显示选定半径的 MapView 注释
Posted
技术标签:
【中文标题】显示选定半径的 MapView 注释【英文标题】：Show MapView Annotations for Selected Radius 【发布时间】：2013-05-13 17:12:43 【问题描述】：我有一个地图视图，上面有几个注释。我的导航栏上有一个设置按钮，可将用户带到选择器视图，让他们显示所有注释或选择距当前位置 5、10、25、50 或 100 英里的半径，以便他们只能看到选定半径的注释。我只是不确定如何让地图只显示所选半径的注释。至少有人能指出我正确的方向吗？
这是我的地图：
#import "RSFM.h"
#import "AnnotationDetailView.h"
#import "MapSettings.h"
@interface RSFM ()
@end
@implementation RSFM
@synthesize centerCoordinate, coordinate, title, subtitle, marketAnnotation, location;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
self.title = NSLocalizedString(@"Farm Markets", @"Farm Markets");
// Create location manager object
locationManager = [[CLLocationManager alloc]init];
[locationManager setDelegate:self];
// And we want it to be as accurate as possible regardless of how much time/power it takes
[locationManager setDesiredAccuracy:kCLLocationAccuracyThreeKilometers];
// Tell our manager to start looking for its location immediately
// [locationManager startUpdatingLocation];
return self;
/*
- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
centerCoordinate = CLLocationCoordinate2DMake(37.7885, 85.3279);
*/
- (void)findLocation
[locationManager startUpdatingLocation];
[activityIndicator startAnimating];
// [locationTitleField setHidden:YES];
[locationManager stopUpdatingLocation];
- (void)foundLocation:(CLLocation *)loc
CLLocationCoordinate2D coord = [loc coordinate];
// Zoom the region to this location
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 400000, 400000);
[worldView setRegion:region animated:YES];
// Reset the UI
// [locationTitleField setText:@""];
[activityIndicator stopAnimating];
// [locationTitleField setHidden:NO];
[locationManager stopUpdatingLocation];
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
NSLog(@"%@", newLocation);
// How many seconds ago was this new location created?
NSTimeInterval t = [[newLocation timestamp]timeIntervalSinceNow];
// CLLocationManagers will return the last found location of the device first, you don't want that data in this case.
// If this location was made more than 3 minutes ago, ignore it.
if (t < -180)
// this is cached data, you don't want it, keep looking
return;
[self foundLocation:newLocation];
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
NSLog(@"Could not find location: %@", error);
- (void)dealloc
// Tell the location manager to stop sending us messages
[locationManager setDelegate:nil];
- (MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
// If it's the user location, return nil
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
// Try to dequeue an existing pin view first
static NSString *annotationIdentifier = @"AnnotationIdentifier";
MKPinAnnotationView *pinView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:annotationIdentifier];
pinView.animatesDrop = NO;
pinView.pinColor = MKPinAnnotationColorRed;
pinView.canShowCallout = YES;
UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton setTitle:annotation.title forState:UIControlStateNormal];
pinView.rightCalloutAccessoryView = rightButton;
return pinView;
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
AnnotationDetailView *detail = [[AnnotationDetailView alloc] initWithNibName:nil bundle:nil];
