获取指定区域的屏幕截图

-(UIImage *)fullScreenshotsWithFrame:(CGRect)frame{
    
    UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];
    
    UIGraphicsBeginImageContext(screenWindow.frame.size);//全屏截图，包括window
    
    [screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    UIImage *viewImage =UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
//    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
    
    float originX =frame.origin.x;
    float originy =frame.origin.y;
    float width =frame.size.width;
    float height =frame.size.height;
    //你需要的区域起点,宽,高;
    
    CGRect rect1 =CGRectMake(originX , originy , width , height);
    
    UIImage * imgeee = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([viewImage CGImage], rect1)];

}