布尔值的iPhone NSXML

Question

我正在通过读取XML文件http://www.calvaryccm.com/ServiceTimes.asmx/IsServiceTime来确定事件是否为实时事件。

它返回一个布尔结果，但是我不知道如何使用objective-c来访问它。这就是我到目前为止所知道的：

NSError * error = nil;
NSString * responseString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.calvaryccm.com/ServiceTimes.asmx/IsServiceTime"] encoding:NSUTF8StringEncoding error:&error];
NSLog(responseString);
if (error) {
    NSLog(@"%@", [error localizedDescription]);
}

if ([responseString isEqualToString:@"true"]) {
    // Handle active content.
    NSString *baseVideoUrl = @"http://streaming5.calvaryccm.com:1935/live/iPhone/playlist.m3u8";
    NSLog(@" finalUrl is : %@",baseVideoUrl);

    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:baseVideoUrl]];

    if ([moviePlayer respondsToSelector:@selector(setFullscreen:animated:)]) {  
        // Use the 3.2 style API  
        moviePlayer.controlStyle = MPMovieControlStyleDefault;  
        moviePlayer.shouldAutoplay = YES;  
        [self.view addSubview:moviePlayer.view];  
        [moviePlayer setFullscreen:YES animated:YES];  
    }

} else {
    // Inform user that the content is unavailable
    UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle: @"Live Service"
                          message: @"There is no service going on at this time"
                          delegate: nil
                          cancelButtonTitle:@"OK"
                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}

Answer 1

首先，你的NSLog语句应该是：

NSLog(@"%@", responseString); 

这将正确地注销响应字符串，然后您将获得此值(我刚刚尝试过)：

<?xml version="1.0" encoding="utf-8"?>
<boolean xmlns="http://tempuri.org/">false</boolean>

响应字符串不等于true，因为它是完全限定的XML字符串表示形式。您需要搜索字符串，您可以通过查找它是否包含文本"true“或"false”来执行此操作。

NSRange range = [responseString rangeOfString : @"true"];

if (range.location != NSNotFound) {
    //String contained true
}

或者，也可以使用像GDataXMLNode这样的轻量级XML解决方案。