嘿fellas，所以我能够从找到的源代码at this link（以及下面注释掉的代码帖子中）显示注释（2）。
但是，我从plist加载注释信息并将其正确加载（通过调试器确认）到mapView中，但出于某种原因，当我在模拟器中运行应用程序时，注释拒绝显示。以下是相关代码：
注释标题：
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface ArboretumAnnotation : NSObject <MKAnnotation> {
NSString *title;
NSString *subtitle;
UIImage *image;
CLLocationCoordinate2D coordinate;
}
@property (nonatomic, retain) NSString *title;
@property (nonatomic, retain) NSString *subtitle;
@property (nonatomic, retain) UIImage *image;
@property (nonatomic) CLLocationCoordinate2D coordinate;
@end
注释实现：
#import "ArboretumAnnotation.h"
@implementation ArboretumAnnotation
@synthesize title;
@synthesize subtitle;
@synthesize image;
@synthesize coordinate;
-(id)init{
self = [super init];
if(!self)
return nil;
self.title = nil;
self.subtitle = nil;
self.image = nil;
return self;
}
-(id)initWithCoordinate:(CLLocationCoordinate2D)inCoord{
self = [self init];
self.coordinate = inCoord;
return self;
}
@end
MapViewController标题：
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface MapViewController : UIViewController <MKMapViewDelegate> {
MKMapView *mapView;
}
@property (nonatomic, retain) IBOutlet MKMapView *mapView;
- (void)showCurrentLocationButtonTapped:(id)sender;
- (void)loadAnnotations; //helper function that loads all overlay data from plist
- (void)loadOverlays; //helper function that loads all overlay data from plist
- (void)handleGesture:(UILongPressGestureRecognizer *)gestureRecognizer;
@end
MapViewController实现：
#import "MapViewController.h"
#import "MKMapView+ZoomLevel.h"
#import "ArboretumRegionOverlay.h"
#import "ArboretumAnnotation.h"
#import "ArboretumAnnotationView.h"
#import "LocationDetailViewController.h"
#define UCD_LATITUDE 38.531728
#define UCD_LONGITUDE -121.755327
@implementation MapViewController
@synthesize mapView;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
//mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
mapView.delegate = self;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Location Info" style:UIBarButtonItemStylePlain target:self action:nil];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:100 target:self action:@selector(showCurrentLocationButtonTapped:)];
[self loadAnnotations];
[self loadOverlays];
[mapView setNeedsDisplay];
/*
//TEST LOAD AN ANNOTATION
//MKPointAnnotation *testAnnot = [[MKPointAnnotation alloc] init];
ArboretumAnnotation *arboAnnot = [[ArboretumAnnotation alloc] init];
CLLocationCoordinate2D workingCoord;
workingCoord.latitude = 38.529977;
workingCoord.longitude = -121.76;
[arboAnnot setCoordinate:workingCoord];
[arboAnnot setTitle:@"Test Title"];
[arboAnnot setSubtitle:@"Test Subtitle"];
[mapView addAnnotation:arboAnnot];
[arboAnnot release];
ArboretumAnnotation *arboAnnot2 = [[ArboretumAnnotation alloc] init];
CLLocationCoordinate2D workingCoord2;
workingCoord2.latitude = 38.531594;
workingCoord2.longitude = -121.762129;
[arboAnnot2 setCoordinate:workingCoord2];
[arboAnnot2 setTitle:@"Test A really really really really long title Title2"];
[arboAnnot2 setSubtitle:@"Test A really really really really long sub Subtitle2"];
[mapView addAnnotation:arboAnnot2];
[arboAnnot2 release];
*/
//detects press gestures used for producing region overlay callout
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:@selector(handleGesture:)];
lpgr.minimumPressDuration = 0.3; //user must press for 1 second
//[mapView addGestureRecognizer:lpgr];
[lpgr release];
//initialize the map view (location and zoom)
CLLocationCoordinate2D centerCoord = { UCD_LATITUDE, UCD_LONGITUDE };
[mapView setCenterCoordinate:centerCoord zoomLevel:13 animated:NO];
}
- (void)showCurrentLocationButtonTapped:(id)sender {
NSLog(@"Showing current location.");
if ([mapView showsUserLocation] == NO) {
[mapView setShowsUserLocation:YES];
}
[mapView setCenterCoordinate:mapView.centerCoordinate zoomLevel:13 animated:YES];
}
- (void)loadAnnotations{
//retrieve path of plist file and populate relevant types with its information
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"ArboretumGardens" ofType:@"plist"];
NSDictionary *rootOfArboDataPlistDict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
NSMutableArray *arboAnnotations = [[NSMutableArray alloc] init];
for (NSString *key in rootOfArboDataPlistDict) {
NSMutableDictionary *arboDict = [rootOfArboDataPlistDict objectForKey:key];
//array containing annotation information: latitude, longitude, title, subtitle(see PermitData.plist)
NSArray *annotationsArray = [arboDict objectForKey:@"annotations"];
CLLocationCoordinate2D workingCoordinate;
//loop through annotations array, creating parking annotations filled with the information found in the plist
for(NSDictionary *annotationContainerDict in annotationsArray){
ArboretumAnnotation *arboAnnot = [[ArboretumAnnotation alloc] init];
workingCoordinate.latitude = [[annotationContainerDict objectForKey:@"latitude"] doubleValue];
workingCoordinate.longitude = [[annotationContainerDict objectForKey:@"longitude"] doubleValue];
[arboAnnot setCoordinate:workingCoordinate];
[arboAnnot setTitle:[annotationContainerDict objectForKey:@"title"]];
[arboAnnot setSubtitle:[annotationContainerDict objectForKey:@"subtitle"]];
[arboAnnotations addObject:arboAnnot];
[arboAnnot release];
}//for
}//for
[mapView addAnnotations:arboAnnotations];
[arboAnnotations release];
}
//...
- (ArboretumAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:MKUserLocation.class]) {
//it's the built-in user location annotation(blue dot)
return nil;
}
NSString *annotIdentifier = @"annotation";
MKPinAnnotationView *recycledAnnotationView = (MKPinAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:annotIdentifier];
if (!recycledAnnotationView) {
MKPinAnnotationView* customPinView = [[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:annotIdentifier] autorelease];
UIImage *iconImage = [UIImage imageNamed:@"arboretum.png"];
CGRect resizeRect;
resizeRect.size = iconImage.size;
CGSize maxSize = CGRectInset(self.view.bounds,
10.0f,
10.0f).size;
maxSize.height -= self.navigationController.navigationBar.frame.size.height + 40.0f;
if (resizeRect.size.width > maxSize.width)
resizeRect.size = CGSizeMake(maxSize.width, resizeRect.size.height / resizeRect.size.width * maxSize.width);
if (resizeRect.size.height > maxSize.height)
resizeRect.size = CGSizeMake(resizeRect.size.width / resizeRect.size.height * maxSize.height, maxSize.height);
customPinView.image = iconImage;
//customPinView.image.frame = CGRectMake(kBorder, kBorder, kWidth - 2 * kBorder, kWidth - 2 * kBorder);
customPinView.opaque = NO;
//customPinView.pinColor = MKPinAnnotationColorPurple;
customPinView.canShowCallout = YES;
//display a disclosure icon on the right side of each annotation's callout
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
customPinView.rightCalloutAccessoryView = rightButton;
return customPinView;
} else {
recycledAnnotationView.annotation = annotation;
}
return recycledAnnotationView;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
提前致谢！
答案 0 :(得分：2)
原来问题在于我如何检索坐标数据。我不经意地将经度与纬度交换，并且点不会在全球地图上的任何点显示。编译器没有发出任何警告或错误，因此没有注意到......所以，对我来说非常尴尬，但这就是你学习的方式，对吧？
答案 1 :(得分：0)
我不知道这是不是问题，但
不是
self = [self init];
假设是
self = [super init];