IOS开发—截屏

标签：ios开发   截屏   

- (void)actionShot:(UIButton *)sender{
    
    //可以隐藏按钮，渲染完后显示回来
    self.buttonShot.hidden =YES;
    
    //创建图形上下文
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(self.view.frame.size.width,self.view.frame.size.height),NO, 0);
    //获取图形上下文并将当前屏幕渲染到图形上下文上
    AppDelegate *delegate = (AppDelegate *)[UIApplicationsharedApplication].delegate;
    [delegate.window .layerrenderInContext:UIGraphicsGetCurrentContext()];
    //从图形上下文中取出绘制好的图片
    UIImage *screenImage =UIGraphicsGetImageFromCurrentImageContext();
    //关闭图形上下文
    UIGraphicsEndImageContext();
    
    self.buttonShot.hidden =NO;
    
//    //截屏完毕有时候可能想获取屏幕中指定区域的图片，如下操作
//    //得到截屏的cgimage
    CGImageRef image = screenImage.CGImage;
    
    //设置目标区域,注意这里需要考虑retina分辨率的放大倍数，以iphone6plus为例，在原尺寸的基础上*3，这里就不判断了。
    CGRect rect =CGRectMake(0,0, screenImage.size.width*3, screenImage.size.height*3);
    //取出目标区域的图片
    CGImageRef targetImage =CGImageCreateWithImageInRect(image, rect);
    //最终图片
    UIImage *finalImage = [UIImageimageWithCGImage:targetImage];

    //保存到相册
    UIImageWriteToSavedPhotosAlbum(finalImage,self, @selector(image: didFinishSavingWithError:contextInfo:),nil);
    
    //保存到沙盒
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES)firstObject];
    NSDateFormatter *dateFormatter = [[NSDateFormatteralloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *currentTime = [dateFormatterstringFromDate:[NSDatedate]];
    NSString *imagePath = [pathstringByAppendingPathComponent:[NSStringstringWithFormat:@"ScreenShot_%@",currentTime]];
    NSData *imageDate =UIImagePNGRepresentation(finalImage);
    [imageDate writeToFile:imagePathatomically:YES];
    
    CGImageRelease(targetImage);
}

//保存至相册后的回调
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo
{
    NSString *msg =nil ;
    if(error !=NULL){
        msg = @"保存图片失败" ;
    }else{
        msg = @"保存图片成功" ;
    }
    UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@"保存图片结果提示"
                                                   message:msg
                                                  delegate:self
                                          cancelButtonTitle:@"确定"
                                          otherButtonTitles:nil];
    [alert show];
}

IOS开发—截屏

标签：ios开发   截屏   

原文地址：http://blog.csdn.net/lotheve/article/details/47619755