截屏到相册

//1.创建按钮

UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 50, 50)];

    [button setTitle:@"截屏" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(tap:) forControlEvents:UIControlEventTouchUpInside];

    button.backgroundColor = [UIColor redColor];

    [self.view addSubview:button];

 //2.按钮点击事件    

- (void)tap:(UIButton *)sender{

    // 1.截取全屏

        //上下文大小

    UIGraphicsBeginImageContext(self.view.bounds.size);

        //获取上下文

    CGContextRef context = UIGraphicsGetCurrentContext();

        //渲染 实时绘图

    [self.view.layer renderInContext:context];

        //取出图片

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

        //关闭上下文

    UIGraphicsEndImageContext();

    

        // 把图片保存到相册

    UIImageWriteToSavedPhotosAlbum(image,nil, nil, nil);

    

}

效果图