ios视频截屏代码

//截屏static int i=0;-(IBAction)screenShot:(id)sender{        UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, 960), YES, 0);    [[self.window layer] renderInContext:UIGraphicsGetCurrentContext()];    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    CGImageRef imageRef = viewImage.CGImage;    CGRect rect =CGRectMake(166, 211, 426, 320);//这里可以设置想要截图的区域    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);    UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect];    UIImageWriteToSavedPhotosAlbum(sendImage, nil, nil, nil);//保存图片到照片库    NSData *imageViewData = UIImagePNGRepresentation(sendImage);        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = [paths objectAtIndex:0];    NSString *pictureName= [NSString stringWithFormat:@"screenShow_%d.png",i];    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:pictureName];    NSLog(@"%@", savedImagePath);    [imageViewData writeToFile:savedImagePath atomically:YES];//保存照片到沙盒目录    CGImageRelease(imageRefRect);    i++;}