截取某张图片的一部分

+(UIImage*)getImageWith:(UIImage*)image _rect:(CGRect)rect{

    UIImageView *__imageview = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0, 320,__gScreenHeight+20)];

    __imageview.image = image;

    //截图

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, (__gScreenHeight+20)*2),YES, 0);

    [__imageview.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    CGImageRef imageRef = viewImage.CGImage;

    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);

    UIImage *sendImage = [[UIImagealloc] initWithCGImage:imageRefRect];

    CGImageRelease(imageRefRect);

    [__imageview release];

    return [sendImage autorelease];

}

-(void)reReFreshBottomTheme{

    NSUserDefaults *storeTheme = [NSUserDefaults standardUserDefaults];

    NSData *__themeImageData = [storeTheme objectForKey:kETThemeCurrentThemeImg];

    if (nil == __themeImageData) {

        m_bottomBgView.image = [UtilsManager getImageWith:[UIImage imageNamed:@"bg_0.jpg"] _rect:CGRectMake(0, 2*__gScreenHeight-2*44, 640, 44*2)];

    }else{

        m_bottomBgView.image = [UtilsManager getImageWith:[UIImage imageWithData:__themeImageData] _rect:CGRectMake(0, 2*__gScreenHeight-2*44, 640, 44*2)];

    }

}