Obj-C - 所有自定义 MKMapView 注释并不总是显示在 MapView 上？
Obj-C - All Custom MKMapView annotations not always showing on MapView?
我正在尝试使用以下代码（餐厅、公园、聚会和商店）在我的 mapView 上显示多个位置数组。当我打开应用程序时，并非数组内的所有地址都显示在我的 mapView 上（即使返回了所有数据） - 例如有时只有 'Stores' 和 'Parks' 注释数组会显示在我的地图上，但餐厅不可见（即使所有数组的数据都已成功返回）。如果我关闭并重新打开应用程序，有时公园会显示在地图上，但不会显示其他内容。知道为什么会发生这种情况，我该如何解决？代码更新如下。一直在这！
注：ParksAnnotation, RestAnnotation, meetupAnn, & StoreAnnotation 都是MKPointAnnotation 类.
更新 (10/13/2020): 我尝试在检索和地理编码我的 'Stores' 坐标的代码块下记录 'placemarks'。看起来好像 self.storeData 已填充，创建的 NSDictionary storeFields 也是如此。也就是说，当我记录 'placemarks' 时，它不会返回任何坐标，即使 storeFields[@"address"] 已填充。其他代码块似乎工作得很好（即检索 Meet Ups 和检索 Parks）。因此 Meet Ups、Restaurants 和 Parks 注释看起来很好，但所有 Stores 注释都没有填充。当我启动应用程序时，至少一种类型的注释（有时是缺少商店，有时是公园）随机发生这种情况。我一辈子都弄不明白为什么会这样。
见下面代码：
MapViewController.m
#import "StoreAnnotation.h"
#import "ParksAnnotation.h"
#import "RestAnnotation.h"
#import "meetupAnn.h"
@interface MapViewController ()
@end
@implementation MapViewController
-(void)viewWillAppear:(BOOL)animated {
NSMutableDictionary *viewParamsallUsers1 = [NSMutableDictionary new];
[viewParamsallUsers1 setValue:@"hosted_meet_ups" forKey:@"view_name"];
[DIOSView viewGet:viewParamsallUsers1 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.meetUps = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *allMeetups in self.meetUps) {
NSString *location = allMeetups[@"where"];
NSString *userNames = allMeetups[@"node_title"];
NSString *userBio = allMeetups[@"body"];
self.alertMessage = [allMeetups[@"node_title"] mutableCopy];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
meetupAnn *meet = [[meetupAnn alloc] init];
meet.coordinate = placemark.coordinate;
meet.title = userNames;
meet.subtitle = userBio;
meet.index = index; // Store index here.
[self.mapView addAnnotation:meet];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
/// GRAB ALL RESTAURANT LOCATIONS ///
NSMutableDictionary *viewParams6 = [NSMutableDictionary new];
[viewParams6 setValue:@"restaurants" forKey:@"view_name"];
[DIOSView viewGet:viewParams6 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.neighbourhoodData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *multiplelocationsFriend in self.neighbourhoodData) {
NSString *location = multiplelocationsFriend[@"address"];
NSString *userNames = multiplelocationsFriend[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = multiplelocationsFriend[@"body"];
self.x3 = multiplelocationsFriend[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
RestAnnotation *point1 = [[RestAnnotation alloc] init];
point1.coordinate = placemark.coordinate;
point1.title = ampRemoved;
point1.subtitle = userBio;
point1.index = index; // Store index here.
[self.mapView addAnnotation:point1];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
NSString *test = self.areaName;
NSLog(@"SHOW TEST %@", test);
/// GRAB ALL STORE LOCATIONS ///
NSMutableDictionary *viewParams7 = [NSMutableDictionary new];
[viewParams7 setValue:@"stores" forKey:@"view_name"];
[DIOSView viewGet:viewParams7 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.storesData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *storeFields in self.storesData) {
NSString *location = storeFields[@"address"];
NSString *userNames = storeFields[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = storeFields[@"body"];
self.x3 = storeFields[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
StoreAnnotation *point2 = [[StoreAnnotation alloc] init];
point2.coordinate = placemark.coordinate;
point2.title = ampRemoved;
point2.subtitle = userBio;
point2.index = index; // Store index here.