id<MKAnnotation> ann = [mapView.selectedAnnotations objectAtIndex:0];
ann = view.annotation;
CLLocationCoordinate2D annCoord;
annCoord.latitude = ann.coordinate.latitude;
annCoord.longitude = ann.coordinate.longitude;
detail.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
NSLog(@"%@", ann.title);
NSLog(@"%@", ann.subtitle);
detail.annTitle = ann.title;
detail.annSub = ann.subtitle;
detail.latText = [NSString localizedStringWithFormat:@"%f",annCoord.latitude];
detail.longText = [NSString localizedStringWithFormat:@"%f", annCoord.longitude];
[self.navigationController pushViewController:detail animated:YES];
- (IBAction)mapSettingsButtonPressed:(id)sender
MapSettings *mapSettings = [[MapSettings alloc] initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:mapSettings animated:YES];
- (void)viewDidLoad
[locationManager startUpdatingLocation];
[worldView setShowsUserLocation:YES];
[locationManager stopUpdatingLocation];
UIBarButtonItem *settingsButton = [[UIBarButtonItem alloc] initWithTitle:@"\u2699" style:UIBarButtonItemStyleBordered target:self action:@selector(mapSettingsButtonPressed:)];
[settingsButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont boldSystemFontOfSize:24], UITextAttributeFont,nil] forState:UIControlStateNormal];
self.navigationItem.rightBarButtonItem = settingsButton;
NSMutableArray *marketLocations = [[NSMutableArray alloc]init];
NSMutableArray *lat = [[NSMutableArray alloc]initWithObjects:@"37.7867266", @"37.0703517", @"37.1610806", @"37.318367", @"37.3559204", @"37.4154066", @"37.4757622", @"37.7450252", @"37.6318978", @"37.0716803", @"36.7333486", @"36.8637044", @"36.9181305", @"36.8736459", @"36.93253", @"37.0436832", @"37.1516087", @"36.712052", @"36.8082663", @"37.1799935", @"37.8928444", @"37.7488563", @"37.499522", @"37.5882222", @"37.4991846", @"37.5392879", @"37.3721288", @"37.1922315", @"37.102841", @"36.9813651", @"36.660251", @"37.1301316", @"37.1734765", @"37.0505279", @"36.9179492", @"37.2742692", @"37.2116415", @"37.2412938", @"37.2696374", @"37.5464147", @"37.5693561", @"37.7146149", @"37.7647463", @"37.635366", @"37.6417237", @"37.8515069", @"37.6840096", @"37.6000712", @"37.6655401", @"37.6668541", @"37.710869", @"37.7101039", @"37.8721419", @"37.9711379", @"38.0069215", @"38.135998", @"38.105713", @"38.160352", @"38.223825", @"38.188871", @"38.235703", @"38.3586935", @"38.3069755", @"38.6109009", @"38.3600355", @"38.4004693", @"38.5997367", @"38.6414842", @"38.5741722", @"38.1756649", @"38.2686626", @"38.4329612", @"38.673506", @"38.1916673", @"38.2265882", @"38.7363261", @"38.9734399", @"38.977975", @"38.8985392", @"38.903505", @"38.7418795", @"38.5102869", @"38.4260502", @"38.2687025", @"38.2097987", @"38.2074495", @"38.1356551", @"38.1245065", @"38.036634", @"37.9976315", @"37.7785109", @"37.9324058", @"37.9442351", @"37.9631701", @"37.9572905", @"38.0575357", @"37.8184352", @"37.920693", @"37.6256607", @"38.8029428", @"37.911885", @"38.4948355", @"38.5124872", @"38.359333", @"37.5453841", @"36.7641572", @"37.5846472", nil];
