Question

我对编码很陌生，大约有4周的经验，所以对我很轻松。

我基本上想在指定的时间内在地图上显示绿色图钉，如果不是这些时间，则会显示红色图钉。

目前设置两个不同引脚以在指定时间出现的代码正在工作，但是我无法为每个实例实现不同颜色的引脚。

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

MapViewController.h

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

@interface MapViewController : UITableViewController <MKMapViewDelegate, CLLocationManagerDelegate, MKAnnotation> {


    IBOutlet UILabel *currentDate;
    NSString *todaysDate;

    MKMapView *mapView;
}

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

@end

MapViewController.m

#import "MapViewController.h"
#import "SWRevealViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "Annotation.h"


@interface MapViewController ()

@end

@implementation MapViewController {
}

@synthesize mapView;

- (void)viewDidLoad {

    self.mapView.delegate = self;

    NSLocale* locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"];
    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
    [formatter setLocale:locale];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:@"EEEE HH:mm"];
    todaysDate = [formatter stringFromDate:[NSDate date]];
    currentDate.text = todaysDate;

    [super viewDidLoad];

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

//Area
    //Venue
    if (
        //Mon
        [todaysDate  containsString: @"Monday 17"] || [todaysDate  containsString: @"Monday 18"] ||
         //Tues
         [todaysDate  containsString: @"Tuesday 17"] || [todaysDate  containsString: @"Tuesday 18"] ||
         //Weds
         [todaysDate  containsString: @"Wednesday 17"] || [todaysDate  containsString: @"Wednesday 18"] ||
         //Thurs
         [todaysDate  containsString: @"Thursday 17"] || [todaysDate  containsString: @"Thursday 18"] ||
         //Fri
         [todaysDate  containsString: @"Friday 17"] || [todaysDate  containsString: @"Friday 18"] ||
         //Sat
         [todaysDate  containsString: @"Saturday 17"] || [todaysDate  containsString: @"Saturday 18"] ||
         //Sun
         [todaysDate  containsString: @"Sunday 17"] || [todaysDate  containsString: @"Sunday 18"]
         )
    {
        //Green
        myAnn = [[Annotation alloc] init];
        location.latitude = 51.4;
        location.longitude = -0.1;
        myAnn.coordinate = location;
        myAnn.title = @"Venue 1";
        myAnn.subtitle = @"Subtitle 1";
        [locations addObject:myAnn];
        [self.mapView addAnnotations:locations];
        //Green
    } else {
        //Red
        myAnn = [[Annotation alloc] init];
        location.latitude = 51.4;
        location.longitude = -0.1;
        myAnn.coordinate = location;
        myAnn.title = @"Venue 1";
        myAnn.subtitle = @"Subtitle 1";
        [locations addObject:myAnn];
        [self.mapView addAnnotations:locations];
        //Red
}

@end

我明白我必须使用（在MapViewController.m中）：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {

但是后来又迷失了......我已经尝试重命名除myAnn以外的第二个引脚，并根据名称设置MKPinAnnotationColorRed或MKPinAnnotationColorGreen，但无法弄明白。

如果有人能对此有所了解，我将非常感激。

干杯球员

Answer 1

两个注释之间有两个不同，你应该在Annotation类上有一个特殊的属性。标签

      //Green
        myAnn = [[Annotation alloc] init];
myAnn.tag = 0;
        location.latitude = 51.4;
        location.longitude = -0.1;
        myAnn.coordinate = location;
        myAnn.title = @"Venue 1";
        myAnn.subtitle = @"Subtitle 1";
        [locations addObject:myAnn];
        [self.mapView addAnnotations:locations];
        //Green
    } else {
        //Red
        myAnn = [[Annotation alloc] init];
    myAnn.tag = 1;
        location.latitude = 51.4;
        location.longitude = -0.1;
        myAnn.coordinate = location;
        myAnn.title = @"Venue 1";
        myAnn.subtitle = @"Subtitle 1";
        [locations addObject:myAnn];
        [self.mapView addAnnotations:locations];
        //Red

}

然后打开标签

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    //only handle our Annotations
    if(![annotation isKindOfClass:[Annotation class]])
        return;

    MKPinAnnotationView *pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"CustomPinAnnotationView"];
    pinView.animatesDrop = YES;
    pinView.canShowCallout = YES;
    pinView.image = [UIImage imageNamed:@"pizza_slice_32.png"];
    pinView.pinColor = MKPinAnnotationColorPurple;

    if((Annotation.tag == 0)) {
        pinView.pinColor = MKPinAnnotationColorGreen;
    }
    else {
        pinView.pinColor = MKPinAnnotationColorRed;
    }
    return pin;
}

Answer 2

在MKMapView委托“viewForAnnotation”中，你需要使用以下方法创建一个新的Pin，然后相应地改变颜色。

MKPinAnnotationView *pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"CustomPinAnnotationView"];
pinView.animatesDrop = YES;
pinView.canShowCallout = YES;
pinView.image = [UIImage imageNamed:@"pizza_slice_32.png"];
pinView.pinColor = MKPinAnnotationColorPurple;

MKPinAnnotationColor的不同颜色取决于时间

2 个答案: