放大iOS7后，标注打开错误视图

时间：2014-07-11 16:18:11

标签： ios mapkit mkannotation ios7.1

除了一件事，我的应用程序中的一切工作正常：放大并缩小后，要查看整个地图，一些标注会打开错误的详细视图。 我不知道我是否遗漏了一些代码。 使用Xcode 5.1.1 for iOS7。 这就是我现在所拥有的：

Annotation.h 

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface Annotation: NSObject <MKAnnotation>

@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;

@end

Annotation.m 

#import "Annotation.h"

@implementation Annotation
@synthesize coordinate,title,subtitle;

@end

MapView.h 

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface Nameofthemap : UIViewController <MKMapViewDelegate>

@property (strong, nonatomic) IBOutlet MKMapView *Nameofthemap;

@end

MapView.m 

#import "MapView.h"
#import "Annotation.h"
#import "InfoViewController.h"
#import "InfoTwoViewController.h"

@interface MapView ()
@property (nonatomic, strong) IBOutlet InfoViewController *InfoViewController;

@property (nonatomic, strong) IBOutlet InfoTwoViewController *InfoTwoViewController;

@end

#define PLACE1_LATITUDE 43.777130;
#define PLACE2_LONGITUDE 10.790018;

#define PLACE2_LATITUDE 43.81471237;

#define PLACE2_LONGITUDE 10.67472765;

@implementation MapView

- (IBAction)changeMapType:(id)sender {
    if (_MapView.mapType == MKMapTypeHybrid)
    _MapView.mapType = MKMapTypeStandard;
else
    _MapView.mapType = MKMapTypeHybrid;
}

- (void)viewDidLoad
{
[super viewDidLoad];

[self gotoLocation];

_MapView.showsUserLocation = YES;


}
- (void)gotoLocation
{
MKCoordinateRegion newRegion;

newRegion.center.latitude = PLACE1_LATITUDE;
newRegion.center.longitude = PLACE2_LONGITUDE;

newRegion.span.latitudeDelta = 0.25f;
newRegion.span.longitudeDelta = 0.25f;

[self.MapView setRegion:newRegion animated:YES];

NSMutableArray * locations = [[NSMutableArray alloc] init];
CLLocationCoordinate2D location;
Annotation *myAnn;

Annotation *myAnn2;

//Place1 annotation
myAnn = [[Annotation alloc] init];
location.latitude = PLACE1_LATITUDE;
location.longitude = PLACE1_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Name of the place";
myAnn.subtitle = @"Details";
[locations addObject:myAnn];

//Place2 annotation
myAnn2 = [[Annotation alloc] init];
location.latitude = PLACE2_LATITUDE;
location.longitude = PLACE2_LONGITUDE;
myAnn2.coordinate = location;
myAnn2.title = @"Name of place two";
myAnn2.subtitle = @"Details";

[locations addObject:myAnn2];

[self->_MapView addAnnotations:locations];

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view     calloutAccessoryControlTapped:(UIControl *)control{

}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)myAnn {
if ([myAnn isKindOfClass:[MKUserLocation class]])
{
    ((MKUserLocation *)myAnn).title = @"Your position";
    return nil;
}
MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView  dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
if (!pinView) {
    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:myAnn reuseIdentifier:@"pinView"];
    pinView.pinColor = MKPinAnnotationColorRed;
    pinView.canShowCallout = YES;

    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    if ([[myAnn title] isEqualToString:@"Name of the place"]){
        [rightButton addTarget:self  action:@selector(myAnnClicked:)forControlEvents:UIControlEventTouchUpInside];
    }
    if ([[myAnn title] isEqualToString:@"Name of place two"]){
        [rightButton addTarget:self action:@selector(myAnn2Clicked:)forControlEvents:UIControlEventTouchUpInside];

    }
pinView.rightCalloutAccessoryView = rightButton;
}
    return pinView;
}

-(IBAction)myAnnClicked:(id)sender
{
InfoViewController *info = [[InfoViewController alloc]init];
[self.navigationController pushViewController:info animated:YES];
}
-(IBAction)myAnn2Clicked:(id)sender
{
InfoTwoController *info2 = [[InfoTwoController alloc]init];
[self.navigationController pushViewController:info2 animated:YES];

