IOS为每个网请求添加进度标示

UIViewController的子类，且只有界面才有必要现实进度标示。然后在网络请求的开始和结束调用这个方法

1. 基于 UIViewController做扩展

#import
 
@implementation
 
void)showProgress
 {
   NSLog(@"=======showProgress=========");
  MBProgressHUD *progressHUD = [[[MBProgressHUD alloc]initWithView:self.view] autorelease];
   
   progressHUD.minSize = CGSizeMake(120, 120);
   progressHUD.minShowTime = 0.3;
   progressHUD.tag = 9999;
   [self.view addSubview:progressHUD];
   
   [self.view bringSubviewToFront:progressHUD];
   progressHUD.layer.masksToBounds = YES;
   progressHUD.layer.cornerRadius = 10.0;
   progressHUD.labelText = @"加载中...";
  mode = MBProgressHUDModeIndeterminate;
   [progressHUD show:YES];
   
   
   self.navigationController.navigationBar.userInteractionEnabled = NO;
 }
 
void)hideProgress
 {
   NSLog(@"=======hideProgress=========");
  UIView *progressHUD =  [self.view viewWithTag:9999];
  if
  
       [progressHUD removeFromSuperview];
  
 }
 @end

2. 在网络请求开始地方调用方法

NetworkCenter中调用

在网络创建，加入请求队列之前调用，显示进度标示

if(responseDelegate && [responseDelegate respondsToSelector:@selector(showProgress)])
{
      responseDelegate showProgress];
}

在网络请求成功、失败、网络异常调用，隐藏进度标示

if(responseDelegate && [responseDelegate respondsToSelector:@selector(hideProgress)])
{
      responseDelegate hideProgress];
}