我正在尝试在iOS应用程序上使用MFMailComposeViewController发送电子邮件。
我有一个在iPhone默认邮件应用程序中配置的Gmail帐户。但是每当我尝试发送电子邮件时，我都会得到MFMailComposeViewController canSendMail为假，因此，我的代码无法使用给定的抄送和附件打开邮件应用程序
#import <MessageUI/MessageUI.h>
#import "RNMail.h"
#import <React/RCTConvert.h>
#import <React/RCTLog.h>
@implementation RNMail
{
NSMutableDictionary *_callbacks;
}
- (instancetype)init
{
if ((self = [super init])) {
_callbacks = [[NSMutableDictionary alloc] init];
}
return self;
}
- (dispatch_queue_t)methodQueue
{
return dispatch_get_main_queue();
}
+ (BOOL)requiresMainQueueSetup
{
return YES;
}
RCT_EXPORT_MODULE()
RCT_EXPORT_METHOD(mail:(NSDictionary *)options
callback: (RCTResponseSenderBlock)callback)
{
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init];
mail.mailComposeDelegate = self;
_callbacks[RCTKeyForInstance(mail)] = callback;
if (options[@"subject"]){
NSString *subject = [RCTConvert NSString:options[@"subject"]];
[mail setSubject:subject];
}
bool *isHTML = NO;
if (options[@"isHTML"]){
isHTML = [options[@"isHTML"] boolValue];
}
if (options[@"body"]){
NSString *body = [RCTConvert NSString:options[@"body"]];
[mail setMessageBody:body isHTML:isHTML];
}
if (options[@"recipients"]){
NSArray *recipients = [RCTConvert NSArray:options[@"recipients"]];
[mail setToRecipients:recipients];
}
if (options[@"ccRecipients"]){
NSArray *ccRecipients = [RCTConvert NSArray:options[@"ccRecipients"]];
[mail setCcRecipients:ccRecipients];
}
if (options[@"bccRecipients"]){
NSArray *bccRecipients = [RCTConvert NSArray:options[@"bccRecipients"]];
[mail setBccRecipients:bccRecipients];
}
if (options[@"attachment"] && options[@"attachment"][@"path"] && options[@"attachment"][@"type"]){
NSString *attachmentPath = [RCTConvert NSString:options[@"attachment"][@"path"]];
NSString *attachmentType = [RCTConvert NSString:options[@"attachment"][@"type"]];
NSString *attachmentName = [RCTConvert NSString:options[@"attachment"][@"name"]];
// Set default filename if not specificed
if (!attachmentName) {
attachmentName = [[attachmentPath lastPathComponent] stringByDeletingPathExtension];
}
// Get the resource path and read the file using NSData
NSData *fileData = [NSData dataWithContentsOfFile:attachmentPath];
// Determine the MIME type
NSString *mimeType;
/*
* Add additional mime types and PR if necessary. Find the list
* of supported formats at http://www.iana.org/assignments/media-types/media-types.xhtml
*/
if ([attachmentType isEqualToString:@"jpg"]) {
mimeType = @"image/jpeg";
} else if ([attachmentType isEqualToString:@"png"]) {
mimeType = @"image/png";
} else if ([attachmentType isEqualToString:@"doc"]) {
mimeType = @"application/msword";
} else if ([attachmentType isEqualToString:@"ppt"]) {
mimeType = @"application/vnd.ms-powerpoint";
} else if ([attachmentType isEqualToString:@"html"]) {
mimeType = @"text/html";
} else if ([attachmentType isEqualToString:@"csv"]) {
mimeType = @"text/csv";
} else if ([attachmentType isEqualToString:@"pdf"]) {
mimeType = @"application/pdf";
} else if ([attachmentType isEqualToString:@"vcard"]) {
mimeType = @"text/vcard";
} else if ([attachmentType isEqualToString:@"json"]) {
mimeType = @"application/json";
} else if ([attachmentType isEqualToString:@"zip"]) {
mimeType = @"application/zip";
} else if ([attachmentType isEqualToString:@"text"]) {
mimeType = @"text/*";
} else if ([attachmentType isEqualToString:@"mp3"]) {
mimeType = @"audio/mpeg";