[self.mapView addAnnotation:point2];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
/// GRAB ALL PARKS LOCATIONS ///
NSMutableDictionary *viewParams8 = [NSMutableDictionary new];
[viewParams8 setValue:@"parks" forKey:@"view_name"];
[DIOSView viewGet:viewParams8 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.parksData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *parkFields in self.parksData) {
// NSLog(@"WHAT IS IN FRIENDS %@", self.friendData);
NSString *location = parkFields[@"address"];
NSString *userNames = parkFields[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = parkFields[@"body"];
self.x3 = parkFields[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
ParksAnnotation *point3 = [[ParksAnnotation alloc] init];
point3.coordinate = placemark.coordinate;
point3.title = ampRemoved;
point3.subtitle = userBio;
point3.index = index; // Store index here.
[self.mapView addAnnotation:point3];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{
MKCoordinateRegion mapRegion;
mapRegion.center = mapView.userLocation.coordinate;
mapRegion.span.latitudeDelta = 0.5;
mapRegion.span.longitudeDelta = 0.5;
[mapView setRegion:mapRegion animated: YES];
[self.locationManager stopUpdatingLocation];
self.locationManager = nil;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 8000, 8000);
[mapView setRegion:[mapView regionThatFits:region] animated:YES];
[mapView addAnnotations:[mapView annotations]];
});
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
if([annotation isKindOfClass:[StoreAnnotation class]]) {
static NSString *identifier = @"stores";
MKAnnotationView *storesView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(storesView == nil) {
storesView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
storesView.displayPriority = MKFeatureDisplayPriorityRequired;
storesView.canShowCallout = YES;
storesView.image = [UIImage imageNamed:@"storeann4.png"];
}
else {
storesView.annotation = annotation;
}
return storesView;
}
if([annotation isKindOfClass:[meetupAnn class]]) {
static NSString *identifier = @"meetUps";
MKAnnotationView *pulsingView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(pulsingView == nil) {
pulsingView.displayPriority = MKFeatureDisplayPriorityRequired;
pulsingView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
pulsingView.image = [UIImage imageNamed:@"meetupbeacon.png"];
pulsingView.canShowCallout = YES;
}
else {
pulsingView.annotation = annotation;
}
return pulsingView;
}
if([annotation isKindOfClass:[ParksAnnotation class]]) {
static NSString *identifier = @"parks";
MKAnnotationView *parksView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(parksView == nil) {
parksView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
parksView.displayPriority = MKFeatureDisplayPriorityRequired;
parksView.image = [UIImage imageNamed:@"parksann.png"];
parksView.canShowCallout = YES;
}
else {
parksView.annotation = annotation;
}
return parksView;
}
if([annotation isKindOfClass:[RestAnnotation class]]) {
static NSString *identifier = @"rests";
MKAnnotationView *restView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(restView == nil) {
restView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
restView.displayPriority = MKFeatureDisplayPriorityRequired;
restView.image = [UIImage imageNamed:@"restann.png"];
restView.canShowCallout = YES;
}
else {
restView.annotation = annotation;
}
return restView;
}
您正在将 MKFeatureDisplayPriorityRequired 分配给空对象。尝试在两种情况下分配显示优先级：
当pulsingView不为nil时
pulsingView 分配后。
if([annotation isKindOfClass:[meetupAnn class]]) {
static NSString *identifier = @"currentLocation";
MKAnnotationView *pulsingView = (MKAnnotationView *)[self.friendsMapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(pulsingView == nil) {
pulsingView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
pulsingView.displayPriority = MKFeatureDisplayPriorityRequired;
pulsingView.canShowCallout = YES;
pulsingView.image = [UIImage imageNamed:@"meetupbeacon.png"];
NSLog(@"Location Returned");
} else {
pulsingView.displayPriority = MKFeatureDisplayPriorityRequired;
// TODO: Do map pin initial setup.
