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我的应用程序中有一个按钮，当按下它时，将显示一个 MFMailComposerViewController，当作曲家关闭时，将显示一个带有自定义视图的 MBProgressHUD 来告诉用户邮件是否发送成功。

如果我按下作曲家中的发送按钮，它会正常工作，邮件将被发送，作曲家将被解雇并显示 HUD。但是，如果我在作曲家视图中按下取消按钮，作曲家将关闭，但 HUD 不显示，并且应用程序崩溃。

这是崩溃日志。

2012-02-02 22:49:34.821 App[5091:707] -[ViewController size]: unrecognized selector 
sent to instance 0x319210
2012-02-02 22:49:34.831 App[5091:707] *** Terminating app due to uncaught exception 
'NSInvalidArgumentException', reason: '-[ViewController size]: unrecognized selector sent to instance 0x319210'
*** First throw call stack:
(0x340af8bf 0x342ff1e5 0x340b2acb 0x340b1945 0x340b27b8 
0x3748cfa5 0xf051 0x203d1 0x37553f5b 0x374f393b 0x374f37bf 
0x3746d81b 0x37472fb9 0x34bc4ba7 0x36ce3e8d 0x340822dd 
0x340054dd 0x340053a5 0x30889fcd 0x37486743 0xe7a7 0xe74c)
terminate called throwing an exception

ViewController是呈现邮件编写器的控制器。

这是我使用的一些代码：

-(void)showHUDWithMessage:(NSString *)msg
{
HUD = [[MBProgressHUD alloc]initWithWindow:self.window];
[self.window addSubview:HUD];
HUD.delegate = self;
UIImage *image;
NSString *labelTextToShow;

//Do something here

UIImageView *imageView = [[[UIImageView alloc]initWithImage:image]autorelease];

HUD.labelText = labelTextToShow;
HUD.customView = imageView;

HUD.mode = MBProgressHUDModeCustomView;
[HUD show:YES];
[HUD hide:YES afterDelay:3.0];
}

-(void)mailFriend:(id)sender
{
MFMailComposeViewController *mailController = [[MFMailComposeViewController alloc]init];
mailController.mailComposeDelegate = self;

[mailController setSubject:@"Mail Subject"];

NSString *emailBody = @"Message";
[mailController setMessageBody:emailBody isHTML:YES];

[self presentModalViewController:mailController animated:YES];
}

-(void)mailComposeController:(MFMailComposeViewController *)controller 
    didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
NSString *msg;
switch (result) {
    case MFMailComposeResultSent:
        msg = @"Sent";
        break;
    case MFMailComposeResultFailed:
        msg = @"Fail";
        break;
    case MFMailComposeResultCancelled:
        msg = @"Cancelled";
        break;
    case MFMailComposeResultSaved:
        msg = @"Cancelled";
        break;
    default:
        break;
}

//Show HUD here
[self showHUDWithMessage:msg];
[self dismissModalViewControllerAnimated:YES];
[controller release];

}

既然发送了邮件，composer view可以成功dismiss，HUD也可以正确显示，真不知道这里是怎么回事……

谢谢！

4

2 回答 2

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这很可能是过度释放内存问题。启用 NSZombie 并测试您的应用程序。

几件事：您在哪里创建了控制器？您有责任释放您拥有的对象。你不拥有控制器对象，所以不要释放它：

[controller release]; // comment this line

在
-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error

下一个：

-(void)mailComposeController:(MFMailComposeViewController *)controller 
    didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
NSString *msg = nil; // If result is not equal to any of the case statements then you want to pass nil to [self showHUDWithMessage:msg];
switch (result) {
    case MFMailComposeResultSent:
        msg = @"Sent";
        break;
    case MFMailComposeResultFailed:
        msg = @"Fail";
        break;
    case MFMailComposeResultCancelled:
        msg = @"Cancelled";
        break;
    case MFMailComposeResultSaved:
        msg = @"Cancelled";
        break;
    default:
        break;
}

//Show HUD here
[self showHUDWithMessage:msg];
[self dismissModalViewControllerAnimated:YES];
[controller release];

}

并MFMailComposeViewController *mailController = [[MFMailComposeViewController alloc]init];在-(void)mailFriend:(id)sender自动释放或稍后释放。尽管这与您可能遇到的问题无关。

于 2012-02-03T04:22:29.310 回答
0

删除所有对 MBProgressHUD 的引用，并在您的方法中放置一个简单的 NSLog。我敢打赌，我的最低美元 MB 是造成这种情况的原因。

如果没有，内存管理显然是我的第二选择。注释掉[控制器发布]；

于 2012-02-03T04:47:48.437 回答