iPhone NSXML解析器的布尔值

Question

我正在通过从XML文件http://www.calvaryccm.com/ServiceTimes.asmx/IsServiceTime读取来确定事件是否正在直播。

它返回一个布尔结果，但是我无法弄清楚如何使用Objective-C访问它。 这是我到目前为止的内容：

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，您的NSLog语句应为：

NSLog(@"%@", responseString); 

这将正确注销响应字符串，然后您将获得该值（我刚刚尝试过）：

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

您的响应字符串不等于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，可以通过查找字符串是否包含文本“ true”或“ false”来实现。

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

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

或者，您可以使用轻量级的XML解决方案，例如GDataXMLNode