ios11在键盘弹起和UIAlertController出现之后会出现一个UITextEffectsWindow且不消失了，内部包含UIInputSetContainerView->UIInputSetHostView(高度：258)，SVProgressHuB为了适配键盘弹起，会遍历window获取这个window及其中UIInputSetHostView的高度以调整hudView的center,这样就会造成huvView之后一直不居中。
那么我们应该怎么解决呢？我是用的办法是：判断UIInputSetHostView是否在window中，如果在则在调起SVProgressHUD提示框时，设置一下其相对于中心点的偏移量:

#define SHOWSUCCESS_SVP_STRING(str) dispatch_async(dispatch_get_main_queue(),^{\
[SVProgressHUD setDefaultStyle:SVProgressHUDStyleDark];\
[SVProgressHUD setSuccessImage:nil];\
[SVProgressHUD showSuccessWithStatus:str];\
[SVProgressHUD dismissWithDelay:1.5f];\
if ([CommonTools adjustSVProgressHuDHudViewCenter] > 0){\
[SVProgressHUD setOffsetFromCenter:UIOffsetMake(0, (-CGRectGetHeight(UIApplication.sharedApplication.statusBarFrame) + [CommonTools adjustSVProgressHuDHudViewCenter]) * 0.45)];\
}\
});

判断及获取UIInputSetHostView高度的代码<同SVProgressHUD内部的代码，SVProgressHUD.m文件 1328行>：

+(CGFloat)adjustSVProgressHuDHudViewCenter{
    UIWindow *keyboardWindow = nil;
    for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) {
        if(![[testWindow class] isEqual:[UIWindow class]]) {
            keyboardWindow = testWindow;
            break;
        }
    }
    for (__strong UIView *possibleKeyboard in [keyboardWindow subviews]) {
        if([possibleKeyboard isKindOfClass:NSClassFromString(@"UIPeripheralHostView")] || [possibleKeyboard isKindOfClass:NSClassFromString(@"UIKeyboard")]) {
            return CGRectGetHeight(possibleKeyboard.bounds);
        } else if([possibleKeyboard isKindOfClass:NSClassFromString(@"UIInputSetContainerView")]) {
            for (__strong UIView *possibleKeyboardSubview in [possibleKeyboard subviews]) {
                if([possibleKeyboardSubview isKindOfClass:NSClassFromString(@"UIInputSetHostView")]) {
                    return CGRectGetHeight(possibleKeyboardSubview.bounds);
                }
            }
        }
    }
    return 0;
}