IOS之MBProgressHUD特效学习

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”;