NSMutableArray *lon = [[NSMutableArray alloc]initWithObjects:@"-87.608209", @"-88.1237899", @"-87.9148629", @"-87.5074402", @"-87.5448032", @"-87.8003148", @"-87.9515986", @"-87.9061638", @"-87.1148574", @"-87.3008418", @"-87.5661605", @"-87.290597", @"-86.8270899", @"-86.6544847", @"-86.490067", @"-86.4558939", @"-86.2038694", @"-86.3287002", @"-85.9428197", @"-85.8312895", @"-86.2219159", @"-85.8042332", @"-85.8837926", @"-85.6896553", @"-85.6185338", @"-85.3974197", @"-85.3594512", @"-85.5906947", @"-85.3063504", @"-85.060269", @"-85.212777", @"-84.8720139", @"-84.8137247", @"-84.5698918", @"-84.1312625", @"-84.4614493", @"-84.4802606", @"-84.4223536", @"-84.6410206", @"-84.4564877", @"-84.2884479", @"-84.4089207", @"-84.3655048", @"-84.5597937", @"-84.7606165", @"-84.8732843", @"-85.2055835", @"-85.0401771", @"-85.248661", @"-85.1834814", @"-85.261238", @"-85.259706", @"-85.3155742", @"-85.689489", @"-85.8210816", @"-85.503977", @"-85.654787", @"-85.855705", @"-85.592095", @"-85.520966", @"-85.156767", @"-85.1048516", @"-85.1471807", @"-85.1186233", @"-85.5047839", @"-85.3788328", @"-85.3060421", @"-85.3237933", @"-85.2994716", @"-84.8965549", @"-84.6066196", @"-84.8581488", @"-84.8477954", @"-84.541101", @"-84.5685446", @"-84.6280011", @"-84.721179", @"-84.749313", @"-84.6090422", @"-84.441984", @"-84.0662604", @"-83.8971076", @"-83.8566679", @"-84.2433673", @"-84.2529869", @"-84.4785665", @"-84.3652534", @"-84.3541421", @"-84.551631", @"-84.7000274", @"-84.5389521", @"-84.3865064", @"-84.2261198", @"-84.2162117", @"-83.793939", @"-83.9017386", @"-84.0842092", @"-83.2513743", @"-83.5944371", @"-81.2244293", @"-82.748201", @"-82.8310584", @"-82.7304443", @"-83.5611122", @"-84.3922468", @"-86.8666113",@"-87.2933751", nil];
NSMutableArray *title1 = [[NSMutableArray alloc]initWithObjects:@"Cates Farm", @"Broadbent B & B Foods", @"Cayce's Pumpkin Patch", @"Metcalfe Landscaping", @"Brumfield Farm Market", @"Dogwood Valley Farm", @"Country Fresh Meats & Farmers Market", @"Jim David Meats", @"Trunnell's Farm Market", @"Lovell's Orchard & Farm Market", @"Zook's Produce", @"The Country Barn", @"Poore's Nursery & Farms", @"Just Piddlin Farm", @"Chaney's Dairy Barn & Restaurant", @"Jackson's Orchard & Nursery, Inc.", @"Mammoth Cave Transplants", @"Habegger's Amish Market", @"Kenny's Farmhouse Cheese", @"Dennison's Roadside Market", @"Roberts Family Farm", @"Wooden Farm", @"Jordan Greenhouses", @"Lee's Garden Center, Florist & Gift Shop", @"Hinton's Orchard & Farm Market", @"Serenity Farm Alpacas", @"Burton's Nursery & Garden Center", @"Davis Family Farms", @"Heavenly Haven Farm", @"French Valley Farms", @"Cravens Greenhouse", @"Haney's Appledale Farm", @"Hettmansperger's Greenhouse", @"D & F Farms", @"Double Hart Farm", @"Owens Garden Center", @"Hail's Farm", @"Sinking Valley Vineyard & Winery, Inc.", @"Todd's Greenhouse & Florist, LLC", @"McQuerry's Family Farm-Herbs-N-Heirlooms", @"Berea College Farm & Gardens", @"Acres of Land Winery & Restaurant", @"Baldwin Farms", @"Wonder of Life Farm", @"Chateau du Vieux Corbeau Winery/Old Crow Farm Winery", @"Devine's Farm & Corn Maze", @"Flaggy Meadow Fiber Works & Sunshine Alpacas of Kentucky", @"Williams Country Market", @"Serano Alpacas & Yarns", @"1851 Historic Maple Hill Manor B & B, Alpaca & Llama Farm, & Fiber Farm Store", @"Campbell Farm Wool Art Center", @"St. Catharine Farm", @"Capture Your Heart Alpacas", @"Ridgeview Greenhouse & Nursery", @"Country Corner Greenhouse & Nursery, Inc", @"Sunny Acres Farm", @"Morrison's Greenhouses", @"George Gagel Farm Market, LLC", @"Thieneman's Herbs & Perennials", @"Tower View Farm & Nursery", @"Gallrein Farms", @"Sweet Home Spun in the Low Dutch Meetinghouse", @"Mulberry Orchard, LLC", @"Gregory Farms", @"Foxhollow Farm Store", @"Sherwood Acres Beef", @"Bray Orchard & Roadside Market", @"Callis Orchards", @"Bray Fruit", @"Wilson's Nursery", @"Triple J Farm", @"Ayres Family Orchard", @"Michels Family Farm", @"Amerson Farm", @"Bi-Water Farm & Greenhouse", @"Alpine Hills Dairy Tour/Country Pumpkins", @"Blue Ribbon Market", @"Eagle Bend Alpacas Fiber & Gift Shoppe", @"Benton Farms", @"Redman's Farm",@"The Greenhouse in Gertrude", @"Croppers Greenhouse & Nursery", @"McLean's Aerofresh Fruit", @"Julie's Pumpkins", @"Reed Valley Orchard", @"Evans Orchard & Cider Mill", @"Kentucky Green Market", @"Antioch Daylily Garden", @"Golden Apple Fruit Market", @"Boyd Orchards", @"Serenity Hill Fiber & Living History Farm", @"Kelley Farms", @"Beech Springs Farm Market", @"Yuletide Tree Farm & Nursery", @"Townsend's Sorghum Mill and Farm Market", @"Bramble Ridge Orchard", @"C2H2 Farm Market", @"Fannin's Vegetables", @"Country Garden Greenhouse", @"Golden Apple Fruit Market", @"Black Barn Produce, LLC", @"Imel's Greenhouse", @"Feathered Wing Farm Market", @"Hutton-Loyd Tree Farm", @"Halcomb's Knob, LLC", @"Martin Farms", @"Happy Hollow Farms",nil];
NSMutableArray *subtitle1 = [[NSMutableArray alloc]initWithObjects:@"Hwy 425 Henderson, KY 42420", @"257 Mary Blue Road Kuttawa, KY 42055", @"153 Farmersville Road Princeton, KY 42445", @"410 Princeton Road Madisonville, KY 42431", @"3320 Nebo Road Madisonville, KY 42431", @"4551 State Route 109N Clay, KY 42404", @"9355 US Hwy 60 W Sturgis, KY 42459",@"350 T. Frank Wathen Rd. Uniontown, KY 42461", @"9255 Hwy 431 Utica, KY 42376", @"22850 Coal Creek Road Hopkinsville, KY 42240", @"Intersection of KY107 & KY117 Herndon, KY 42240", @"112 Britmart Road Elkton, KY 42220", @"5486 Morgantown Road Russellville, KY 42276", @"10830 S. Morgantown Rd. Woodburn, KY 42170", @"9191 Nashville Road, Bowling Green, KY 42101", @"1280 Slim Island Road Bowling Green, KY 42101", @"5394 Brownsville Road Brownsville, KY 42210", @"945 Perrytown Road Scottsville, KY 42164", @"2033 Thomerson Park Road Austin, KY 42123", @"5824 S. Jackson Hwy. Horse Cave, KY 42749", @"125 Kennedy Road Guston, KY 40142", @"1869 Wooden Lane Elizabethtown, KY 42701", @"13287 Dixie Highway Upton, KY 42784", @"1918 Bardstown Road Hodgenville, KY 42748", @"8631 Campbellsville Road Hodgenville, KY 42748", @"1380 Frogg Lane Raywick, KY 40060", @"2212 Saloma Road Campbellsville, KY 42718", @"313 Hwy 1464 Greensburg, KY 42743", @"230 Heavenly Lane Columbia, KY 42728", @"1842 N. Main St. Jamestown, KY 42629", @"500 Cedar Hill Road Albany, KY 42602", @"8350 West 80 Nancy, KY 42544-8756", @"3917 N. Hwy 837 Science Hill, KY 42553", @"755 Elihu Rush Branch Road Somerset, KY 42501", @"6550 Cumberland Falls