} else if ([attachmentType isEqualToString:@"wav"]) {
mimeType = @"audio/wav";
} else if ([attachmentType isEqualToString:@"aiff"]) {
mimeType = @"audio/aiff";
} else if ([attachmentType isEqualToString:@"flac"]) {
mimeType = @"audio/flac";
} else if ([attachmentType isEqualToString:@"ogg"]) {
mimeType = @"audio/ogg";
} else if ([attachmentType isEqualToString:@"xls"]) {
mimeType = @"application/vnd.ms-excel";
}
// Add attachment
[mail addAttachmentData:fileData mimeType:mimeType fileName:attachmentName];
}
UIViewController *root = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
while (root.presentedViewController) {
root = root.presentedViewController;
}
[root presentViewController:mail animated:YES completion:nil];
} else {
callback(@[@"not_available"]);
}
}
#pragma mark MFMailComposeViewControllerDelegate Methods
- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
NSString *key = RCTKeyForInstance(controller);
RCTResponseSenderBlock callback = _callbacks[key];
if (callback) {
switch (result) {
case MFMailComposeResultSent:
callback(@[[NSNull null] , @"sent"]);
break;
case MFMailComposeResultSaved:
callback(@[[NSNull null] , @"saved"]);
break;
case MFMailComposeResultCancelled:
callback(@[[NSNull null] , @"cancelled"]);
break;
case MFMailComposeResultFailed:
callback(@[@"failed"]);
break;
default:
callback(@[@"error"]);
break;
}
[_callbacks removeObjectForKey:key];
} else {
RCTLogWarn(@"No callback registered for mail: %@", controller.title);
}
UIViewController *ctrl = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
while (ctrl.presentedViewController && ctrl != controller) {
ctrl = ctrl.presentedViewController;
}
[ctrl dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark Private
static NSString *RCTKeyForInstance(id instance)
{
return [NSString stringWithFormat:@"%p", instance];
}
@end
iOS版本：12.1.2
我想知道MFMailComposeViewController上是否有任何最近的变化，这是否导致了这种情况？
我已经配置了邮件帐户，并且可以正常工作。因此，它不是已经发布的任何问题的重复
答案 0 :(得分：2)
MFMailComposeViewController直接链接到Apple的邮件应用程序。只有在安装和配置了Apple的邮件应用程序后，它才会返回true。
如果要打开Gmail（或已安装的任何默认应用），则需要使用mailto：//方案
这是我执行mailto部分的功能-包括从html到纯文本的荒谬的简单转换！
请注意mailto：//不支持附件或html内容。
/// Send email using mailto
/// - Parameters:
/// - to: array of email addresses
/// - subject: subject
/// - body: body
/// - isHtml: isHtml (only <br/> and <br /> are supported)
/// - Returns: true if sent
func sendByURL(to:[String],subject:String,body:String, isHtml:Bool) -> Bool {
var txtBody = body
if isHtml {
txtBody = body.replacingOccurrences(of: "<br />", with: "\n")
txtBody = txtBody.replacingOccurrences(of: "<br/>", with: "\n")
if txtBody.contains("/>") {
print("Can't send html email with url interface")
return false
}
}
let toJoined = to.joined(separator: ",")
guard var feedbackUrl = URLComponents.init(string: "mailto:\(toJoined)") else {
return false
}
var queryItems: [URLQueryItem] = []
queryItems.append(URLQueryItem.init(name: "SUBJECT", value: subject))
queryItems.append(URLQueryItem.init(name: "BODY",
value: txtBody))
feedbackUrl.queryItems = queryItems
if let url = feedbackUrl.url {
// This is probably an unnecessary check
// You do need to add 'mailto' to your LSApplicationQuerySchemes for the check to be allowed
// <key>LSApplicationQueriesSchemes</key>
// <array>
// <string>mailto</string>
// </array>
if UIApplication.shared.canOpenURL(url){
UIApplication.shared.open(url)
return true
}
}
return false
}