【代码笔记】对UIView进行截图

一，效果图。

二，工程图。

三，代码。

RootViewController.m

#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.
}