从plist创建坐标对象

时间:2011-09-04 17:12:59

标签: objective-c annotations plist coordinates

我正在尝试从plist加载注释并在地图上显示,但遇到问题:

a)动态分配坐标,和
b)在地图上显示它们。

当我在物理上分配纬度和长度时:

tempCoordinate.latitude = 53.381164;
tempCoordinate.longitude = -1.471798;

地图是用注释绘制的,但它似乎将它们全部绘制在同一个地方?

我一直试图解决这个问题很久了,还有更好的方法吗?任何帮助将不胜感激。我开始考虑手动将它们全部输入为对象。

这是我的plist ....

我想制作两种类型的注释,每种注释都创建为对象,然后添加到单独的数组中,以便我可以在地图视图上切换它们。

这是我的annotations.h课程:

@property (copy) NSString *streetName;
@property (copy) NSString *bays;
@property (copy) NSString *type;

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

- (id)initWithAnnotationName:(NSString *)newStreetName               
                     theBays:(NSString *)newBays                
                     theType:(NSString *)newType
               theCoordinate:(CLLocationCoordinate2D)newCoordinate;

这里是annotations.m:

if ((self = [super init])) {       

        type = [newType copy];
        streetName = [newStreetName copy];        
        bays = [newBays copy];
        coordinate = newCoordinate;        
    }

这是mapView.h

parkingArray1 = [[NSMutableArray alloc] init];
//NSMutableArray *testArr = [[NSMutableArray alloc] init];

//path of plist
NSString *fullPathToPList=[[NSBundle mainBundle] pathForResource:@"AnnotationList" ofType:@"plist"];

//temp values for dictionary enumeration and creating annotation object
NSDictionary *plistDict, *BlueBadgeDict, *BlueBadgeContentsDict;

plistDict = [NSDictionary dictionaryWithContentsOfFile: fullPathToPList];

//enumerate through BlueBadge dictionary
BlueBadgeDict = [plistDict valueForKey: @"BlueBadge"];

for (NSString *firstLevelString in BlueBadgeDict){

    BlueBadgeContentsDict = [BlueBadgeDict valueForKey:firstLevelString];

    NSString *tempStreetName, *tempBays, *tempType, *tempLat, *tempLong;
    CLLocationCoordinate2D tempCoordinate;

    for (NSString *secondLevelString in BlueBadgeContentsDict){

        //assign temp values from dict to string
        if ([secondLevelString isEqualToString:@"StreetName"])
            tempStreetName = [BlueBadgeContentsDict valueForKey:secondLevelString];
        else if ([secondLevelString isEqualToString:@"Bays"])
            tempBays = [BlueBadgeContentsDict valueForKey:secondLevelString];
        else if ([secondLevelString isEqualToString:@"Longitude"])
            tempLong = [BlueBadgeContentsDict valueForKey:secondLevelString];
        else if ([secondLevelString isEqualToString:@"Latitude"])
            tempLat = [BlueBadgeContentsDict valueForKey:secondLevelString];             
    }

    //pass plist root value
    tempType = firstLevelString;

    tempCoordinate.latitude = [tempLat doubleValue];
    tempCoordinate.longitude = [tempLong doubleValue];

    //create object
    Annotation *tempAnnotation = [[Annotation alloc] initWithAnnotationName:tempStreetName theBays:tempBays theType:tempType theCoordinate:tempCoordinate];

    //add the object to the mutable array
    [parkingArray1 addObject:tempAnnotation];

    [tempAnnotation release];       

}

//display array on map    
[self.mapView addAnnotations:parkingArray1];

这是xml代码

<dict>
    <key>BlueBadge</key>
    <dict>
    <key>BB1</key>
    <dict>
        <key>Bays</key>
        <string>4</string>          
        <key>Latitude</key>
        <string>-1.466822</string>
        <key>Longitude</key>
        <string>53.37725</string>           
        <key>StreetName</key>
        <string>Arundel Lane</string>
    </dict>
    <key>BB2</key>
    <dict>
        <key>Bays</key>
        <string>5</string>          
        <key>Latitude</key>
        <string>-1.471994</string>
        <key>Longitude</key>
        <string>53.381071</string>          
        <key>StreetName</key>
        <string>Balm Green</string>
    </dict>
    <key>BB3</key>
    <dict>
        <key>Bays</key>
        <string>1</string>          
        <key>Latitude</key>
        <string>-1.466739</string>
        <key>Longitude</key>
        <string>53.374164</string>          
        <key>StreetName</key>
        <string>Brittain Street</string>
    </dict>
</dict>
</dict>

2 个答案:

答案 0 :(得分:1)

代码似乎没问题。

我看到的唯一问题是plist中的坐标是向后的。

例如,BB1位于纬度-1和经度53位于印度洋的某个地方。

如果停车场实际上在英国谢菲尔德,请翻转plist中的坐标。

答案 1 :(得分:0)

我可以看到代码中的错误。

1你需要像这样使用for循环中的数组

NSArray *array = [BlueBadgeContentsDict allKeys];

for(NSString *secondLevelString in array)
{
     .....
}

2而不是这个

tempCoordinate.longitude = [tempLat doubleValue];

你需要这样做

tempCoordinate.longitude = [tempLong doubleValue];