destinationTypeBtn setTitle:destinationType forState:UIControlStateNormal]; 

    }else if (pickerView.tag == kSTATUSTYPEPICKERTAG) { 

     NSString *statusType = [statusTypes objectAtIndex:[pickerView selectedRowInComponent:0]]; 
     [statusTypeBtn setTitle:statusType forState:UIControlStateNormal]; 

    } 

} 
-(IBAction) showLocationTypePicker{ 
    if (locationTypePicker.hidden) { 
     locationTypePicker.hidden = NO; 
     [self.view addSubview:locationTypePicker]; 
    } 
    else { 
     locationTypePicker.hidden = NO; 
     [locationTypePicker removeFromSuperview]; 
    } 

    if (categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = YES; 
     [self.view addSubview:categoryTypePicker]; 
    } 
    else { 
     categoryTypePicker.hidden = YES; 
     [categoryTypePicker removeFromSuperview]; 
    } 
    if (originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = YES; 
     [self.view addSubview:originatorTypePicker]; 
    } 
    else { 
     originatorTypePicker.hidden = YES; 
     [originatorTypePicker removeFromSuperview]; 
    } 
    if (destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = YES; 
     [self.view addSubview:destinationTypePicker]; 
    } 
    else { 
     destinationTypePicker.hidden = YES; 
     [destinationTypePicker removeFromSuperview]; 
    } 
    if (statusTypePicker.hidden) { 
     statusTypePicker.hidden = YES; 
     [self.view addSubview:statusTypePicker]; 
    } 
    else { 
     statusTypePicker.hidden = YES; 
     [statusTypePicker removeFromSuperview]; 
    } 



} 
-(IBAction) showCategoryTypePicker{ 
    if (categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = NO; 
     [self.view addSubview:categoryTypePicker]; 
    } 
    else { 
     categoryTypePicker.hidden = NO; 
     [categoryTypePicker removeFromSuperview]; 
    } 
    if (locationTypePicker.hidden) { 
     locationTypePicker.hidden = YES; 
     [self.view addSubview:locationTypePicker]; 
    } 
    else { 
     locationTypePicker.hidden = YES; 
     [locationTypePicker removeFromSuperview]; 
    } 
    if (originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = YES; 
     [self.view addSubview:originatorTypePicker]; 
    } 
    else { 
     originatorTypePicker.hidden = YES; 
     [originatorTypePicker removeFromSuperview]; 
    } 
    if (destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = YES; 
     [self.view addSubview:destinationTypePicker]; 
    } 
    else { 
     destinationTypePicker.hidden = YES; 
     [destinationTypePicker removeFromSuperview]; 
    } 
    if (statusTypePicker.hidden) { 
     statusTypePicker.hidden = YES; 
     [self.view addSubview:statusTypePicker]; 
    } 
    else { 
     statusTypePicker.hidden = YES; 
     [statusTypePicker removeFromSuperview]; 
    } 
} 

-(IBAction) showOriginatorTypePicker{ 
    if (originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = NO; 
     [self.view addSubview:originatorTypePicker]; 
    } 
    else { 
     originatorTypePicker.hidden = NO; 
     [originatorTypePicker removeFromSuperview]; 
    } 
    if (locationTypePicker.hidden) { 
     locationTypePicker.hidden = YES; 
     [self.view addSubview:locationTypePicker]; 
    } 
    else { 
     locationTypePicker.hidden = YES; 
     [locationTypePicker removeFromSuperview]; 
    } 
    if (categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = YES; 
     [self.view addSubview:categoryTypePicker]; 
    } 
    else { 
     categoryTypePicker.hidden = YES; 
     [categoryTypePicker removeFromSuperview]; 
    } 
    if (destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = YES; 
     [self.view addSubview:destinationTypePicker]; 
    } 
    else { 
     destinationTypePicker.hidden = YES; 
     [destinationTypePicker removeFromSuperview]; 
    } 
    if (statusTypePicker.hidden) { 
     statusTypePicker.hidden = YES; 
     [self.view addSubview:statusTypePicker]; 
    } 
    else { 
     statusTypePicker.hidden = YES; 
     [statusTypePicker removeFromSuperview]; 
    } 
} 