}
@end

1 个答案:

答案 0 :(得分：0)

这是一个注释视图重用问题。

在viewForAnnotation中，仅在创建视图时设置按钮目标（如果dequeueReusableAnnotationViewWithIdentifier返回nil）。

但是如果dequeueReusableAnnotationViewWithIdentifier返回先前使用过的视图，那么按钮目标仍然是为之前使用该视图的注释设置的内容。

之前的注释可能与当前注释不同。

因此，注释“two”可以重复使用最初为注释“one”创建的视图，并且点击已经创建的按钮会显示“one”而不是“two”的信息。

要解决这个问题，应该做两件事：

  1. 如果dequeueReusableAnnotationViewWithIdentifier返回视图（如果pinView不是nil），则代码必须将视图的annotation属性更新为当前注释
  2. 必须设置按钮目标，无论是创建新视图还是重新使用出列视图。最简单的方法是在主if之后和return之前移动按钮创建/设置。

    3. 更新的viewForAnnotation将如下所示：

    - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)myAnn {
    if ([myAnn isKindOfClass:[MKUserLocation class]])
    {
        ((MKUserLocation *)myAnn).title = @"Your position";
        return nil;
    }

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView  dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:myAnn reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.canShowCallout = YES;
    }
    else
    {
        //1. Re-using a view, update which annotation it's being used for now
        pinView.annotation = myAnn;
    }

    //2. Now pinView is either a new view or re-used view.
    //Set its button target based on current annotation...

    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    if ([[myAnn title] isEqualToString:@"Name of the place"]){
        [rightButton addTarget:self  action:@selector(myAnnClicked:)forControlEvents:UIControlEventTouchUpInside];
    }
    if ([[myAnn title] isEqualToString:@"Name of place two"]){
        [rightButton addTarget:self action:@selector(myAnn2Clicked:)forControlEvents:UIControlEventTouchUpInside];

    }
    pinView.rightCalloutAccessoryView = rightButton;

    return pinView;
}


    顺便说一下，不是为每个注释创建单独的方法（这可能会变得单调乏味），而是使用地图视图的calloutAccessoryControlTapped委托方法。

    事实上，现在，地图视图正在调用您的自定义方法和calloutAccessoryControlTapped委托方法（当前没有代码）。

    在委托方法中，可以通过view.annotation访问已点按的注释。

    所以在viewForAnnotation中，您只需执行此操作：

    - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)myAnn {
    if ([myAnn isKindOfClass:[MKUserLocation class]])
    {
        ((MKUserLocation *)myAnn).title = @"Your position";
        return nil;
    }

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView  dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:myAnn reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.canShowCallout = YES;
        pinView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    }
    else
    {
        pinView.annotation = myAnn;
    }

    return pinView;
}

    然后在calloutAccessoryControlTapped委托方法中，您可以执行以下操作：

    - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control{

    if ([view.annotation isKindOfClass:[Annotation class]])
    {
        Annotation *myAnn = (Annotation *)view.annotation;

        id vcToPush = nil;

        if ([[myAnn title] isEqualToString:@"Name of the place"]) {
            vcToPush = [[InfoViewController alloc]init];
        }
        else if ([[myAnn title] isEqualToString:@"Name of place two"]) {
            vcToPush = [[InfoTwoController alloc]init];
        }

        [self.navigationController pushViewController:vcToPush animated:YES];
    }
}

    然后删除myAnnClicked和myAnn2Clicked方法。

    为每个注释创建一个通用的“Info”视图控制器而不是单独的视图控制器也会好得多。

    其他一些不相关的事情：

    • 请勿在{{1​​}}行
      • 的末尾添加分号
    • 您已定义#define两次
    • PLACE2_LONGITUDE正在使用newRegion.center而不是PLACE2_LONGITUDE
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