我正在研究一个在地图上显示画廊列表的iPhone应用程序。画廊列表来自从网上下载的plist。位置坐标正确加载到地图中，以及每个位置的标题和副标题。
我还可以从plist中加载注释视图图像的图像。
我遇到的问题是注释视图图像和详细视图页面都加载了plist数组中最后一个位置的信息，而不是加载与正确位置信息相对应的信息。
我认为问题与这个整数有关： for（int i = 0; i＆lt; [galleries count]; i ++）
但老实说我不确定。
非常感谢任何帮助！
以下是代码：
MapAnnotation.h
#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>
@interface MapAnnotation : NSObject <MKAnnotation>{
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subTitle;
}
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
@end
MapAnnotation.m
#import "MapAnnotation.h"
@implementation MapAnnotation
@synthesize coordinate, title, subtitle;
@end
MapViewViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface MapViewViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>{
NSMutableArray *galleries;
MKMapView *_MapView;
MKAnnotationView *Ann;
}
@property (nonatomic, retain) IBOutlet MKMapView *_MapView;
@property (nonatomic, retain) IBOutlet MKAnnotationView *Ann;
@property (nonatomic, retain) NSArray *addressArray;
@property (nonatomic, retain) NSMutableArray *galleries;
@property (nonatomic, retain) NSString *imageUrl;
@property (nonatomic, retain) NSData *imagedata;
-(IBAction)getlocation;
- (void)loadAnnotations;
@end
MapViewViewController.m
#import "MapViewViewController.h"
#import "MapAnnotation.h"
#import "MoredetailViewController.h"
@implementation MapViewViewController
@synthesize _MapView, Ann;
@synthesize galleries, addressArray;
@synthesize imagedata, imageUrl;
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[galleries removeAllObjects];
addressArray=[[NSMutableArray alloc]initWithContentsOfURL:[NSURL URLWithString:@"http://www.jimirobinson.com/plist/MapInformation.plist"]];
galleries = [[NSMutableArray alloc] initWithArray:addressArray];
[self loadAnnotations];
}
- (void)viewDidLoad
{
[super viewDidLoad];
MKCoordinateRegion region;
region.center.latitude = 39.952133;
region.center.longitude = -75.144264;
region.span.longitudeDelta = 0.005;
region.span.latitudeDelta = 0.001;
[_MapView setRegion:region animated:YES];
}
-(IBAction)getlocation {
_MapView.showsUserLocation = YES;
}
- (void)loadAnnotations {
CLLocationCoordinate2D pinCoordinates;
for (int i = 0; i < [galleries count]; i++)
{
MapAnnotation *myAnnotations = [[MapAnnotation alloc] init];
pinCoordinates.latitude = [[[galleries objectAtIndex:i] objectForKey:@"latitude"] floatValue];
pinCoordinates.longitude = [[[galleries objectAtIndex:i] objectForKey:@"longitude"] floatValue];
[myAnnotations setTitle:[[galleries objectAtIndex:i] objectForKey:@"annotation_title"]];
[myAnnotations setSubtitle:[[galleries objectAtIndex:i] objectForKey:@"annotation_subtitle"]];
imageUrl = [[galleries objectAtIndex:i] objectForKey:@"map_pin_image_url"];
imagedata = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
[myAnnotations setCoordinate:pinCoordinates];
[_MapView addAnnotation:myAnnotations];
}
}
- (MKAnnotationView *)mapView :(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"AddrAnnot"];
annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"AddrAnnot"];
if (_MapView.userLocation == annotation)
{
return nil;
}
annotationView.image = [UIImage imageWithData:imagedata];
annotationView.canShowCallout = YES;
[annotationView setBackgroundColor:[UIColor clearColor]];
[annotationView setFrame:CGRectMake(0, 0, 30, 30)];
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
annotationView.leftCalloutAccessoryView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flag1.png"]];
[_MapView addAnnotation:annotation];
return annotationView;
NSLog(@"%s: annotationView=%@", __func__, annotationView);
}
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
MoredetailViewController *moredetail = [self.storyboard instantiateViewControllerWithIdentifier:@"TextPage"];
[self.navigationController pushViewController:moredetail animated:YES];
for(int i=0; i < [galleries count]; i++)
{
moredetail.MoredetailTitle.text = [[galleries objectAtIndex:i] objectForKey:@"annotation_title"];
moredetail.MoredetailDescription.text = [[galleries objectAtIndex:i] objectForKey:@"annotation_subtitle"];
NSLog(@"%d", i);
NSString *image = [[galleries objectAtIndex:i] objectForKey:@"map_pin_image_url"];
NSData *dataz = [NSData dataWithContentsOfURL:[NSURL URLWithString:image]];
moredetail.detailImage.image = [UIImage imageWithData:dataz];
}
NSLog(@"I've been tapped");
}
- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views {
NSLog(@"%s: galleries=%@", __func__, galleries);
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
@end
MapInformation.plist
<?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">
<array>
<dict>
<key>title</key>
<string>Gallery One</string>
<key>annotation_title</key>
<string>Gallery One Title</string>
<key>annotation_subtitle</key>
<string>Gallery One Subtitle</string>
<key>map_pin_image_url</key>
<string>http://www.jimirobinson.com/plist/flag1.png</string>
<key>latitude</key>
<real>39.952827</real>
<key>longitude</key>
<real>-75.145203</real>
</dict>
<dict>
<key>title</key>
<string>Gallery Two</string>
<key>annotation_title</key>
<string>Gallery Two Title</string>
<key>annotation_subtitle</key>
<string>Gallery Two Subtitle</string>
<key>map_pin_image_url</key>
<string>http://www.jimirobinson.com/plist/flag2.png</string>
<key>latitude</key>
<real>39.952184</real>
<key>longitude</key>
<real>-75.145368</real>
</dict>
<dict>
<key>title</key>
<string>Gallery Three</string>
<key>annotation_title</key>
<string>Gallery Three Title</string>
<key>annotation_subtitle</key>
<string>Gallery Three Subtitle</string>
<key>map_pin_image_url</key>
<string>http://www.jimirobinson.com/plist/flag3.png</string>
<key>latitude</key>
<real>39.951135</real>
<key>longitude</key>
<real>-75.143368</real>
</dict>
</array>
</plist>
答案 0 :(得分：1)
我不敢说，但这段代码需要大量工作才能按预期工作。
首先，imagedata是一个实例变量，您将其设置为最后一个注释的图像数据（在loadAnnotations中）。 viewForAnnotation然后使用imagedata作为图片，因此它将始终设置为最后一个注释的图像。
其次，在calloutAccessoryControlTapped中，您正在迭代所有图库，并在moredetail视图控制器上设置属性，以便视图控制器始终显示最后一个图库的详细信息。
我建议您为MapAnnotation类添加更多属性，例如imageUrl。然后，您可以在创建注释时设置此属性。在viewForAnnotation中，您可以执行此操作：
if ([annotation isKindOfClass:[MapAnnotation class]])
{
MapAnnotation *mapAnnotation = (MapAnnotation *)annotation;
annotationView.image = [NSData dataWithContentsOfURL:[NSURL URLWithString:[mapAnnotation imageURL]];
在calloutAccessoryControlTapped方法中，您可以执行此操作：
MapAnnotation *mapAnnotationPressed = (MapAnnotation *)view.annotation;
moredetail.MoredetailTitle.text = [mapAnnotationPressed title];
我希望这可以让您了解如何使代码正常工作。