Ios 如何在Xcode中在应用程序内部发送电子邮件？

我是xcode新手，想知道如何在应用程序中发送电子邮件！下面是我的代码，但我一直收到错误“没有可见的@interface for'jakem'声明选择器'presentViewControllerAnimated:'”。我的代码完全错了吗？还是我忘了声明选择器，如何声明选择器？我在互联网上搜索了至少一个小时，但什么都没用。有人请帮帮我

    -(IBAction)sendEmail{

    MFMailComposeViewController *composer = [[MFMailComposeViewController alloc] init];
    [composer setMailComposeDelegate:self];
    if ([MFMailComposeViewController canSendMail]) {
    [composer setToRecipients:[NSArray          arrayWithObjects:@"FrankMurphy.CEO@RomansXIII.com", nil]];
    [composer setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
    [self presentViewController:composer animated:YES];

    }

    }

    -(void)mailComposeController:(MFMailComposeViewController *)controller   didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    if(error) {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"error" message:[NSString    stringWithFormat:@"error %@", [error description]] delegate:nil cancelButtonTitle:@"dismiss" otherButtonTitles:nil, nil];
    [alert show];
    [self dismissViewControllerAnimated:YES];
    }
    else {
    [self dismissViewControllerAnimated:YES];
    }
    }

---

检查您是否为MFMAILCOMPOSEVIEWCONTROLLERGATE。 你这样做吗

@interface YouClassName : UIViewController <MFMailComposeViewControllerDelegate> 

@end

@接口YouClassName:UIViewController
@结束

我认为您使用了错误的方法。试一试

[self presentViewController:(UIViewController *) animated:(BOOL) completion:(void)completion];

而不是：

[self presentViewController:composer animated:YES];

---

我在Sendgrid工作。我们有一个Objective-c库，可以让您从应用程序内部快速发送电子邮件。您可以使用cocoapod在项目中快速安装库

然后，从您的（IBAction）发送电子邮件将如下所示：

-(IBAction)sendEmail{

sendgrid *msg = [sendgrid user:@"username" andPass:@"password"];
msg.to = @"FrankMurphy.CEO@RomansXIII.com";
msg.from = @"me@bar.com";
msg.text = @"hello world";   
msg.html = @"<h1>hello world!</h1>";

[msg sendWithWeb];

}

-（iAction）发送电子邮件{
sendgrid*msg=[sendgrid用户：@“用户名”和密码]；
msg.to=@“弗兰克墨菲。CEO@RomansXIII.com";
msg.from=@”me@bar.com";
msg.text=@“你好，世界”；
msg.html=@“你好，世界！”；
[msg sendWithWeb]；
}
在.h头文件中

 #import <UIKit/UIKit.h>


#import <MessageUI/MessageUI.h>



@interface SimpleEmailViewController : UIViewController <MFMailComposeViewControllerDelegate> // Add the delegate
- (IBAction)showEmail:(id)sender;



@end

谢谢你的回复！是的，我在头文件中这样做了
- (IBAction)showEmail:(id)sender {
// Email Subject
NSString *emailTitle = @"Test Email";
// Email Content
NSString *messageBody = @"iOS programming is so fun!";
// To address
NSArray *toRecipents = [NSArray arrayWithObject:@"info@finetechnosoft.in"];

MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
mc.mailComposeDelegate = self;
[mc setSubject:emailTitle];
[mc setMessageBody:messageBody isHTML:NO];
[mc setToRecipients:toRecipents];

// Present mail view controller on screen
[self presentViewController:mc animated:YES completion:NULL];
}




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



switch (result)
{
    case MFMailComposeResultCancelled:
        NSLog(@"Mail cancelled");
        break;
    case MFMailComposeResultSaved:
        NSLog(@"Mail saved");
        break;
    case MFMailComposeResultSent:
        NSLog(@"Mail sent");
        break;
    case MFMailComposeResultFailed:
        NSLog(@"Mail sent failure: %@", [error localizedDescription]);
        break;
    default:
        break;
}


// Close the Mail Interface
[self dismissViewControllerAnimated:YES completion:NULL];
}