Question

默认情况下，我的邮件编辑器会选择它呈现视图控制器的背景图像。所以我有逻辑来禁用那个背景，它在模拟器中就像一个冠军，但在物理设备上却没有（或者至少在iPhone 4S上。两者都在使用iOS 8.1

- (void)composeEmail
{
if ([MFMailComposeViewController canSendMail])
{

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

        // Disable navbar styling in presenting VC
        [[UINavigationBar appearance] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];


        NSString *emailTitle = @"Subject";
        NSString *messageBody = @"Body";

        //configure mail message

        [self.mailComposer setSubject:emailTitle];
        [self.mailComposer setMessageBody:messageBody isHTML:NO];


        // Present mail view controller on screen
        [self.callingController presentViewController:self.mailComposer animated:YES completion:^{
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

        }];
    }
} else {
    // alert here
}
}

- (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;
}

// Enable navbar styling in presenting VC
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"logo.png"] forBarMetrics:UIBarMetricsDefault];

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

Answer 1

事实证明，解决方案既简单又不明显。修改UINavigationBar的命令必须在分配邮件编辑器之前完成。

[[UINavigationBar appearance] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
self.mailComposer = [[MFMailComposeViewController alloc] init];

Answer 2

代码中有两处更改：

在撰写电子邮件方式

中使用以下行

[self.mailComposer.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

在didFinishWithResult方法中使用以下行。

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"Happy-Rose-Day.png"] forBarMetrics:UIBarMetricsDefault];

我认为最后一点可能不需要，因为你的代码也在工作（[UINavigationBar外观]）

MFMailComposeViewController navigationBar覆盖在模拟器中工作，但不在设备中工作

2 个答案: