iOS ● 点击截屏

- (void) Screener
{
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0.0);
    
    //截屏带导航栏
    [self.navigationController.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    //截屏不带导航栏
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    //image为截图 , 可以用来分享
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    //保存到手机相册
    UIImageWriteToSavedPhotosAlbum(image, nil, nil,nil);
}