}
}
正如 Ramis 所说，问题在于您甚至在实例化 pulsingView 之前就设置了 displayPriority。因此，您随后实例化的 MKAnnotationView 从未得到其 displayPriority 集。
话虽如此，但我建议采用略有不同的实施方式。具体来说，我会将注释视图的配置移动到它自己的子 class 中，而不是用这种代码使视图控制器混乱：
@interface MeetUpAnnotationView: MKAnnotationView
@end
@implementation MeetUpAnnotationView
- (instancetype)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
if (self) {
self.displayPriority = MKFeatureDisplayPriorityRequired;
self.canShowCallout = YES;
self.image = [UIImage imageNamed:@"meetupbeacon.png"];
}
return self;
}
- (void)setAnnotation:(id<MKAnnotation>)annotation {
[super setAnnotation:annotation];
self.displayPriority = MKFeatureDisplayPriorityRequired;
}
@end
然后，如果目标是 iOS 11 或更高版本，您的视图控制器的 viewDidLoad 应该注册该子class。
现在，如果这是您在 iOS 11 中显示的唯一注释视图，则您根本不需要 viewForAnnotation，只需注册您的默认注释视图即可：
[self.mapView registerClass:[MeetUpAnnotationView class] forAnnotationViewWithReuseIdentifier:MKMapViewDefaultAnnotationViewReuseIdentifier];
并且注册了注释视图 class，您就完成了。不需要或不需要 viewForAnnotation。
您唯一需要在 iOS 11 及更高版本中实施 viewForAnnotation 的情况是您的地图上有多个自定义注释视图类型。在这种情况下，您需要注册它们：
[self.mapView registerClass:[MeetUpAnnotationView class] forAnnotationViewWithReuseIdentifier:meetupIdentifier];
[self.mapView registerClass:[SomeOtherAnnotationView class] forAnnotationViewWithReuseIdentifier:someOtherIdentifier];
然后在 viewForAnnotation:
中使用 dequeueReusableAnnotationViewWithIdentifier:forAnnotation:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MeetupAnn class]]) {
return [mapView dequeueReusableAnnotationViewWithIdentifier:meetupIdentifier forAnnotation:annotation];
}
if ([annotation isKindOfClass:[SomeOtherAnnotation class]]) {
return [mapView dequeueReusableAnnotationViewWithIdentifier:someOtherIdentifier forAnnotation:annotation];
}
...
return nil;
}
如您所见，在iOS11中（尤其是当您只有一种注释视图类型时），代码大大简化了。
但是如果你需要支持旧的iOS版本，你不能注册标识符，你必须使用旧的dequeueReusableAnnotationViewWithIdentifier:，但我还是让注解视图子class 自行配置。但是，代码中的一个更微妙的问题是您没有在 else 子句中设置 annotation，因此请确保这样做，例如：
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MeetupAnn class]]) {
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:meetupIdentifier];
if (!annotationView) {
annotationView = [[MeetUpAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:meetupIdentifier];
} else {
annotationView.annotation = annotation;
}
return annotationView;
}
return nil;
}
您应该检查您的某些地理编码请求是否不一致地失败。
CLGeocoder 速率限制您的请求，如果您在短时间内请求太多，您将收到错误消息。 https://developer.apple.com/documentation/corelocation/clgeocoder/1423509-geocodeaddressstring?language=objc
检查在 completionHandler 块内 NSError* error 内是否有任何失败原因。
失败的次数越多，您在 MapView 上看到的注释就越少，因为它没有输入以下代码路径。
if (placemarks && placemarks.count > 0) {
// Not entering here
}
if (nil != error) {
// Could land here
}
唯一的其他原因是没有正确计算地图区域以在屏幕上显示所有注释。确保在将每个注释添加到 mapView 时 calculating/adjusting 区域正确。
// Define these variables globally in the view controller
CLLocationDegrees minLatitude = 90.0;
CLLocationDegrees maxLatitude = -90.0;
