那些遇到过的问题

如何在iOS 6中为UIActivityViewController设置收件人？

Mat*_*ham 32 iphone objective-c ios6 uiactivityviewcontroller

我UIActivityViewController在iOS6中使用新类为用户提供各种共享选项.您可以将一系列参数传递给它,例如文本,链接和图像,剩下的就完成了.

如何定义收件人？例如,通过邮件或短信共享应该能够接受收件人,但我无法弄清楚如何调用此行为.

我不想必须单独使用MFMessageComposeViewController,UIActivityViewController因为这只会破坏共享控制器的目的.

有什么建议？

UIActivityViewController类参考

编辑:现在已经提交了Apple,并随后与重复的错误报告合并.

关于OpenRadar的错误报告

小智 24

为了在iOS6上使用UIActivityViewController 添加主题,这是任何人都可以使用的最佳解决方案.所有你需要做的就是在初始化UIActivityViewController时调用以下内容.

UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:applicationActivities];
[activityViewController setValue:@"My Subject Text" forKey:@"subject"];
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并且您的UIActivityViewController中填充了主题.

  • 收件人怎么样？我们可以这样添加吗？ (13认同)

Emm*_*ris 10

我只想出一个解决这个问题的方法(在我的例子中设置了电子邮件的主题):在内部,UIActivityViewController将在某个时候调用MFMailComposeViewController类的setMessageBody:isHTML:方法,只是拦截该调用并在内部创建一个调用setSubject:方法.感谢"方法调配"技术,它看起来像:

#import <objc/message.h>

static void MethodSwizzle(Class c, SEL origSEL, SEL overrideSEL)
{
    Method origMethod = class_getInstanceMethod(c, origSEL);
    Method overrideMethod = class_getInstanceMethod(c, overrideSEL);

    if (class_addMethod(c, origSEL, method_getImplementation(overrideMethod), method_getTypeEncoding(overrideMethod))) {
        class_replaceMethod(c, overrideSEL, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    } else {
        method_exchangeImplementations(origMethod, overrideMethod);
    }
}

@implementation MFMailComposeViewController (force_subject)

- (void)setMessageBodySwizzled:(NSString*)body isHTML:(BOOL)isHTML
{
    if (isHTML == YES) {
        NSRange range = [body rangeOfString:@"<title>.*</title>" options:NSRegularExpressionSearch|NSCaseInsensitiveSearch];
        if (range.location != NSNotFound) {
            NSScanner *scanner = [NSScanner scannerWithString:body];
            [scanner setScanLocation:range.location+7];
            NSString *subject = [NSString string];
            if ([scanner scanUpToString:@"</title>" intoString:&subject] == YES) {
                [self setSubject:subject];
            }
        }
    }
    [self setMessageBodySwizzled:body isHTML:isHTML];
}

@end
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在使用UIActivityViewController之前调用以下代码行:

MethodSwizzle([MFMailComposeViewController class], @selector(setMessageBody:isHTML:), @selector(setMessageBodySwizzled:isHTML:));
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然后传递给UIActivityViewController一个自定义UIActivityItemProvider,为UIActivityTypeMail返回一个HTML NSString,如:

<html><head>
<title>Subject of the mail</title>
</head><body>
Body of the <b>mail</b>
</body></html>
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电子邮件的主题是从HTML标题中提取的(使用该部分的纯文本,没有html实体或标签).

使用该方法,我让您详细说明设置邮件收件人的优雅方法.

ily*_*hev 8

虽然目前看来mailto:设置电子邮件主题和正文的解决方案不起作用,但如果您想将电子邮件正文设置为包含HTML并仍然使用Apple的系统电子邮件图标,则无论如何都不够通过UIActivityViewController.

这正是我们想要做的:使用系统图标,但电子邮件包含HTML正文和自定义主题.

我们的解决方案是一种破解,但它运作良好,至少在目前.它确实涉及使用MFMailComposeViewController,但它仍然允许您使用带有UIActivityViewController的系统邮件图标.

第1步:创建一个符合UIActivityItemSource的包装类,如下所示:

    @interface ActivityItemSource : NSObject <UIActivityItemSource>
    @property (nonatomic, strong) id object;
    - (id) initWithObject:(id) objectToUse;
    @end

    @implementation ActivityItemSource

   - (id) initWithObject:(id) objectToUse
    {
        self = [super init];
        if (self) {
            self.object = objectToUse;
        }
        return self;
    }


    - (id)activityViewController:(UIActivityViewController *)activityViewController                 itemForActivityType:(NSString *)activityType
    {
    return self.object;
    }

    - (id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
    {

        return self.object;
    }
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第2步:将UIActivityViewController子类化,并使其成为MFMailComposeViewControllerDelegate,如下所示:

    @interface ActivityViewController : UIActivityViewController         <MFMailComposeViewControllerDelegate>

    @property (nonatomic, strong) id object;

    - (id) initWithObject:(id) objectToUse;
    @end


    @implementation ActivityViewController

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

        switch (result)
        {
            case MFMailComposeResultSent:
            case MFMailComposeResultSaved:
                //successfully composed an email
                break;
            case MFMailComposeResultCancelled:
                break;
            case MFMailComposeResultFailed:
                break;
        }

    //dismiss the compose view and then the action view
        [self dismissViewControllerAnimated:YES completion:^() {
            [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];        
        }];

    }

    - (id) initWithObject:(id) objectToUse
    {

        self = [super initWithActivityItems:[NSArray arrayWithObjects:[[ActivityItemSource alloc] initWithObject:objectToUse], nil] applicationActivities:nil];

        if (self) {
            self.excludedActivityTypes = [NSArray arrayWithObjects: UIActivityTypePostToWeibo, UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, nil];

            self.object = objectToUse;
        }
        return self;
    }
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注意:当您调用时,super initWithActivityItems您将包装您将在自定义ActivityItemSource中共享的对象

步骤3:当用户点击Mail图标时,启动您自己的MFMailComposeViewController而不是系统.

您可以activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(NSString *)activityType在ActivityItemSource类的方法中执行此操作:

    - (id)activityViewController:(UIActivityViewController *)activityViewController                 itemForActivityType:(NSString *)activityType
    {
        if([activityType isEqualToString:UIActivityTypeMail]) {
                //TODO: fix; this is a hack; but we have to wait till apple fixes the         inability to set subject and html body of email when using UIActivityViewController
                [self setEmailContent:activityViewController];
                return nil;
            }
         return self.object;
    }


    - (void) setEmailContent:(UIActivityViewController *)activityViewController 
    {

       MFMailComposeViewController *mailController = [ShareViewController mailComposeControllerWithObject: self.object withDelegate: activityViewController];

        [activityViewController presentViewController:mailController animated:YES completion:nil];

    }
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在该mailComposeControllerWithObject方法中,您实例化MFMailComposeViewController类的实例并将其设置为包含您想要的任何数据.另请注意,您可以将其设置activityViewController为撰写视图的委托.

这样做的原因是当显示合成模态时,它会阻止显示其他模态,即您显示自己的合成视图会阻止系统合成视图显示.绝对是一个黑客,但它完成了工作.

希望这可以帮助.

the*_*ror 3

这里所有的功劳都归功于 Emanuelle，因为他提出了大部分代码。

尽管我想我会发布他的代码的修改版本，以帮助设置收件人。

我在 MFMailComposeViewController 上使用了类别

#import "MFMailComposeViewController+Recipient.h"
#import <objc/message.h>

@implementation MFMailComposeViewController (Recipient)

+ (void)load {
    MethodSwizzle(self, @selector(setMessageBody:isHTML:), @selector(setMessageBodySwizzled:isHTML:));
}



static void MethodSwizzle(Class c, SEL origSEL, SEL overrideSEL)
{
    Method origMethod = class_getInstanceMethod(c, origSEL);
    Method overrideMethod = class_getInstanceMethod(c, overrideSEL);

    if (class_addMethod(c, origSEL, method_getImplementation(overrideMethod), method_getTypeEncoding(overrideMethod))) {
        class_replaceMethod(c, overrideSEL, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    } else {
        method_exchangeImplementations(origMethod, overrideMethod);
    }
}

- (void)setMessageBodySwizzled:(NSString*)body isHTML:(BOOL)isHTML
{
    if (isHTML == YES) {
        NSRange range = [body rangeOfString:@"<torecipients>.*</torecipients>" options:NSRegularExpressionSearch|NSCaseInsensitiveSearch];
        if (range.location != NSNotFound) {
            NSScanner *scanner = [NSScanner scannerWithString:body];
            [scanner setScanLocation:range.location+14];
            NSString *recipientsString = [NSString string];
            if ([scanner scanUpToString:@"</torecipients>" intoString:&recipientsString] == YES) {
                NSArray * recipients = [recipientsString componentsSeparatedByString:@";"];
                [self setToRecipients:recipients];
            }
            body = [body stringByReplacingCharactersInRange:range withString:@""];
        }
    }
    [self setMessageBodySwizzled:body isHTML:isHTML];
}

@end
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