-(IBAction) showDestinationTypePicker{ 
    if (destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = NO; 
     [self.view addSubview:destinationTypePicker]; 
    } 
    else { 
     destinationTypePicker.hidden = NO; 
     [destinationTypePicker removeFromSuperview]; 
    } 

    if (locationTypePicker.hidden) { 
     locationTypePicker.hidden = YES; 
     [self.view addSubview:locationTypePicker]; 
    } 
    else { 
     locationTypePicker.hidden = YES; 
     [locationTypePicker removeFromSuperview]; 
    } 
    if (originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = YES; 
     [self.view addSubview:originatorTypePicker]; 
    } 
    else { 
     originatorTypePicker.hidden = YES; 
     [originatorTypePicker removeFromSuperview]; 
    } 
    if (categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = YES; 
     [self.view addSubview:categoryTypePicker]; 
    } 
    else { 
     categoryTypePicker.hidden = YES; 
     [categoryTypePicker removeFromSuperview]; 
    } 
    if (statusTypePicker.hidden) { 
     statusTypePicker.hidden = YES; 
     [self.view addSubview:statusTypePicker]; 
    } 
    else { 
     statusTypePicker.hidden = YES; 
     [statusTypePicker removeFromSuperview]; 
    } 

} 

-(IBAction) showStatusTypePicker{ 
    if (statusTypePicker.hidden) { 
     statusTypePicker.hidden = NO; 
     [self.view addSubview:statusTypePicker]; 
    } 
    else { 
     statusTypePicker.hidden = NO; 
     [statusTypePicker removeFromSuperview]; 
    } 
    if (locationTypePicker.hidden) { 
     locationTypePicker.hidden = YES; 
     [self.view addSubview:locationTypePicker]; 
    } 
    else { 
     locationTypePicker.hidden = YES; 
     [locationTypePicker removeFromSuperview]; 
    } 
    if (originatorTypePicker.hidden) { 
     originatorTypePicker.hidden = YES; 
     [self.view addSubview:originatorTypePicker]; 
    } 
    else { 
     originatorTypePicker.hidden = YES; 
     [originatorTypePicker removeFromSuperview]; 
    } 
    if (destinationTypePicker.hidden) { 
     destinationTypePicker.hidden = YES; 
     [self.view addSubview:destinationTypePicker]; 
    } 
    else { 
     destinationTypePicker.hidden = YES; 
     [destinationTypePicker removeFromSuperview]; 
    } 
    if (categoryTypePicker.hidden) { 
     categoryTypePicker.hidden = YES; 
     [self.view addSubview:categoryTypePicker]; 
    } 
    else { 
     categoryTypePicker.hidden = YES; 
     [categoryTypePicker removeFromSuperview]; 
    } 


} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

- (NSUInteger)supportedInterfaceOrientations { 
    return UIInterfaceOrientationMaskPortrait; 
} 

#pragma - getting info from the UI 

//NSString *test = nil; 


- (IBAction)checkData:(id)sender 
{ 
    /* 
    name = nameTextField.text; 
    surname = surnameTextField.text; 
    bornDate = bornDateTextField.text; 
    address = addressTextField.text; 
    zipCode = zipTextField.text; 
    email = emailTextField.text; 
    */ 

    //NSLog(@" Name: %@ \n Surname: %@ \n Date of Birth: %@ \n Address: %@ \n Post Code: %@ \n email: %@ \n", name, surname, bornDate, address, zipCode, email); 

    unsigned int x,a = 0; 
    NSMutableString *emailmessage; //stringa variabile 
    emailmessage = [NSMutableString stringWithFormat: @""]; //le stringhe mutabili vanno inizializzate in questo modo! 


    for (x=0; x<7; x++) 
    { 
     switch (x) { 
      case 0: 
       if (nameTextField.text == nil) { 
        [emailmessage appendString:@"Name, "]; 
        a=1; 

