ios学习(七)MBProgressHUD特效

来源：互联网发布：笔记本键盘测试软件编辑：程序博客网时间：2024/05/16 10:57

在开源中国iOS客户端中也用到了MBProgressHUD这个特效，主要作用为应用显示一个过渡的作用，常用于打开一个联网页面加载过程，防止出现假死现象，如果网速慢则告诉用户已经在很努力很努力的加载中。

GitHub上下载地址：https://github.com/jdg/MBProgressHUD

源码中也自带了一个Demo,显示13中动画效果，可以根据需要选取其中特效加以使用，使用方法基本一样；使用的时候只加把MBProgressHUD.h和MBProgressHUD.m拖入工程中，在使用的文件中加上#import"MBProgressHUD.h"

在开源中国iOS客户端中只用到一种特效,当我们选取一条资讯查看详细信息时：

我们在跳转到实现的代码部分，在NewsDetail.m的clickFavorite和viewDidLoad方法中

- (void)clickFavorite:(id)sender  {      UIBarButtonItem * btn = (UIBarButtonItem *)sender;      BOOL isFav = [btn.title isEqualToString:@"收藏此文"];        MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.view];      [Tool showHUD:isFav ? @"正在添加收藏":@"正在删除收藏" andView:self.view andHUD:hud];      [[AFOSCClient sharedClient]getPath:isFav ? api_favorite_add : api_favorite_delete                               parameters:[NSDictionary dictionaryWithObjectsAndKeys:                                          [NSString stringWithFormat:@"%d", [Config Instance].getUID],@"uid",                                          [NSString stringWithFormat:@"%d", newsID],@"objid",                                          @"4",@"type", nil] success:^(AFHTTPRequestOperation *operation, id responseObject) {                                                                    [hud hide:YES];                                  [Tool getOSCNotice2:operation.responseString];                                                              ApiError *error = [Tool getApiError2:operation.responseString];                                  if (error == nil) {                                      [Tool ToastNotification:operation.responseString andView:self.view andLoading:NO andIsBottom:NO];                                      return ;                                  }                                  switch (error.errorCode)                                   {                                      case 1:                                      {                                          btnFavorite.title = isFav ? @"取消收藏" : @"收藏此文";                                          self.singleNews.favorite = !self.singleNews.favorite;                                      }                                          break;                                      case 0:                                      case -2:                                      case -1:                                      {                                          [Tool ToastNotification:[NSString stringWithFormat:@"错误 %@",error.errorMessage] andView:self.view andLoading:NO andIsBottom:NO];                                      }                                          break;                                  }                  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {          [hud hide:YES];          [Tool ToastNotification:@"添加收藏失败" andView:self.view andLoading:NO andIsBottom:NO];      }];  }

- (void)viewDidLoad  {      [super viewDidLoad];      self.tabBarItem.title = @"资讯详情";      self.tabBarItem.image = [UIImage imageNamed:@"detail"];      //WebView的背景颜色去除      [Tool clearWebViewBackground:self.webView];            self.singleNews = [[SingleNews alloc] init];      self.navigationController.title = @"资讯详情";      self.webView.delegate = self;      [self.webView loadHTMLString:@"" baseURL:nil];            if ([Config Instance].isNetworkRunning)       {          MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.view];          [Tool showHUD:@"正在加载" andView:self.view andHUD:hud];                    NSString *url = [NSString stringWithFormat:@"%@?id=%d",api_news_detail, newsID];          [[AFOSCClient sharedClient] getPath:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {                            [Tool getOSCNotice2:operation.responseString];              [hud hide:YES];                            self.singleNews = [Tool readStrNewsDetail:operation.responseString];              if (self.singleNews == nil) {                  [Tool ToastNotification:@"加载失败" andView:self.view andLoading:NO andIsBottom:NO];                  return;              }              [self loadData:self.singleNews];                            //如果有网络 则缓存它              if ([Config Instance].isNetworkRunning)               {                  [Tool saveCache:1 andID:self.singleNews._id andString:operation.responseString];              }                        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {                            [hud hide:YES];              if ([Config Instance].isNetworkRunning) {                  [Tool ToastNotification:@"错误 网络无连接" andView:self.view andLoading:NO andIsBottom:NO];              }                        }];      }      else      {          NSString *value = [Tool getCache:1 andID:newsID];          if (value) {              self.singleNews = [Tool readStrNewsDetail:value];              [self loadData:self.singleNews];          }          else {              [Tool ToastNotification:@"错误 网络无连接" andView:self.view andLoading:NO andIsBottom:NO];          }      }  }

分析viewDidLoad方法，

首先是判断网络是否连通状态，如果是定义在当前的view中定义一个MBProgressHUD对象，进行初始化

[ToolshowHUD:@"正在加载" andView:self.viewandHUD:hud];是在Tool类里面进行的一次封装，设置MBProgressHUD的显示信息

+ (void)showHUD:(NSString *)text andView:(UIView *)view andHUD:(MBProgressHUD *)hud  {      [view addSubview:hud];      hud.labelText = text;//显示提示      hud.dimBackground = YES;//使背景成黑灰色，让MBProgressHUD成高亮显示      hud.square = YES;//设置显示框的高度和宽度一样      [hud show:YES];  }

然后在用到AFNetWork类库的getPath:parameters:success:failure:方法，嵌套在block块中判断请求的url是否成功，在执行[Tool getOSCNotice2:operation.responseString];这个方法也是封装在Tool类中，封装的是TBXML解析器，如果解析成功立即设置MBProgressHUD隐藏属性[hud hide:YES];如果请求的url不成功直接设置MBProgressHUD隐藏属性[hud hide:YES]，再用GCDiscreetNotificationView进行通知“错误网络无连接”;

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