Question

我在我的应用程序中使用MFMailComposeViewController canSendMail一切正常但如果iPhone或iPad上没有帐户，它会返回标准的alertview我想要更改的内容。如果我在其他地方发出警报，它将返回2个警报。有没有办法改变它返回的标准警报？或者至少改变其中的文字？

MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
if ([MFMailComposeViewController canSendMail]) {
    controller.mailComposeDelegate = self;
    controller.navigationBar.tintColor = [UIColor grayColor];
    NSArray *toRecipients = [NSArray arrayWithObject:@"info@info.nl"];
    [controller setToRecipients:toRecipients];
    [controller setSubject:@"bericht van info"];
    [self presentModalViewController:controller animated:YES];
    [controller release];
}
else {

}

Answer 1

尝试一件事..将您的MFMailComposeViewController初始化代码移到canSendMail块中。

Answer 2

在if：

中移动'MFMailComposeViewController'的alloc

if ([MFMailComposeViewController canSendMail]) {
    MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
    controller.mailComposeDelegate = self;
    controller.navigationBar.tintColor = [UIColor grayColor];
    NSArray *toRecipients = [NSArray arrayWithObject:@"info@info.nl"];
    [controller setToRecipients:toRecipients];
    [controller setSubject:@"bericht van info"];
    [self presentModalViewController:controller animated:YES];
    [controller release];
} else {
    // Display custom alert here.
}

Answer 3

您可以检查设备是否可以使用

发送电子邮件

[MFMailComposeViewController canSendMail]

如果没有，请在旁边显示对话框

如果返回no，MFMailComposeViewController canSendMail更改警报

3 个答案: