是否有可能以某种方式锁定 MFMailComposeViewController 中的字段，以便用户无法更改正文、收件人等？我需要用户发送的电子邮件转到特定帐户和正文以满足特定标准，因此如果用户彻底编辑格式，一切都可能会出现可怕的错误..目前正文是根据用户的数据填写的在前一个 View 中输入文本字段和日期选择器。

基本上我认为锁定字段比显示警告或“请不要编辑消息”更专业，所以如果不能锁定字段也不是什么大问题，但我们将不胜感激。

最佳答案

从下面的链接下载框架。然后我将一些代码放在一起，发送带有漂亮“请稍候”覆盖的电子邮件。我附上了它运行时的样子的图像(只需要几秒钟)。请注意，创建 SMTP 框架不归功于我。它是在永远搜索它之后从互联网上下载的。 您可以下载的 zip 文件包含我为用户反馈创建的叠加图像。它同时具有@2x 和常规。您将必须进入界面生成器并创建标签，尽管上面写着“发送试驾……”。它已经在代码中，但我没有从代码中添加它。所以你必须在 IB 中添加它。

1. 确保添加你的框架 下载到你的项目。

2.确保将 CFNetwork 框架添加到您的项目中

3. 确保附加 UILabel 名称 界面生成器中的“loadingLabel”

4. 用户名和密码 代码指的是一个smtp 服务器。如果你没有一个创建 gmail 帐户并使用 gmail 设置。如果你不熟悉 使用 gmail 设置谷歌“gmail smtp"你会找到你需要的。

Find Framework & Art here

对于您的 .h 文件，确保包括:

//for sending email alert
UIActivityIndicatorView * spinner;
UIImageView * bgimage;
IBOutlet UILabel * loadingLabel;

}
@property (nonatomic, retain)IBOutlet UILabel * loadingLabel;
@property (nonatomic, retain)UIImageView * bgimage;
@property (nonatomic, retain)UIActivityIndicatorView * spinner;
-(void)sendEmail;
-(void)removeWaitOverlay;
-(void)createWaitOverlay;
-(void)stopSpinner;
-(void)startSpinner;

对于您的 .m 文件，包括:

@synthesize bgimage,spinner,loadingLabel;

// add this in ViewDidLoad
//set loading label to alpha 0 so its not displayed
loadingLabel.alpha = 0;

一切都是它自己的功能

-(void)sendEmail {


    // create soft wait overlay so the user knows whats going on in the background.
    [self createWaitOverlay];

    //the guts of the message.
    SKPSMTPMessage *testMsg = [[SKPSMTPMessage alloc] init];
    testMsg.fromEmail = @"youremail@email.com";
    testMsg.toEmail = @"targetemailaddress@email.com";
    testMsg.relayHost = @"smtpout.yourserver.net";
    testMsg.requiresAuth = YES;
    testMsg.login = @"yourusername@email.com";
    testMsg.pass = @"yourPassWord";
    testMsg.subject = @"This is the email subject line";
    testMsg.wantsSecure = YES; // smtp.gmail.com doesn't work without TLS!



    // Only do this for self-signed certs!
    // testMsg.validateSSLChain = NO;
    testMsg.delegate = self;

    //email contents
    NSString * bodyMessage = [NSString stringWithFormat:@"This is the body of the email. You can put anything in here that you want."];


    NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/plain",kSKPSMTPPartContentTypeKey,
                               bodyMessage ,kSKPSMTPPartMessageKey,@"8bit",kSKPSMTPPartContentTransferEncodingKey,nil];

    testMsg.parts = [NSArray arrayWithObjects:plainPart,nil];

    [testMsg send];

}


- (void)messageSent:(SKPSMTPMessage *)message
    {
    [message release];

    //message has been successfully sent . you can notify the user of that and remove the wait overlay
    [self removeWaitOverlay];



    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message Sent" message:@"Thanks, we have sent your message"
                                                   delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    [alert show];
    [alert release];
}

- (void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error
{
    [message release];
    [self removeWaitOverlay];

    NSLog(@"delegate - error(%d): %@", [error code], [error localizedDescription]);

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Email Error" message:@"Sending Failed - Unknown Error :-("
                                                   delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    [alert show];
    [alert release];
}



-(void)createWaitOverlay {

    // fade the overlay in
    loadingLabel = @"Sending Test Drive...";
    bgimage = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,480)];
    bgimage.image = [UIImage imageNamed:@"waitOverLay.png"];
    [self.view addSubview:bgimage];
    bgimage.alpha = 0;
    [bgimage addSubview:loadingLabel];
    loadingLabel.alpha = 0;


    [UIView beginAnimations: @"Fade In" context:nil];
    [UIView setAnimationDelay:0];
    [UIView setAnimationDuration:.5];
    bgimage.alpha = 1;
    loadingLabel.alpha = 1;
    [UIView commitAnimations];
    [self startSpinner];

    [bgimage release];

}

-(void)removeWaitOverlay {

    //fade the overlay out

    [UIView beginAnimations: @"Fade Out" context:nil];
    [UIView setAnimationDelay:0];
    [UIView setAnimationDuration:.5];
    bgimage.alpha = 0;
    loadingLabel.alpha = 0;
    [UIView commitAnimations];
    [self stopSpinner];


}

-(void)startSpinner {

    spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.hidden = FALSE;
    spinner.frame = CGRectMake(137, 160, 50, 50);
    [spinner setHidesWhenStopped:YES];
    [self.view addSubview:spinner];
    [self.view bringSubviewToFront:spinner];
    [spinner startAnimating];
}

-(void)stopSpinner {

    [spinner stopAnimating];
    [spinner removeFromSuperview];
    [spinner release];

}

最终结果如下图所示。屏幕似乎变暗了一点(有点像显示 UIAlert 时)。它会显示一条消息，说明它已发送，然后在消息发送后“变亮”。

编码愉快!!

关于iphone - 锁定 MFMailComposeViewController 中的字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6284599/