Ios MFMailComposer ViewController对象未在iPad中分配，但在模拟器中工作正常_Ios_Objective C_Email_Mfmailcomposer

Ios MFMailComposer ViewController对象未在iPad中分配，但在模拟器中工作正常

ios objective-c email

Ios MFMailComposer ViewController对象未在iPad中分配，但在模拟器中工作正常,ios,objective-c,email,mfmailcomposer,Ios,Objective C,Email,Mfmailcomposer,当Ialloc/initMFMailComposerViewController未分配时，对象为nil。应用程序在显示mailViewController时崩溃。这是我的密码： MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; [picker setSubject:@"Photos"]; NSString

当I

alloc

init

MFMailComposerViewController

未分配时，对象为

nil

。应用程序在显示

mailViewController

时崩溃。这是我的密码：

MFMailComposeViewController  *picker = [[MFMailComposeViewController alloc] init];

picker.mailComposeDelegate = self;

[picker setSubject:@"Photos"];

NSString *body = [NSString stringWithFormat:@"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"
                  "<html>"
                  "<head>"
                  "<meta http-equiv=\"Content-Type\" content=\"text/html;charset=UTF-8\">"
                  "</head>"
                  "<body>"
                  "%@"
                  "</body>"
                  "</html>",[NSString stringWithFormat:@"Picture from %@",APP_NAME]];

[picker setMessageBody:body isHTML:YES];

NSData* data = UIImagePNGRepresentation(self.sharedImage);

[picker addAttachmentData:data mimeType:@"image/png" fileName:APP_NAME];
[self presentViewController:picker animated:YES completion:nil];

MFMailComposeViewController*picker=[[MFMailComposeViewController alloc]init]；
picker.mailComposeDelegate=self；
[picker setSubject:@“照片”]；
NSString*body=[NSString stringWithFormat:@]
""
""
""
""
""
"%@"
""
“”，[NSString stringWithFormat:@“来自%@”的图片，应用程序名称]]；
[picker setMessageBody:body isHTML:YES]；
NSData*data=UIImagePNGRepresentation（self.sharedImage）；
[picker addAttachmentData:data mimeType:@“image/png”文件名：APP_NAME]；
[自我呈现视图控制器：选择器已设置动画：是完成：无]；

第1步：我认为首先需要从设备设置中添加帐户。如果您没有从设置中添加帐户，则您将收到此类问题

第2步：属性并合成MFMailComposeView控件对象

您是否正在调用

canSendMail

以确定是否可以发送电子邮件？不，我没有调用canSendMail方法