Objective c 如何从截图创建图像并发送到消息界面

我对Objective-C非常陌生。我正在尝试从屏幕截图创建一个图像，并将其发送到消息接口以作为消息发送。我已经研究了许多Stackoverflow问题，其中一个建议使用iOS 7中新增的

SnapshotViewAfterScreenUpdate

。它返回一个

UIView

指针，但我不知道如何从该指针生成图像，然后将其作为消息发送到消息接口。非常感谢您的帮助。

这是您从屏幕上获得的UIImage：

UIGraphicsBeginImageContext(self.bounds.size);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

---

这是您从屏幕上获得的UIImage：

UIGraphicsBeginImageContext(self.bounds.size);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

要共享图像，则可以使用

UIActivityViewController

：

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:[NSArray arrayWithObjects:@"I would like to share it.",newPNG, nil] applicationActivities:nil];
activityVC.excludedActivityTypes = @[ UIActivityTypeMessage ,UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll];
[self presentViewController:activityVC animated:YES completion:nil];

要共享图像，则可以使用

UIActivityViewController

：

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:[NSArray arrayWithObjects:@"I would like to share it.",newPNG, nil] applicationActivities:nil];
activityVC.excludedActivityTypes = @[ UIActivityTypeMessage ,UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll];
[self presentViewController:activityVC animated:YES completion:nil];

---

谷歌

UIGraphicsBeginImageContext

google

UIGraphicsBeginImageContext