设置白色菊花 改变加载圈大小

//设置加载圈
- (void)initMBProgressHUD {
    self.hud = [[MBProgressHUD alloc] initWithView:self.view];
    _hud.delegate = self;
    _hud.mode = MBProgressHUDModeIndeterminate;
    _hud.bezelView.style = MBProgressHUDBackgroundStyleSolidColor;
    _hud.bezelView.backgroundColor = [UIColor blackColor];
    //设置菊花框为白色
    [UIActivityIndicatorView appearanceWhenContainedIn:[MBProgressHUD class], nil].color = [UIColor whiteColor];
    _hud.square = YES;//等宽高
    _hud.margin = 7;//修改该值，可以修改加载框大小
    _hud.removeFromSuperViewOnHide = YES;
    [_hud showAnimated:YES];
    
    [self.view addSubview:_hud];
}