開源中國iOS客戶端學習——(七)MBProgressHUD特效

在開源中國iOS客戶端中也用到了MBProgressHUD這個特效，主要作用為應用顯示一個過渡的作用，常用于打開一個聯網頁面加載過程，防止出現假死現象，如果網速慢則告訴用戶已經在很努力很努力的加載中。

GitHub上下載地址：https://github.com/jdg/MBProgressHUD

源碼中也自帶了一個Demo,顯示13中動畫效果，可以根據需要選取其中特效加以使用，使用方法基本一樣；使用的時候只加把MBProgressHUD.h和MBProgressHUD.m拖入工程中，在使用的文件中加上#import"MBProgressHUD.h"

在開源中國iOS客戶端中只用到一種特效,當我們選取一條資訊查看詳細信息時：

我們在跳轉到實現的代碼部分，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":@"正在刪除收藏" 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:@"錯誤 %@",error.errorMessage] andView:self.view andLoading:NO andIsBottom:NO];                                     }                                         break;                                 }               } failure:^(AFHTTPRequestOperation *operation, NSError *error) {         [hud hide:YES];         [Tool ToastNotification:@"添加收藏失敗" andView:self.view andLoading:NO andIsBottom:NO];     }]; } 

- (void)viewDidLoad {     [super viewDidLoad];     self.tabBarItem.title = @"資訊詳情";     self.tabBarItem.image = [UIImage imageNamed:@"detail"];     //WebView的背景顏色去除     [Tool clearWebViewBackground:self.webView];          self.singleNews = [[SingleNews alloc] init];     self.navigationController.title = @"資訊詳情";     self.webView.delegate = self;     [self.webView loadHTMLString:@"" baseURL:nil];          if ([Config Instance].isNetworkRunning)      {         MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.view];         [Tool showHUD:@"正在加載" 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:@"加載失敗" andView:self.view andLoading:NO andIsBottom:NO];                 return;             }             [self loadData:self.singleNews];                          //如果有網絡 則緩存它             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:@"錯誤 網絡無連接" 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:@"錯誤 網絡無連接" andView:self.view andLoading:NO andIsBottom:NO];         }     } }  

首先是判斷網絡是否連通狀態，如果是

定義在當前的view中定義一個MBProgressHUD對象，進行初始化

[ToolshowHUD:@"正在加載" andView:self.viewandHUD:hud];是在Tool類里面進行的一次封裝，設置MBProgressHUD的顯示信息

+ (void)showHUD:(NSString *)text andView:(UIView *)view andHUD:(MBProgressHUD *)hud {     [view addSubview:hud];     hud.labelText = text;//顯示提示     hud.dimBackground = YES;//使背景成黑灰色，讓MBProgressHUD成高亮顯示     hud.square = YES;//設置顯示框的高度和寬度一樣     [hud show:YES]; }