       } 
       break; 

      case 1: 
       if (emailTextField.text == nil) 
       { 
        [emailmessage appendString:@"Email Address, "]; 
        a=1; 
       } 
       break; 

      case 2: 
       if (dateTextField.text == nil) 
       { 
        [emailmessage appendString:@"Date of Near Miss, "]; 
        a=1; 
       } 
       break; 

      case 3: 
       if (timeTextField.text == nil) 
       { 
        [emailmessage appendString:@"Time of Near Miss, "]; 
        a=1; 
       } 
       break; 

      case 4: 
       if (blankTextField.text == nil) 
       { 
        [emailmessage appendString:@"Post Code, "]; 
        a=1; 
       } 
       break; 

      case 5: 
       if (blankbTextField.text == nil) 
       { 
        [emailmessage appendString:@"Email, "]; 
        a=1; 
       } 
       break; 

      case 6: 
       if (mlabelcategory.text == nil) 
       { 
        [emailmessage appendString:@"Category, "]; 
        a=1; 
       } 
       break; 
      case 7: 
       if (messageTextView.text == nil) 
       { 
        [emailmessage appendString:@"Observation Description, "]; 
        a=1; 
       } 
       break; 

      default: 
       break; 
     } 

    } 

    NSLog (@"Email Message: %@", emailmessage); 

    if (a == 1) { 

     NSMutableString *popupError; 
     popupError = [NSMutableString stringWithFormat: @"Per inviare compilare i seguenti campi: "]; 

     [popupError appendString:emailmessage]; //aggiungo i miei errori 
     [popupError appendString: @" grazie della comprensione."]; // 

     NSLog(@"%@", popupError); 

     UIAlertView *chiamataEffettuata = [[UIAlertView alloc] 
              initWithTitle:@"ATTENTION" //titolo del mio foglio 
              message:popupError 
              delegate:self 
              cancelButtonTitle:@"Ok, correggo" //bottone con cui si chiude il messaggio 
              otherButtonTitles:nil, nil]; 
     [chiamataEffettuata show]; //istanza per mostrare effettivamente il messaggio 
    } 

    else 
    { 
     name = nameTextField.text; 
     emailaddress = emailTextField.text; 
     date = dateTextField.text; 
     time = timeTextField.text; 
     blank = blankTextField.text; 
     blankb = blankbTextField.text; 
     category = mlabelcategory.text; 
     message = messageTextView.text; 

     NSMutableString *nearmissreport; 
     nearmissreport = [NSMutableString stringWithFormat: @"<br><br> <b>Name:</b> %@ <br> <b>Email Address:</b> %@ <br> <b>Date of Near Miss:</b> %@ <br> <b>Time of Near Miss:</b> %@ <br> <b>Post Code:</b> %@ <br> <b>Email Address:</b> %@ <br> <b>Category:</b> %@ <br><b>Observation Description:</b> %@ <br>", name, emailaddress, date, time, blank, blankb, category, message]; 

     NSLog(@"Near Miss Report: %@", nearmissreport); 

     NSMutableString *testoMail; 
     testoMail = [NSMutableString stringWithFormat: nearmissreport]; 

     NSLog(@"%@", testoMail); 


     //MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; 
     MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; 
     picker.mailComposeDelegate = self; 

     [picker setSubject: name]; 

     // Set up the recipients. 
     NSArray *toRecipients = [NSArray arrayWithObjects:@"[email protected]",nil]; 

     //NSArray *ccRecipients = [NSArray arrayWithObjects:@"[email protected]",@"[email protected]", nil]; 
     //NSArray *bccRecipients = [NSArray arrayWithObjects:@"[email protected]",nil]; 

     [picker setToRecipients:toRecipients]; 
     //[picker setCcRecipients:ccRecipients]; 
     //[picker setBccRecipients:bccRecipients]; 

     // Attach an image to the email. 
     //NSString *path = [[NSBundle mainBundle] pathForResource:@"ipodnano" ofType:@"png"]; 
     //NSData *myData = [NSData dataWithContentsOfFile:path]; 
     //[picker addAttachmentData:myData mimeType:@"image/png" fileName:@"ipodnano"]; 

     // Fill out the email body text. 
     //NSMutableString *emailBody; 
     testoMail = [NSMutableString stringWithFormat: @"%@", testoMail]; 

     [picker setMessageBody:testoMail isHTML:YES]; //HTML!!!!!! 

     // Present the mail composition interface. 
     [self presentViewController:picker animated:YES completion:nil]; 
    } 
} 


// The mail compose view controller delegate method 
- (void)mailComposeController:(MFMailComposeViewController *)controller 
didFinishWithResult:(MFMailComposeResult)result 
error:(NSError *)error 
{ 
    [self dismissModalViewControllerAnimated:YES]; 
} 

#pragma mark - Mandare email 
/* 
- (void)sendMail:(NSMutableString*)testoMail{ 

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; 
picker.mailComposeDelegate = self; 

[picker setSubject:@"Reclutamento pompieri"]; 

// Set up the recipients. 
NSArray *toRecipients = [NSArray arrayWithObjects:@"[email protected]",nil]; 
//NSArray *ccRecipients = [NSArray arrayWithObjects:@"[email protected]",@"[email protected]", nil]; 
//NSArray *bccRecipients = [NSArray arrayWithObjects:@"[email protected]",nil]; 

[picker setToRecipients:toRecipients]; 
//[picker setCcRecipients:ccRecipients]; 
//[picker setBccRecipients:bccRecipients]; 

// Attach an image to the email. 
//NSString *path = [[NSBundle mainBundle] pathForResource:@"ipodnano" ofType:@"png"]; 
//NSData *myData = [NSData dataWithContentsOfFile:path]; 
//[picker addAttachmentData:myData mimeType:@"image/png" fileName:@"ipodnano"]; 

// Fill out the email body text. 
NSString *emailBody = @"It is raining in sunny California!"; 
[picker setMessageBody:emailBody isHTML:NO]; 

// Present the mail composition interface. 
[self presentViewController:picker animated:YES completion:nil]; 


} 
*/ 



#pragma mark - methods to control the keyboard 

- (IBAction)backgroundTap:(id)sender //method for resign the keyboard when the background is tapped 
{ 
    [nameTextField resignFirstResponder]; 
    [emailTextField resignFirstResponder]; 
    [dateTextField resignFirstResponder]; 
    [timeTextField resignFirstResponder]; 
    [blankTextField resignFirstResponder]; 
    [blankbTextField resignFirstResponder]; 
    [mlabelcategory resignFirstResponder]; 
    [messageTextView resignFirstResponder]; 

} 

- (IBAction)doneButtonPressed:(id)sender 
{ 
    NSLog(@"done button pressed"); 
    [sender resignFirstResponder]; 
}

来源

2014-06-22 PaulH

缺少默认退货..开关外侧 – gro

请原谅我的无知，我会在哪里放置默认退货？ – PaulH

尝试...默认值：返回0; 休息; } ...或者你需要的任何默认值，而不是0 – gro

这是因为如果你标记属性不属于任何的情况下，它会到default块，这反过来将不会返回任何东西。

您需要在默认块返回默认值（nil，0）：

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    NSInteger numberOfRows = 0; 
    switch (pickerView.tag) { 
     case kCATEGORYTYPEPICKERTAG: { 
      numberOfRows = [categoryTypes count]; 
      break; 
     } 
     case kLOCATIONTYPEPICKERTAG: { 
      numberOfRows = [locationTypes count]; 
      break; 
     } 
     case kORIGINATORTYPEPICKERTAG: { 
      numberOfRows = [originatorTypes count]; 
      break; 
     } 
     case kDESTINATIONTYPEPICKERTAG: { 
      numberOfRows = [destinationTypes count]; 
      break; 
     } 
     case kSTATUSTYPEPICKERTAG: { 
      numberOfRows = [statusTypes count]; 
      break; 
     } 
     default: { 
      break; 
     } 
    } 
    return numberOfRows; 
}

你也必须这样做，在titleForRow方法。

另外：

我更喜欢具有returns最小量和修改值代替我将在末端
在{}围的情况下返回。

来源

2014-06-22 14:39:33

iOS“控制可能到达非空函数结束”

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