#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //UIView

    UIView *view=[[UIView alloc]initWithFrame:CGRectMake(50, 100, 200, 50)];

    view.backgroundColor=[UIColor redColor];

    [self.view addSubview:view];

    //在UIImageView中显示截取的图片

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

    imageView.image=[self screenShotView:view];

    [self.view addSubview:imageView];

}

#pragma -mark -functions

// 对指定视图进行截图

- (UIImage *)screenShotView:(UIView *)view

{

    UIImage *imageRet = nil;

    if (view)

    {

        if(UIGraphicsBeginImageContextWithOptions)

        {

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

        }

        else

        {

            UIGraphicsBeginImageContext(view.frame.size);

        }

        //获取图像

        [view.layer renderInContext:UIGraphicsGetCurrentContext()];

        imageRet = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

    }else{

    }

    return imageRet;

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}