CLLocationDegrees minLongitude = 180.0;
CLLocationDegrees maxLongitude = -180.0;
// Call following method every time a new annotation needs to be added to the mapView
-(void)addAnnotation:(id<MKAnnotation>)annotation toMapView:(MKMapView*)mapView {
// Add the annotation to map
[mapView addAnnotation:annotation];
// Set the map region to make it visible along with all other annotations
CLLocationDegrees latitude = annotation.coordinate.latitude;
CLLocationDegrees longitude = annotation.coordinate.longitude;
minLatitude = min(minLatitude, latitude);
maxLatitude = max(maxLatitude, latitude);
minLongitude = min(minLongitude, longitude);
maxLongitude = max(maxLongitude, longitude);
CLLocationDegrees latitudeDelta = (maxLatitude - minLatitude);
CLLocationDegrees longitudeDelta = (maxLongitude - minLongitude);
CLLocationDegrees midLatitude = (maxLatitude - latitudeDelta/2);
CLLocationDegrees midLongitude = (maxLongitude - longitudeDelta/2);
CLLocationCoordinate2D center = CLLocationCoordinate2DMake(midLatitude, midLongitude);
MKCoordinateSpan span = MKCoordinateSpanMake(latitudeDelta, longitudeDelta);
MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
if (CLLocationCoordinate2DIsValid(center)) {
[mapView setRegion:region animated:YES];
}
}
我正在尝试使用以下代码（餐厅、公园、聚会和商店）在我的 mapView 上显示多个位置数组。当我打开应用程序时，并非数组内的所有地址都显示在我的 mapView 上（即使返回了所有数据） - 例如有时只有 'Stores' 和 'Parks' 注释数组会显示在我的地图上，但餐厅不可见（即使所有数组的数据都已成功返回）。如果我关闭并重新打开应用程序，有时公园会显示在地图上，但不会显示其他内容。知道为什么会发生这种情况，我该如何解决？代码更新如下。一直在这！
注：ParksAnnotation, RestAnnotation, meetupAnn, & StoreAnnotation 都是MKPointAnnotation 类.
更新 (10/13/2020): 我尝试在检索和地理编码我的 'Stores' 坐标的代码块下记录 'placemarks'。看起来好像 self.storeData 已填充，创建的 NSDictionary storeFields 也是如此。也就是说，当我记录 'placemarks' 时，它不会返回任何坐标，即使 storeFields[@"address"] 已填充。其他代码块似乎工作得很好（即检索 Meet Ups 和检索 Parks）。因此 Meet Ups、Restaurants 和 Parks 注释看起来很好，但所有 Stores 注释都没有填充。当我启动应用程序时，至少一种类型的注释（有时是缺少商店，有时是公园）随机发生这种情况。我一辈子都弄不明白为什么会这样。
见下面代码：
MapViewController.m
#import "StoreAnnotation.h"
#import "ParksAnnotation.h"
#import "RestAnnotation.h"
#import "meetupAnn.h"
@interface MapViewController ()
@end
@implementation MapViewController
-(void)viewWillAppear:(BOOL)animated {
NSMutableDictionary *viewParamsallUsers1 = [NSMutableDictionary new];
[viewParamsallUsers1 setValue:@"hosted_meet_ups" forKey:@"view_name"];
[DIOSView viewGet:viewParamsallUsers1 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.meetUps = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *allMeetups in self.meetUps) {
NSString *location = allMeetups[@"where"];
NSString *userNames = allMeetups[@"node_title"];
NSString *userBio = allMeetups[@"body"];
self.alertMessage = [allMeetups[@"node_title"] mutableCopy];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
meetupAnn *meet = [[meetupAnn alloc] init];
meet.coordinate = placemark.coordinate;
meet.title = userNames;
meet.subtitle = userBio;
meet.index = index; // Store index here.
