分配到 'ID <MFMessageComposeViewControllerDelegate>' 從不兼容的類型 'MainViewController *'

Question

我在我的代碼下面的警告（4.3的XCode/iOS的4/5） -

分配到從不兼容的類型的 'id'「MainViewController *」

警告本節提出 -

- (IBAction)sendInAppSMS:(id)sender 
{ 
MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease]; 
if([MFMessageComposeViewController canSendText]) 
{ 
    controller.body = @"A test message from http://www.macoscoders.com"; 
    controller.recipients = [NSArray arrayWithObjects:@"9880182343",nil]; 
    controller.messageComposeDelegate = self; 
    [self presentModalViewController:controller animated:YES]; 
} 
} 

特別是這一行 -

controller.messageComposeDelegate = self; 

對於我的代碼有什麼問題感到困惑。谷歌搜索的警告我發現了一些參考，但我很難理解答案。

任何指針/解釋將不勝感激。

問候

搶

我的完整的.h文件中 -

#import <UIKit/UIKit.h> 
#import <AVFoundation/AVFoundation.h> 
#import <AudioToolbox/AudioToolbox.h> 
#import <MessageUI/MessageUI.h> 
#import "EasyTracker.h" 

@interface MainViewController : TrackedUIViewController <MFMailComposeViewControllerDelegate> { 

IBOutlet UIView *volumeSlider; 
AVPlayer *radiosound; 

IBOutlet UIButton *playpausebutton; 

IBOutlet UIActivityIndicatorView *activityIndicator; 
NSTimer *timer; 

} 

@property(nonatomic, retain) AVPlayer     *radiosound; 
@property(nonatomic, retain) UIButton     *playpausebutton; 

- (void)updatebuttonstatus; 

- (void)playCurrentTrack; 
- (void)pauseCurrentTrack; 
- (IBAction)playbutton; 
- (IBAction)openMail:(id)sender; 
- (IBAction)sendInAppSMS:(id)sender; 

@end 

從我的.m文件亮點 -

#import "MainViewController.h" 
#import <AVFoundation/AVFoundation.h> 
#import <AudioToolbox/AudioToolbox.h> 
#import <MediaPlayer/MediaPlayer.h> 
#import "radio99AppDelegate.h" 

@implementation MainViewController 



- (IBAction)sendInAppSMS:(id)sender 
{ 
MFMessageComposeViewController *controller = [[[MFMessageComposeViewController alloc] init] autorelease]; 
if([MFMessageComposeViewController canSendText]) 
{ 
    controller.body = @"A test message from http://www.macoscoders.com"; 
    controller.recipients = [NSArray arrayWithObjects:@"9880182343",nil]; 
    controller.messageComposeDelegate = self; 
    [self presentModalViewController:controller animated:YES]; 
} 
} 

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result 
{ 
switch (result) { 
    case MessageComposeResultCancelled: 
    { 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"SMSTester" message:@"User cancelled sending the SMS" 
                 delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
     [alert show]; 
     [alert release]; 
    } 
     break; 
    case MessageComposeResultFailed: 
    { 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"SMSTester" message:@"Error occured while sending the SMS" 
                 delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
     [alert show]; 
     [alert release]; 
    } 
     break; 
    case MessageComposeResultSent: 
    { 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"SMSTester" message:@"SMS sent successfully..!" 
                 delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
     [alert show]; 
     [alert release]; 
    } 
     break; 
    default: 
     break; 
} 

[self dismissModalViewControllerAnimated:YES]; 
} 

- (IBAction)openMail:(id)sender 
{ 
if ([MFMailComposeViewController canSendMail]) 
{ 
    MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init]; 

    mailer.mailComposeDelegate = self; 

    [mailer setSubject:@"A Message from MobileTuts+"]; 

    NSArray *toRecipients = [NSArray arrayWithObjects:@"fisrtMail@example.com", @"secondMail@example.com", nil]; 
    [mailer setToRecipients:toRecipients]; 

    UIImage *myImage = [UIImage imageNamed:@"mobiletuts-logo.png"]; 
    NSData *imageData = UIImagePNGRepresentation(myImage); 
    [mailer addAttachmentData:imageData mimeType:@"image/png" fileName:@"mobiletutsImage"]; 

    NSString *emailBody = @"Have you seen the MobileTuts+ web site?"; 
    [mailer setMessageBody:emailBody isHTML:NO]; 

    [self presentModalViewController:mailer animated:YES]; 

    [mailer release]; 
} 
else 
{ 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure" 
                message:@"Your device doesn't support the composer sheet" 
                delegate:nil 
              cancelButtonTitle:@"OK" 
              otherButtonTitles: nil]; 
    [alert show]; 
    [alert release]; 
} 

} 

#pragma mark - MFMailComposeController delegate 

- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error 
{ 
switch (result) 
{ 
    case MFMailComposeResultCancelled: 
     NSLog(@"Mail cancelled: you cancelled the operation and no email message was queued"); 
     break; 
    case MFMailComposeResultSaved: 
     NSLog(@"Mail saved: you saved the email message in the Drafts folder"); 
     break; 
    case MFMailComposeResultSent: 
     NSLog(@"Mail send: the email message is queued in the outbox. It is ready to send the next time the user connects to email"); 
     break; 
    case MFMailComposeResultFailed: 
     NSLog(@"Mail failed: the email message was nog saved or queued, possibly due to an error"); 
     break; 
    default: 
     NSLog(@"Mail not sent"); 
     break; 
} 

[self dismissModalViewControllerAnimated:YES]; 
} 

@end 

Answer 1

您正在使用：

MFMailComposeViewControllerDelegate 

，它應該是：

MFMessageComposeViewControllerDelegate 

更改位置：

@interface MainViewController : TrackedUIViewController <MFMessageComposeViewControllerDelegate> { 

Answer 2

沒有與此庫的工作，但我所看到的，YOUE MainViewController是MF * 郵件 * ComposeViewControllerDelegate ，但是將其設置爲MF * 消息 * ComposeViewControllerDelegate。

Answer 3

在頭文件中實現UINavigationControllerDelegate。