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[MFMailComposeViewController canSendMail] issue

 2 years ago
source link: https://fann.im/blog/2011/12/27/mfmailcomposeviewcontroller-cansendmail-issue/
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[MFMailComposeViewController canSendMail] issue

Dec 27, 2011

发现 MFMailComposeViewController 一个挺奇怪的问题，代码一：

if ([MFMailComposeViewController canSendMail]) {
    MFMailComposeViewController *mailComposer = [[MFMailComposeViewController alloc] init];
    [mailComposer setSubject:@"Mail"];
    //...
    [self presentModalViewController:mailComposer animated:YES];
    [mailComposer release];
}

如果设备没有设置 Mail，那么该操作不会有任何反应。不会有弹窗出现。

MFMailComposeViewController *mailComposer = [[MFMailComposeViewController alloc] init];
if (![MFMailComposeViewController canSendMail]) {
    return;
}
//...

代码二这种情况下如果没有设置 Mail，会有系统弹窗提示 “无邮件账户”。

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