ios - Mail Composer 不会关闭 iOS

Question

我有带按钮的 ViewController 和按钮上的操作:

        - (IBAction)clickMe:(id)sender {
            MailHelper *helper = [[MailHelper alloc] init];
            [helper setAllData:self];
        }

此外，还有用于邮件撰写的辅助类(MailHelper.h):

    #import <Foundation/Foundation.h>
    #import <UIKit/UIKit.h>
    #import <MessageUI/MessageUI.h>

    @interface MailHelper : UIViewController<MFMailComposeViewControllerDelegate>

    @property MFMailComposeViewController* mailView;
    - (void)setAllData:(UIViewController *)ctrl;

    @end

和实现(MailHelper.m):

- (void)setAllData:(UIViewController *)ctrl {

    mailView = [[MFMailComposeViewController alloc] init];
    mailView.mailComposeDelegate = self;

    mailView.toRecipients = @[@"mail@email.com"];
    [mailView setSubject:@"Subject"];

    [ctrl presentViewController:mailView animated:YES completion:nil];
}

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

    [self dismissViewControllerAnimated:YES completion:nil];
}

我可以打开邮件编辑器，但在发送邮件、保存草稿或删除草稿时应用程序崩溃。有什么想法吗？

Answer 1

当 MFMailComposeViewController请求被解雇 您正在调用 self 上的解雇方法但是self正在展示 te MFMailComposeViewController .变化:

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

    [self dismissViewControllerAnimated:YES completion:nil];
}

到

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

    [controller dismissViewControllerAnimated:YES completion:nil];
}

要解决重新分配问题，请添加以下内容:

导入<objc/runtime.h>在你的 .m 文件中制作 self与传递的 Controller 相关联:

static void * MailHelperKey = &MailHelperKey;

- (void)setAllData:(UIViewController *)ctrl {
mailView = [[MFMailComposeViewController alloc] init];
mailView.mailComposeDelegate = self;

objc_setAssociatedObject(mailView, MailHelperKey, self, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
....
}


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

    [controller dismissViewControllerAnimated:YES completion:nil];
    objc_removeAssociatedObjects(controller);
}

这将确保只要呈现控件未被释放您的邮件助手。不值得从美丽的价格，但应该工作。