iOS网络编程-MBProgressHUD等待指示器

第三方的等待指示器，MBProgressHUD就是第三方提供的等待指示器框架。下面是MBProgressHUD提供的等待指示器样式，它们基本可以分为：未知结束时间和已知结束时间两大类等待指示器，在MBProgressHUD中可以为等待指示器添加标签和详细标签

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MBProgressHUD的下载地址是https://github.com/matej/MBProgressHUD，我们将下载的源文件中的MBProgressHUD.h和MBProgressHUD.m拷贝到自己的工程中，MBProgressHUD依赖的框架有：Foundation.framework、UIKit.framework和CoreGraphics.framework，我们需要将这些框架添加到工程中。

我们为应用添加MBProgressHUD等待指示器，修改主视图控制器MasterViewController.m的startRequest方法代码如下，注意加粗部分：

-(void)startRequest

{

    //初始化MBProgressHUD

    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];

    hud.mode = MBProgressHUDModeCustomView;

    hud.labelText = @”Loading”;

NSString *strURL = [[NSString alloc]

initWithFormat:@”http://iosbook3/mynotes/webservice.php”];

NSURL *url = [NSURL URLWithString:[strURL URLEncodedString]];

NSString *post;

if (action == ACTION_QUERY) {//查询处理

post = [NSString stringWithFormat:@"email=%@&type=%@&action=%@",

@"<你的iosbook1.com用户邮箱>",@"JSON",@"query"];

} else if (action == ACTION_REMOVE) {//删除处理

NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];

NSMutableDictionary*  dict = self.listData[indexPath.row];

post = [NSString stringWithFormat:@"email=%@&type=%@&action=%@&id=%@",

@"<你的iosbook1.com用户邮箱>",@"JSON",@"remove",[dict objectForKey:@"ID"]];

}

NSData *postData  = [post dataUsingEncoding:NSUTF8StringEncoding];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];

[request setHTTPBody:postData];

NSURLConnection *connection = [[NSURLConnection alloc]

initWithRequest:request delegate:self];

if (connection) {

_datas = [NSMutableData new];

}

}

-(void) connection:(NSURLConnection *)connection didFailWithError: (NSError *)error {

NSLog(@”%@”,[error localizedDescription]);

[MBProgressHUD hideHUDForView:self.view animated:YES];

}

 

- (void) connectionDidFinishLoading: (NSURLConnection*) connection {

NSLog(@”请求完成…”);

NSDictionary* dict = [NSJSONSerialization JSONObjectWithData:_datas

options:NSJSONReadingAllowFragments error:nil];

if (action == ACTION_QUERY) {//查询处理

[self reloadView:dict];

} else if (action == ACTION_REMOVE) {//删除处理

NSString *message = @”操作成功。”;

NSNumber *resultCodeObj = [dict objectForKey:@"ResultCode"];

if ([resultCodeObj integerValue] < 0) {

message = [resultCodeObj errorMessage];

}

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@”提示信息”

message:message

delegate:nil

cancelButtonTitle:@”OK”

otherButtonTitles: nil];

[alertView show];

//重新查询

action = ACTION_QUERY;

[self startRequest];

}

 [MBProgressHUD hideHUDForView:self.view animated:YES];

}