[self.mapView addAnnotation:meet];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
/// GRAB ALL RESTAURANT LOCATIONS ///
NSMutableDictionary *viewParams6 = [NSMutableDictionary new];
[viewParams6 setValue:@"restaurants" forKey:@"view_name"];
[DIOSView viewGet:viewParams6 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.neighbourhoodData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *multiplelocationsFriend in self.neighbourhoodData) {
NSString *location = multiplelocationsFriend[@"address"];
NSString *userNames = multiplelocationsFriend[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = multiplelocationsFriend[@"body"];
self.x3 = multiplelocationsFriend[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
RestAnnotation *point1 = [[RestAnnotation alloc] init];
point1.coordinate = placemark.coordinate;
point1.title = ampRemoved;
point1.subtitle = userBio;
point1.index = index; // Store index here.
[self.mapView addAnnotation:point1];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
NSString *test = self.areaName;
NSLog(@"SHOW TEST %@", test);
/// GRAB ALL STORE LOCATIONS ///
NSMutableDictionary *viewParams7 = [NSMutableDictionary new];
[viewParams7 setValue:@"stores" forKey:@"view_name"];
[DIOSView viewGet:viewParams7 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.storesData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *storeFields in self.storesData) {
NSString *location = storeFields[@"address"];
NSString *userNames = storeFields[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = storeFields[@"body"];
self.x3 = storeFields[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
StoreAnnotation *point2 = [[StoreAnnotation alloc] init];
point2.coordinate = placemark.coordinate;
point2.title = ampRemoved;
point2.subtitle = userBio;
point2.index = index; // Store index here.
[self.mapView addAnnotation:point2];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
/// GRAB ALL PARKS LOCATIONS ///
NSMutableDictionary *viewParams8 = [NSMutableDictionary new];
[viewParams8 setValue:@"parks" forKey:@"view_name"];
[DIOSView viewGet:viewParams8 success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.parksData = [responseObject mutableCopy];
int index = 0;
for (NSMutableDictionary *parkFields in self.parksData) {
// NSLog(@"WHAT IS IN FRIENDS %@", self.friendData);
NSString *location = parkFields[@"address"];
NSString *userNames = parkFields[@"node_title"];
NSString *ampRemoved = [userNames stringByReplacingOccurrencesOfString:@"amp;" withString:@""];
NSString *userBio = parkFields[@"body"];
self.x3 = parkFields[@"x3"];
CLGeocoder *geocoderFriend = [[CLGeocoder alloc] init];
[geocoderFriend geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 150.0;
region.span.latitudeDelta /= 150.0;
ParksAnnotation *point3 = [[ParksAnnotation alloc] init];
point3.coordinate = placemark.coordinate;
point3.title = ampRemoved;
point3.subtitle = userBio;
point3.index = index; // Store index here.
[self.mapView addAnnotation:point3];
}
}
];
index = index + 1;
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Failure: %@", [error localizedDescription]);
}];
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{
MKCoordinateRegion mapRegion;
mapRegion.center = mapView.userLocation.coordinate;
mapRegion.span.latitudeDelta = 0.5;
mapRegion.span.longitudeDelta = 0.5;
[mapView setRegion:mapRegion animated: YES];
[self.locationManager stopUpdatingLocation];
self.locationManager = nil;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 8000, 8000);
[mapView setRegion:[mapView regionThatFits:region] animated:YES];
[mapView addAnnotations:[mapView annotations]];
});
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
if([annotation isKindOfClass:[StoreAnnotation class]]) {
static NSString *identifier = @"stores";
MKAnnotationView *storesView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(storesView == nil) {
storesView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
storesView.displayPriority = MKFeatureDisplayPriorityRequired;
storesView.canShowCallout = YES;
storesView.image = [UIImage imageNamed:@"storeann4.png"];
}
else {
storesView.annotation = annotation;
}
return storesView;
}
if([annotation isKindOfClass:[meetupAnn class]]) {
static NSString *identifier = @"meetUps";
MKAnnotationView *pulsingView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(pulsingView == nil) {
pulsingView.displayPriority = MKFeatureDisplayPriorityRequired;
pulsingView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
pulsingView.image = [UIImage imageNamed:@"meetupbeacon.png"];
pulsingView.canShowCallout = YES;
}
else {
pulsingView.annotation = annotation;
}
return pulsingView;
}
if([annotation isKindOfClass:[ParksAnnotation class]]) {
static NSString *identifier = @"parks";
MKAnnotationView *parksView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(parksView == nil) {
parksView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
parksView.displayPriority = MKFeatureDisplayPriorityRequired;
parksView.image = [UIImage imageNamed:@"parksann.png"];
parksView.canShowCallout = YES;
}
else {
parksView.annotation = annotation;
}
return parksView;
}
if([annotation isKindOfClass:[RestAnnotation class]]) {
static NSString *identifier = @"rests";
MKAnnotationView *restView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(restView == nil) {
restView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
restView.displayPriority = MKFeatureDisplayPriorityRequired;
restView.image = [UIImage imageNamed:@"restann.png"];
restView.canShowCallout = YES;
}
else {
restView.annotation = annotation;
}
return restView;
}
您正在将 MKFeatureDisplayPriorityRequired 分配给空对象。尝试在两种情况下分配显示优先级：
当pulsingView不为nil时
pulsingView 分配后。
if([annotation isKindOfClass:[meetupAnn class]]) { static NSString *identifier = @"currentLocation"; MKAnnotationView *pulsingView = (MKAnnotationView *)[self.friendsMapView dequeueReusableAnnotationViewWithIdentifier:identifier]; if(pulsingView == nil) { pulsingView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier]; pulsingView.displayPriority = MKFeatureDisplayPriorityRequired; pulsingView.canShowCallout = YES; pulsingView.image = [UIImage imageNamed:@"meetupbeacon.png"]; NSLog(@"Location Returned"); } else { pulsingView.displayPriority = MKFeatureDisplayPriorityRequired; // TODO: Do map pin initial setup. } }
正如 Ramis 所说，问题在于您甚至在实例化 pulsingView 之前就设置了 displayPriority。因此，您随后实例化的 MKAnnotationView 从未得到其 displayPriority 集。
话虽如此，但我建议采用略有不同的实施方式。具体来说，我会将注释视图的配置移动到它自己的子 class 中，而不是用这种代码使视图控制器混乱：
@interface MeetUpAnnotationView: MKAnnotationView
@end
@implementation MeetUpAnnotationView
- (instancetype)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
if (self) {
self.displayPriority = MKFeatureDisplayPriorityRequired;
self.canShowCallout = YES;
self.image = [UIImage imageNamed:@"meetupbeacon.png"];
}
return self;
}
- (void)setAnnotation:(id<MKAnnotation>)annotation {
[super setAnnotation:annotation];
self.displayPriority = MKFeatureDisplayPriorityRequired;
}
@end
然后，如果目标是 iOS 11 或更高版本，您的视图控制器的 viewDidLoad 应该注册该子class。
现在，如果这是您在 iOS 11 中显示的唯一注释视图，则您根本不需要 viewForAnnotation，只需注册您的默认注释视图即可：
[self.mapView registerClass:[MeetUpAnnotationView class] forAnnotationViewWithReuseIdentifier:MKMapViewDefaultAnnotationViewReuseIdentifier];
并且注册了注释视图 class，您就完成了。不需要或不需要 viewForAnnotation。
您唯一需要在 iOS 11 及更高版本中实施 viewForAnnotation 的情况是您的地图上有多个自定义注释视图类型。在这种情况下，您需要注册它们：
[self.mapView registerClass:[MeetUpAnnotationView class] forAnnotationViewWithReuseIdentifier:meetupIdentifier];
[self.mapView registerClass:[SomeOtherAnnotationView class] forAnnotationViewWithReuseIdentifier:someOtherIdentifier];
然后在 viewForAnnotation:
dequeueReusableAnnotationViewWithIdentifier:forAnnotation:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MeetupAnn class]]) {
return [mapView dequeueReusableAnnotationViewWithIdentifier:meetupIdentifier forAnnotation:annotation];
}
if ([annotation isKindOfClass:[SomeOtherAnnotation class]]) {
return [mapView dequeueReusableAnnotationViewWithIdentifier:someOtherIdentifier forAnnotation:annotation];
}
...
return nil;
}
如您所见，在iOS11中（尤其是当您只有一种注释视图类型时），代码大大简化了。
但是如果你需要支持旧的iOS版本，你不能注册标识符，你必须使用旧的dequeueReusableAnnotationViewWithIdentifier:，但我还是让注解视图子class 自行配置。但是，代码中的一个更微妙的问题是您没有在 else 子句中设置 annotation，因此请确保这样做，例如：
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MeetupAnn class]]) {
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:meetupIdentifier];
if (!annotationView) {
annotationView = [[MeetUpAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:meetupIdentifier];
} else {
annotationView.annotation = annotation;
}
return annotationView;
}
return nil;
}
您应该检查您的某些地理编码请求是否不一致地失败。
CLGeocoder 速率限制您的请求，如果您在短时间内请求太多，您将收到错误消息。 https://developer.apple.com/documentation/corelocation/clgeocoder/1423509-geocodeaddressstring?language=objc
检查在 completionHandler 块内 NSError* error 内是否有任何失败原因。
失败的次数越多，您在 MapView 上看到的注释就越少，因为它没有输入以下代码路径。
if (placemarks && placemarks.count > 0) {
// Not entering here
}
if (nil != error) {
// Could land here
}
唯一的其他原因是没有正确计算地图区域以在屏幕上显示所有注释。确保在将每个注释添加到 mapView 时 calculating/adjusting 区域正确。
// Define these variables globally in the view controller
CLLocationDegrees minLatitude = 90.0;
CLLocationDegrees maxLatitude = -90.0;
CLLocationDegrees minLongitude = 180.0;
CLLocationDegrees maxLongitude = -180.0;
// Call following method every time a new annotation needs to be added to the mapView
-(void)addAnnotation:(id<MKAnnotation>)annotation toMapView:(MKMapView*)mapView {
// Add the annotation to map
[mapView addAnnotation:annotation];
// Set the map region to make it visible along with all other annotations
CLLocationDegrees latitude = annotation.coordinate.latitude;
CLLocationDegrees longitude = annotation.coordinate.longitude;
minLatitude = min(minLatitude, latitude);
maxLatitude = max(maxLatitude, latitude);
minLongitude = min(minLongitude, longitude);
maxLongitude = max(maxLongitude, longitude);
CLLocationDegrees latitudeDelta = (maxLatitude - minLatitude);
CLLocationDegrees longitudeDelta = (maxLongitude - minLongitude);
CLLocationDegrees midLatitude = (maxLatitude - latitudeDelta/2);
CLLocationDegrees midLongitude = (maxLongitude - longitudeDelta/2);
CLLocationCoordinate2D center = CLLocationCoordinate2DMake(midLatitude, midLongitude);
MKCoordinateSpan span = MKCoordinateSpanMake(latitudeDelta, longitudeDelta);
MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
if (CLLocationCoordinate2DIsValid(center)) {
[mapView setRegion:region animated:YES];
}
}