iOS图层截图

/**
 *  方法captureWithView：
 *
 *  @param view 传入要截图的view
 *
 *  @return 返回截取的图片
 */

+ (instancetype)captureWithView:(UIView *)view

{
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);

    //将view的layer渲染到上下文
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    //取得图像
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    //关闭上下文
    UIGraphicsEndImageContext();
    
    return newImage;
}