截图

 CGSize s = theView.bounds.size;
    UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);
    [theView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;

 CGSize s = theView.bounds.size;
    UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);
    [theView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;