Road Corbin, KY 40701", @"735 Latham Road Somerset, KY 42503", @"Hwy 461, at 3 mile marker Somerset, KY 42503", @"1300 Plato-Vanhook Road Somerset, KY 42503", @"35 Skyline Drive Eubank, KY 42567", @"169 Pine Hill Road Paint Lick, KY 40461", @"230 N. Main St. Berea, KY 40404", @"2285 Barnes Mill Road Richmond, KY 40475", @"1113 Tates Creek Road Richmond, KY 40475", @"686 Buckeye Road Lancaster, KY 40444", @"471 Stanford Avenue Danville, KY 40422-1927", @"623 Talmage-Mayo Road Harrodsburg, KY 40330", @"2110 Mackville Road Springfield, KY 40069", @"4189 Craintown Rd. Gravel Switch, KY 40328", @"1805 Booker Road Springfield, KY 40069", @"2941 Perryville Road, US 150 Springfield, KY 40069", @"2888 Bardstown Road Springfield, KY 40069", @"2645 Bardstown Road Springfield, KY 40061", @"9430 Bloomfield Road Bloomfield, KY 40008", @"460 Buffalo Run Road Shepherdsville, KY 40165", @"4877 Hwy 44E Shepherdsville, KY 40165", @"6516 Echo Trail Jeffersontown, KY 40299", @"5613 Cooper Chapel Road Louisville, KY 40229", @"2400 Lower Hunters Trace Louisville, KY 40216", @"9120 Blowing Tree Road Louisville, KY 40220", @"12523 Taylorsville Road Jeffersontown, KY 40299", @"1029 Vigo Road Shelbyville, KY 40065", @"6805 Castle Hwy. Pleasureville, KY 40057", @"1330 Mulberry Pike Shelbyville, KY 40065", @"985 Vance Road Turners Station, KY 40075", @"8905 Hwy 329 Crestwood, KY 40014", @"215 Parker Drive LaGrange, KY 40031", @"2580 Hwy 42 W. Bedford, KY 40006", @"3721 Hwy 421 N Bedford, KY 40006", @"1660 Highway 421 N Bedford, KY 40006", @"3690 East-West Connector (Rte 676) Frankfort, KY 40601", @"2287 Long Lick Road Georgetown, KY 40324", @"525 Wilson Lane Owenton, KY 40359", @"4275 Hwy 1316 Sparta, KY 41086", @"130 McClelland Circle Georgetown, KY 40324", @"877 Cincinnati Road Georgetown, KY 40324", @"2165 Sherman Mount Zion Rd. Dry Ridge, KY 41035", @"8707 Camp Ernst Road Union, KY 41091", @"7812 East Bend Road Burlington, KY 41005", @"11896 Old Lexington Pike Walton, KY 41094", @"12449 Decoursey Pike Morning View, KY 41063", @"3246 Augusta-Berlin Road ***sville, KY 41004", @"5350 Raymond Road May's Lick, KY 41055", @"4085 Ewing Road Ewing, KY 41039", @"1069 Ruddles Mill Road Paris, KY 40361", @"239 Lail Lane Paris, KY 40361", @"180 Stone Road Georgetown, KY 40324", @"5751 Lexington Rd. Lexington, KY 40511", @"2231 Houston Antioch Road Lexington, KY 40516", @"1801 Alexandria Drive Lexington, KY 40504", @"1396 Pinckard Pike Versailles, KY 40383", @"1371 Beverly Lane Nicholasville, KY 40356", @"6483 Old Richmond Road Lexington, KY 40515", @"4776 Old Boonesboro Road Winchester, KY 40391", @"3925 Old Boonesboro Road Winchester, KY 40391", @"11620 Main Street Jeffersonville, KY 40337", @"2726 Osborne Road Mt. Sterling, KY 40353", @"1098 Harris Ferry Road Irvine, KY 40336", @"2140 Hwy 460W West Liberty, KY 41472", @"99 Union Road Beattyville, KY 41311", @"1523 Hwy 119 North Whitesburg, KY 41815", @"52 KY Route 3224 River, KY 41254", @"2836 State Route 1 Greenup, KY 41144", @"45 Katherine Lane Greenup, KY 41144", @"1483 Big Run Road Wallingford, KY 41093", @"430 Wallacetown Road Paint Lick, KY 40461", @"5595 Nashville Road Russellville, KY 42276", @"9730 KY 136W Calhoun, KY 42327", nil];
