//再截屏
UIGraphicsBeginImageContextWithOptions(contentImageView.bounds.size, NO, 0);
CGContextRef ctx1 = UIGraphicsGetCurrentContext();
[contentView.layer renderInContext:ctx1];
// 这个是要分享图片的样式(自定义的)
UIImage * newImage1 = UIGraphicsGetImageFromCurrentImageContext();
//保存到本地相机
UIImageWriteToSavedPhotosAlbum(newImage1,self,@selector(image:didFinishSavingWithError:contextInfo:),nil);
//裁剪截屏后的图片
//拿到这张图，然后再裁剪吊左边的灰色部分
UIGraphicsBeginImageContext(newImage1.size);
[newImage1 drawInRect:CGRectMake(20,0,newImage1.size.width,newImage1.size.height)];
UIImage *new2Image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *img2 = [[UIImageView alloc] init];
[img2 setImage:new2Image];
self.mergeImage = img2.image;
img2.frame = CGRectMake(-30, 0, XHW_W-20 , h);
[contentImageView addSubview:img2];
//拿到这张图，然后再裁剪吊左边的灰色部分
