ios学习(七)MBProgressHUD特效

Java架构师必看

发布于 2021-05-31 15:34:36

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代码可运行

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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