+ (instancetype)captureWithView:(UIView *)view{    // 1.开启上下文    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);        // 2.将控制器view的layer渲染到上下文    [view.layer renderInContext:UIGraphicsGetCurrentContext()];        // 3.取出图片    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();        // 4.结束上下文    UIGraphicsEndImageContext();        return newImage;}