菜鸟教程小白 发表于 2022-12-12 23:53:51

ios - MFMailComposeViewController iOS 上缺少取消和发送按钮


                                            <p><p>我正在开发一个 iOS 应用程序，用户可以在其中发送电子邮件和发送短信。我正在使用 MFMailComposeViewController 和 MFMessageComposeViewController 发送电子邮件和短信，但有时取消和发送按钮会出现在 Composer 上，有时它根本不会出现。这个问题是随机的，我已经尝试了很多。任何帮助将不胜感激。
<strong>代码</strong></p>

<pre><code>MFMailComposeViewController *mail = [ init];
mail.mailComposeDelegate = self;
;
;
];
;
</code></pre>

<p>我已经在我的 viewController 的头文件中实现了 MFMailComposeViewControllerDelegate。</p></p>
                                    <br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
                                            <p><p>好的，我终于对此有了一些了解。我的问题部分源于我在应用程序委托(delegate) (Swift) 中更改导航栏颜色:</p>

<pre><code>    UINavigationBar.appearance().barTintColor = UIColor.black
    UIApplication.shared.statusBarStyle = .lightContent

    // To get my hamburger menu white colored
    UINavigationBar.appearance().tintColor = UIColor.white
</code></pre>

<p>由于这一点，以及与缩放模式的一些交互(参见我上面的评论)，有时我会在我的邮件 Controller 中将取消/发送按钮设置为白色。像这样:</p>

<p> <a href="/image/68DdQ.png" rel="noreferrer noopener nofollow"><img src="/image/68DdQ.png" alt="enter image description here"/></a> </p>

<p>我将向您展示我的类(class)( Objective-C )，它显示了邮件 Controller ，现在它可以帮助我解决这个问题中的问题。注意这一行:</p>

<pre><code>.tintColor = appleBlueTintColor;
</code></pre>

<p>真的是这一切的秘诀:</p>

<pre><code>#import &lt;MessageUI/MessageUI.h&gt;

@interface SendEmail : MFMailComposeViewController

// Returns nil if can&#39;t send email on this device. Displays an alert before returning in this case.
- (id) initWithParentViewController: (UIViewController *) parent;

// Show the email composer.
- (void) show;

// Message to append to the bottom of support emails. The string doesn&#39;t contain HTML.
+ (NSString *) getVersionDetailsFor: (NSString *) appName;

@end

@interface SendEmail ()&lt;MFMailComposeViewControllerDelegate&gt;
@property (nonatomic, weak) UIViewController *myParent;
@property (nonatomic, strong) UIColor *previousBarTintColor;
@property (nonatomic, strong) UIColor *previousTintColor;
@end

#import &#34;SendEmail.h&#34;
#import &lt;sys/utsname.h&gt;
@implementation SendEmail

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = ;
    if (self) {
      // Custom initialization
    }
    return self;
}

// Using this init method depends on the `show` method being called immediately after-- to reset the nav bar colors back to what they were originally.
- (id) initWithParentViewController: (UIViewController *) theParent {
    if (!) {
      NSString *title = @&#34;Sorry, the app isn&#39;t allowed to send email.&#34;;
      NSString *message = @&#34;Have you configured this device to send email?&#34;;
      UIAlertController *alert = ;
      ];
      ;
      return nil;
    }

    // The default app nav bar color is black-- and that looks bad on the mail VC. Need to change and then set back both the barTintColor and the tintColor (in the `show` method).

    self.previousBarTintColor = .barTintColor;
    self.previousTintColor = .tintColor;

    [ setBarTintColor:];

    // I got this color from the digital color meter-- this is what it is supposed to be on the Cancel/Send buttons.
    UIColor *appleBlueTintColor = ;
    .tintColor = appleBlueTintColor;

    self = ;
    if (self) {
      self.mailComposeDelegate = self;
      self.myParent = theParent;
    }

    return self;
}

- (void) show {
    [self.myParent presentViewController:self animated:YES completion:^{
      [ setBarTintColor: self.previousBarTintColor];
      .tintColor = self.previousTintColor;
    }];
}

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

+ (NSString *) getVersionDetailsFor: (NSString *) appName;
{
    NSMutableString *message = ;
    ;
    systemVersion]];
    [message appendFormat:@&#34;%@ version: %@ (%@)\n&#34;, appName,
   [ objectForInfoDictionaryKey:@&#34;CFBundleShortVersionString&#34;],
   [objectForInfoDictionaryKey:@&#34;CFBundleVersion&#34;]];
    ];

    return message;
}

// See http://stackoverflow.com/questions/11197509/ios-iphone-get-device-model-and-make
+ (NSString *) machineName;
{
    struct utsname systemInfo;
    uname(&amp;systemInfo);

    return [NSString stringWithCString:systemInfo.machine
                              encoding:NSUTF8StringEncoding];
}

@end
</code></pre></p>
                                   
                                                <p style="font-size: 20px;">关于ios - MFMailComposeViewController iOS 上缺少取消和发送按钮，我们在Stack Overflow上找到一个类似的问题：
                                                        <a href="https://stackoverflow.com/questions/42189722/" rel="noreferrer noopener nofollow" style="color: red;">
                                                                https://stackoverflow.com/questions/42189722/
                                                        </a>
                                                </p>
                                       
页: [1]
查看完整版本: ios - MFMailComposeViewController iOS 上缺少取消和发送按钮