UIView截图

- (IBAction)displayImage:(id)sender {

UIImageView *view=[[UIImageView alloc]initWithImage:[self getImageWithView:self.view]];

view.frame=CGRectMake(100, 100, 100, 100);

[self.view addSubview:view];

}

// 从view上截图

- (UIImage *)getImageWithView:(UIView *)view {

UIGraphicsBeginImageContextWithOptions(CGSizeMake(150, 150), NO, 1.0); //NO，YES 控制是否透明

[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

// 生成后的image

return image;

}

//在scrollView上截图

- ( UIImage *)getCapture
{
   

    UIImage* viewImage = nil;

    UITableView *scrollView = self.tableView ;

    UIGraphicsBeginImageContextWithOptions (scrollView. contentSize , scrollView. opaque , 0.0 );
    {
        CGPoint savedContentOffset = scrollView. contentOffset ;
        CGRect savedFrame = scrollView. frame ;
       
        scrollView. contentOffset = CGPointZero ;
        scrollView. frame = CGRectMake ( 0 , 0 , scrollView. contentSize . width , scrollView. contentSize . height );
       
        [scrollView. layer renderInContext : UIGraphicsGetCurrentContext ()];
        viewImage = UIGraphicsGetImageFromCurrentImageContext ();
       
        scrollView. contentOffset = savedContentOffset;
        scrollView. frame = savedFrame;
    }
    UIGraphicsEndImageContext ();
   
    return viewImage;

}