NSLog(@" Lat Count: %lu", (unsigned long)[lat count]);
NSLog(@" Long Count: %lu", (unsigned long)[lon count]);
NSLog(@" Title Count: %lu", (unsigned long)[title1 count]);
NSLog(@" Subtitle Count: %lu", (unsigned long)[subtitle1 count]);
// CLLocationCoordinate2D location;
// MKPointAnnotation *marketAnnotation;
for (int x = 0; x < [lat count]; x++)
marketAnnotation = [[MKPointAnnotation alloc]init];
location.latitude = [[lat objectAtIndex:x]floatValue];
location.longitude = [[lon objectAtIndex:x]floatValue];
marketAnnotation.coordinate = location;
marketAnnotation.title = [title1 objectAtIndex:x];
marketAnnotation.subtitle = [subtitle1 objectAtIndex:x];
[marketLocations addObject:marketAnnotation];
[worldView addAnnotations:marketLocations];
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
CLLocationCoordinate2D loc = [userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 400000, 400000);
[worldView setRegion:region animated:YES];
[locationManager stopUpdatingLocation];
locationManager.delegate = nil;
- (IBAction)selectSegmentControl
int segmentTouched = [mapVarieties selectedSegmentIndex];
NSString *segmentName = [mapVarieties titleForSegmentAtIndex:segmentTouched];
if ([segmentName isEqualToString:@"Street"])
[worldView setMapType:MKMapTypeStandard];
if ([segmentName isEqualToString:@"Satellite"])
[worldView setMapType:MKMapTypeSatellite];
if ([segmentName isEqualToString:@"Hybrid"])
[worldView setMapType:MKMapTypeHybrid];
@end
这是带有选择器视图的设置视图：
#import "MapSettings.h"
@interface MapSettings ()
@end
@implementation MapSettings
@synthesize radiusPicker, radiusArray;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
// Custom initialization
self.title = @"Map Settings";
return self;
- (void)viewDidLoad
[super viewDidLoad];
radiusArray = [[NSMutableArray alloc]initWithObjects:@"Show All", @"5 Miles", @"10 Miles", @"25 Miles", @"50 Miles", @"100 Miles", nil];
radiusPicker = [[UIPickerView alloc]init];
[radiusPicker setDataSource:self];
[radiusPicker setDelegate:self];
[radiusPicker setFrame:CGRectMake(88, 125, 144, 150)];
radiusPicker.showsSelectionIndicator = YES;
[radiusPicker selectRow:0 inComponent:0 animated:YES];
[self.view addSubview: radiusPicker];
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
return 1;
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
return [radiusArray count];
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
return [radiusArray objectAtIndex: row];
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
NSLog(@"%@", [radiusArray objectAtIndex: row]);
- (void)didReceiveMemoryWarning
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
@end
【问题讨论】：
您确定要这样做吗？在我看来，虽然按距离限制列表中的项目是个好主意，但在地图上限制它们不是。如果用户将地图缩小，您应该显示他们可以看到的地图部分的数据。也许最好使用该选择器来设置地图的初始区域，但添加所有注释，这样如果用户确实移动了地图，他们就可以看到他们想要的项目，而无需返回选择器并重置过滤器。 这听起来确实是个好主意。我将如何让选择器根据他们选择的区域设置地图区域？ 我认为您以模态方式打开设置视图控制器。然后，当它关闭时，您会退回到地图视图控制器并从现在关闭的设置页面中提取值。除此之外，您还需要提出一个新问题。 【参考方案1】：CLLocation 类有一个方法
- (CLLocationDistance)distanceFromLocation:(const CLLocation *)location
您可以使用它来计算当前用户的位置和您的注释之间的距离。如果小于 fx 10 公里，则应将注释添加到地图中，否则应跳过。
【讨论】：
以上是关于显示选定半径的 MapView 注释的主要内容，如果未能解决你的问题，请参考以下文章
从 MySQL 数据库中提取 MapView 注释的坐标，但没有显示注释？