ios - 尝试在 for 循环中调用 PList 数据(iOS)

Question

我有，我认为这是一个简单的问题和一个简单的答案，但我一生都无法弄清楚。我创建了一个 plist，我试图用它来填充带有信息的 MapView 注释。我已经阅读了一些教程，这是我决定使用的代码(运行一个循环)。

它没有在 map 上显示引脚，所以我决定在整个代码的不同点设置 NSLogs 以查找问题，如果您查看下面的代码，它会记录“read1”而不是“read2”所以它实际上是循环开头某处的问题。

- (void)viewDidLoad
{
    NSMutableArray *annotations = [[NSMutableArray alloc]init];
    NSString *path = [[NSBundle mainBundle] pathForResource:@"MillersStores" ofType:@"plist"];
    NSMutableArray *anns = [[NSMutableArray alloc] initWithContentsOfFile:path];
    NSLog(@"read1");
    for(int i = 0; i < [anns count]; i++) {
        NSLog(@"read2");
        float realLatitude = [[[anns objectAtIndex:i] objectForKey:@"Latitude"] floatValue];
        float realLongitude = [[[anns objectAtIndex:i] objectForKey:@"Longitude"] floatValue];
        NSLog(@"read3");

        MillersLocations *myAnnotation = [[MillersLocations alloc] init];
        CLLocationCoordinate2D theCoordinate;
        theCoordinate.latitude = realLatitude;
        theCoordinate.longitude = realLongitude;
        myAnnotation.coordinate = theCoordinate;
        myAnnotation.title = [[anns objectAtIndex:i] objectForKey:@"Title"];
        myAnnotation.subtitle = [[anns objectAtIndex:i] objectForKey:@"Address"];
        [mapView addAnnotation:myAnnotation];
        [annotations addObject:myAnnotation];
        [myAnnotation release];
    }
}

我似乎时不时会出现一些简单的语法错误，所以我认为这可能与这些错误有关。感谢您的帮助!

--

编辑

这是我的 PList 文件的一些 XML 代码:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Root</key>
    <array>
        <dict>
            <key>Title</key>
            <string>Neighborhood Market #90</string>
            <key>Address</key>
            <string>5117 Mudd Tavern Rd., Thornburg, VA 22580</string>
            <key>Latitude</key>
            <real>38.133069</real>
            <key>Longitude</key>
            <real>-77.512423</real>
            <key>Phone Number</key>
            <string>(757) 874-5806</string>
        </dict>
        <dict>
            <key>Title</key>
            <string>Neighborhood Market #89</string>
            <key>Address</key>
            <string>4902 Hampton Blvd., Norfolk, VA 23508</string>
            <key>Latitude</key>
            <real>36.887794</real>
            <key>Longitude</key>
            <real>-76.302544</real>
            <key>Phone Number</key>
            <string>(757) 440-7792</string>
        </dict>
        <dict>
            <key>Title</key>
            <string>Neighborhood Market #88</string>
            <key>Address</key>
            <string>7601 Sunset Crossing Dr., Gainesville, VA 20155</string>
            <key>Latitude</key>
                <real>38.792053</real>
            <key>Longitude</key>
            <real>-77.62994399999999</real>
            <key>Phone Number</key>
            <string>(571) 248-8580</string>
        </dict>

Answer 1

plist 实际上在顶层包含一个字典，其中有一个键“Root”，其值是您感兴趣的数组。因此您必须将文件读入 NSDictionary，然后检索其中的数组。

替换这一行:

NSMutableArray *anns = [[NSMutableArray alloc] initWithContentsOfFile:path];

这些:

NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
NSArray *anns = [dict objectForKey:@"Root"];