- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //初始化界面

    [self addView];

}

#pragma -mark -functions

//初始化界面

-(void)addView

{

    UIImage *image = [self screenshot:UIDeviceOrientationPortrait

                             isOpaque:YES

                 usePresentationLayer:YES];

    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];

    imageView.backgroundColor=[UIColor redColor];

    imageView.image=image;

    [self.view addSubview:imageView];

}

//截屏功能

- (UIImage *)screenshot:(UIDeviceOrientation)orientation isOpaque:(BOOL)isOpaque usePresentationLayer:(BOOL)usePresentationLayer

{

    CGSize size;

    if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) {

        size = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);

    } else {

        size = CGSizeMake(self.view.frame.size.height, self.view.frame.size.width);

    }

    UIGraphicsBeginImageContextWithOptions(size, isOpaque, 0.0);

    if (usePresentationLayer) {

        [self.view.layer.presentationLayer renderInContext:UIGraphicsGetCurrentContext()];

    } else {

        [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

    }

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}