Question

我正在尝试从我的iOS应用中发送电子邮件。

我们的想法是拥有一个类SendMessage，所有类都使用该类来从应用程序中发送电子邮件。它是NSObject的子类，是MFMailComposeViewControllerDelegate

这就是SendMessage类的样子

@implementation SendMessage

- (void) sendEmailFromViewController : (UIViewController *)viewController withSubject : (NSString *) subject withRecipient : (NSString *)recipient withMessage : (NSString *)message withCompletionBlock : (void(^)(void))completionBlock withFailure : (void(^)(void))failure {

    self.viewController = viewController;

    if (![MFMailComposeViewController canSendMail]){
        if (failure)
            failure();
    }
    else {
        MFMailComposeViewController *messageController = [[MFMailComposeViewController alloc] init];
        messageController.mailComposeDelegate = self.viewController;
        [messageController setSubject:subject];
        [messageController setToRecipients:[NSArray arrayWithObject:recipient]];
        [messageController setMessageBody:message isHTML:NO];

        [self.viewController presentModalViewController:messageController animated:YES];

    }
}

-(void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    [self.viewController dismissViewControllerAnimated:YES completion:nil];
}

@end

我正在尝试使用以下方法调用该类：

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == 3) {
        SendMessage *sendFeedback = [[SendMessage alloc] init];
        [sendFeedback sendEmailFromViewController:self withSubject:@"App Feedback" withRecipient:@"ashisha@moj.io" withMessage:@"This is app feedback" withCompletionBlock:nil withFailure:nil];
    }
}

问题是虽然我能够发送电子邮件，但是没有调用委托方法。我该如何解决？

Answer 1

您的代理人是UIViewController，因此请在那里实施mailComposeController:didFinishWithResult:error委托方法。

Answer 2

我认为问题是您的对象sendFeedback在块结束时被释放。

最佳解决方案是创建 singleton 对象而不是使用它

在SendMessage.h文件中添加

+ (instancetype) sharedManager;

在SendMessage.m文件中添加

+ (instancetype) sharedManager{
    static SendMessage* instance = nil;
    if(!instance){
        instance = [[SendMessage alloc] init];
    }
    return instance;
}

您可以在代码中的任何位置使用单身

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == 3) {
        SendMessage *sendFeedback = [SendMessage sharedManager];
        [sendFeedback sendEmailFromViewController:self withSubject:@"App Feedback" withRecipient:@"ashisha@moj.io" withMessage:@"This is app feedback" withCompletionBlock:nil withFailure:nil];
    }
}

同样messageController.mailComposeDelegate必须设为自我

从iOS sdk发送电子邮件

2 个答案: