当用户点击我应用程序中的按钮时，我想截取当前视图的屏幕截图并打开一条带有该屏幕截图图像作为附件的文本消息。如何在 iOS7 中做到这一点？
（我看过有关如何截取屏幕截图的帖子，但没有看到任何有关截取屏幕截图并将其附加到消息的帖子）
谢谢！
【问题讨论】：
Quartz Display Services，即CGDisplayCreateImageForRect或CGDisplayCreateImage
标签： ios sms screenshot mms
1.截图添加QuartzCore框架，可以使用UIGraphicsBeginImageContextWithOptions
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
[self.myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *theImageData=UIImageJPEGRepresentation(theImage, 1.0 ); //you can use PNG too
2. 要在邮件中附加此图像，请在构建阶段添加MessageUI 框架。并使用此NSData 进行附加，类似这样
//Check if mail can be sent
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
mailer.mailComposeDelegate = self;
// Add NSData you got as screenshot to attachment
[mailer addAttachmentData:theImageData mimeType:@"image/jpeg" fileName:[NSString stringWithFormat:@"test.jpg"]];
[self presentModalViewController:mailer animated:YES];
}
编辑：
3.通过短信发送图片
// Will Work only for iOS 7
MFMessageComposeViewController* messageComposer = [[MFMessageComposeViewController alloc] init];
messageComposer.messageComposeDelegate = self; // As mentioned by the OP in comments, we have to set messageComposeDelegate to self.
messageComposer.recipients = [NSArray arrayWithObject:@"123456789"];
if([MFMessageComposeViewController canSendText])
{
if([MFMessageComposeViewController respondsToSelector:@selector(canSendAttachments)] && [MFMessageComposeViewController canSendAttachments])
{
NSString* uti = (NSString*)kUTTypeMessage;
[messageComposer addAttachmentData:theImageData typeIdentifier:uti filename:@"filename.jpg"];
}
[self presentViewController:messageComposer animated:YES completion:nil];
}
处理来自MFMessageComposeViewController的委托回调
- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{
}
【讨论】：
- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result;，您需要提供 `[self dismissViewControllerAnimated:YES completion:nil];`。当点击取消/完成或出现任何错误时调用此方法。
UIWindow *window = [[UIApplication sharedApplication]keyWindow];UIView *viewForScreen = window.viewForBaselineLayout;，不知道行不行
要截屏，您可以使用Quartz Display Services 方法
您可以将矩形传递为
CGRect = [self bounds];
然后使用CGDisplayCreateImageForRect创建图像
CGImageRef selectedScreenImage;
selectedScreenImage = CGDisplayCreateImageForRect(kCGDirectMainDisplay, rect);
将其转换为NSData
NSData *data = (NSData *)CFBridgingRelease(CGDataProviderCopyData(CGImageGetDataProvider(selectedScreenImage)));
然后使用MFMailComposeViewController将其附加到您的消息中
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *cvc = [[MFMailComposeViewController alloc] init];
cvc.mailComposeDelegate = self;
[cvc addAttachmentData:data mimeType:@"image/jpeg" fileName:[NSString stringWithFormat:@"YOUR_IMAGE.png"]];
[self presentModalViewController:cvc animated:YES];
}
【讨论】：
发送彩信
- (UIImage *) imageFromViewIniOS7
{
UIImage* image = nil;
UIGraphicsBeginImageContext(contentScrollview.contentSize);
{
CGPoint savedContentOffset = contentScrollview.contentOffset;
CGRect savedFrame = contentScrollview.frame;
contentScrollview.contentOffset = CGPointZero;
contentScrollview.frame = CGRectMake(0, 0, contentScrollview.contentSize.width, contentScrollview.contentSize.height);
if ([[NSString versionofiOS] intValue]>=7)
{
[contentScrollview drawViewHierarchyInRect:contentScrollview.bounds afterScreenUpdates:YES];
}
else
{
[contentScrollview.layer renderInContext: UIGraphicsGetCurrentContext()];
}
image = UIGraphicsGetImageFromCurrentImageContext();
contentScrollview.contentOffset = savedContentOffset;
contentScrollview.frame = savedFrame;
}
UIGraphicsEndImageContext();
return image;
}
-(void)buttonAction
{
MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
pasteboard.persistent = YES;
pasteboard.image = [self imageFromViewIniOS7];
NSString *phoneToCall = @"sms:";
NSString *phoneToCallEncoded = [phoneToCall stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSURL *url = [[NSURL alloc] initWithString:phoneToCallEncoded];
[[UIApplication sharedApplication] openURL:url];
if([MFMessageComposeViewController canSendText]) {
NSMutableString *emailBody = [[NSMutableString alloc] initWithString:@"Your Email Body"];
picker.messageComposeDelegate = self;
picker.recipients = [NSArray arrayWithObject:@"123456789"];
[picker setBody:emailBody];// your recipient number or self for testing
picker.body = emailBody;
NSLog(@"Picker -- %@",picker.body);
[self presentModalViewController:picker animated:YES];
NSLog(@"SMS fired");
}
}
【讨论】：