ios 长按截图

//添加点击方法
UILongPressGestureRecognizer * longTap =[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(imglongTapClick:)];
[self.view addGestureRecognizer:longTap];

-(void)imglongTapClick:(UILongPressGestureRecognizer )gestrue{
if (gestrue.state != UIGestureRecognizerStateBegan)
{
//这个if一定要加，因为长按会有好几种状态，按住command键，点击UIGestureRecognizerStateBegan就能看到所有状态的枚举了，因为如果不加这句的话，此方法可能会被执行多次
return;//什么操作都不做，直接跳出此方法
}
//此处执行你想要执行的代码
// UIImage image = [[UIImage alloc] init];/当然此处需要拿到你需要保存的图片/
UIWindow window = [UIApplication sharedApplication].keyWindow;
//保存到图片库里面
UIImage image = [self snapshot:window/你要截取的视图/];
UIImageWriteToSavedPhotosAlbum(image, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);
//保存的指定的目录里面
// NSString * path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"蛋壳公众号.jpg"];
// [UIImagePNGRepresentation(image) writeToFile:path atomically:YES];
}
//把view转成image

• (UIImage *)snapshot:(UIView *)view
  {
  //保存全屏
  // UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0);
  // [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
  // UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  // UIGraphicsEndImageContext();
  //保存局部截图
  CGRect rect =self.view.frame;
  UIGraphicsBeginImageContext(rect.size);
  CGContextRef context = UIGraphicsGetCurrentContext();
  [self.view.layer renderInContext:context];
  UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  CGRect rect1 = CGRectMake(68 * KX , 140 * KY , 240 * KX , 240 * KY);
  UIImage * image = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([img CGImage], rect1)];
  return image;
  }
• (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
  {
  NSString *message = @"保存失败";
  if (!error) {
  message = @"成功保存到相册";
  }else
  {
  message = [error description];
  }
  NSLog(@"message is %@",message);

}