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”;