加在view上，dismiss后没有在view上移除导致内存泄漏 about wsprogresshud HOT 2 CLOSED

@implementation ViewController
{
    WSProgressHUD *hud; //添加为成员变量.
}

开始使用: ---------

   初始化:
    hud = [[WSProgressHUD alloc] initWithView:self.navigationController.view];
    [self.view addSubview:hud];

    //show hud
    [hud showWithString:@"Wating..." maskType:WSProgressHUDMaskTypeBlack];

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),      dispatch_get_main_queue(), ^{
        [hud dismiss];
    });

    [hud showImage:nil status:@"Success"];