iOS截屏耗性能最低的方法(限越狱手机)

//截屏 过滤掉自定义的window
+(void)createScreenShot:(NSString *)account withPicName:(NSString *)picName WithScale:(CGFloat)scale byFilter:(UIWindow *)window {
    //过滤掉小window
    [UIView animateWithDuration:0.005 animations:^{
        window.alpha=0.0;
    } completion:^(BOOL finished) {
        [self createScreenShot:account withPicName:picName WithScale:scale WithCompress:0.3];
        window.alpha=1.0;
    }];
}

//截取小图（自定义路径）
+(void)keepScreenShotWithSmallPicName:(NSString *)name  WithImageOfSmallRect:(CGRect)frame fileDir:(NSString *)dir WithScale:(CGFloat)scale
{
    UIImage * image=[self getImageWithFullScreenshot:scale];//大图
    CGRect rect=frame;
    CGImageRef sourceImageRef = [image CGImage];
    CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);
    UIImage * newImage = [UIImage imageWithCGImage:newImageRef];//小图
    CGImageRelease(newImageRef);
    UIGraphicsEndImageContext();
    NSData * smallScreenData =UIImagePNGRepresentation(newImage);
//保存起来
    [XLHelpClass writeFileContentNsData:[NSString stringWithFormat:@"%@",dir] withName:name withData:smallScreenData];
}

//截取全屏视图
+(UIImage *)getImageWithFullScreenshot:(CGFloat )scale
{
    
    UIView * view = [[UIScreen mainScreen] snapshotViewAfterScreenUpdates:NO];
    CGRect mainRect = view.bounds;
    BOOL isLandScape = NO;
    if(mainRect.size.width > mainRect.size.height){
        isLandScape = YES;
    }
    UIGraphicsBeginImageContextWithOptions(mainRect.size, NO, scale);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        
        NSString *sss=[NSString stringWithFormat:@"%@",window];
        //NSLog(@"getImageWithFullScreenshot=====%@==",sss);
        if([sss rangeOfString:@"FBRootWindow"].location !=NSNotFound){
        //NSLog(@"===FBRootWindow===");
        /*if(((window.bounds.size.width == mainRect.size.width&&
           window.bounds.size.height == mainRect.size.height)
           ||(window.bounds.size.width == mainRect.size.height&&
              window.bounds.size.height == mainRect.size.width))&&(window.hidden==NO)&&([window isKindOfClass:[UIWindow class]])){*/
               CGContextSaveGState(context);
               if(isLandScape){
                   //home 键在右
                   CGContextRotateCTM(context, (CGFloat)(-M_PI_2));
                   CGContextTranslateCTM(context, -mainRect.size.height, 0);
                   //home 键在左
                   //CGContextRotateCTM(context, (CGFloat)(-M_PI_2*3));
                   //CGContextTranslateCTM(context,0, -mainRect.size.width);
               }
               if([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
                   [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:NO];
               else
                   [window.layer renderInContext:UIGraphicsGetCurrentContext()];

               CGContextRestoreGState(context);
        }
    }
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}