Question

我有一个带有textField的mapkit，用户可以在其中添加自己的点;程序运行，但当我输入内容并按回车键时，没有任何反应，没有设置新的引脚。谁能告诉我我做错了什么？ Pin类的代码

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

@interface Pin : NSObject <MKAnnotation>

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSDate *createdAt;
@property (nonatomic) CLLocationCoordinate2D coordinate;

- (instancetype)initWithName:(NSString*)name andCoord:(CLLocationCoordinate2D)coord;



+ (instancetype)spotWithName:(NSString*)name andCoord:(CLLocationCoordinate2D)coord;

- (NSString*)title;

@end

Pin.m：

#import "Pin.h"

@implementation Pin

- (instancetype)initWithName:(NSString *)name andCoord:(CLLocationCoordinate2D)coord {
    if (self = [super init]) {
        _name = name;
        _coordinate = coord;
        _createdAt = [NSDate date];
    }
    return self;
}

+ (instancetype)spotWithName:(NSString *)name andCoord:(CLLocationCoordinate2D)coord {
    return [[Pin alloc] initWithName:name andCoord:coord];
}

- (NSString *)title {
    return _name;
}

- (NSString *)subtitle {
    return [_createdAt description];
}

- (NSString *)description {
    return [NSString stringWithFormat:@"%@ [%@]", _name, _createdAt];
}

查看控制器实施：

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import "Pin.h"


@interface ViewController ()<MKMapViewDelegate, CLLocationManagerDelegate,UITextFieldDelegate>

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

@property (weak, nonatomic) IBOutlet UILabel *latitude;

@property (weak, nonatomic) IBOutlet UITextField *nameInput;



@property (strong, nonatomic) CLLocationManager *locationManager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _mapView.showsUserLocation=YES;
    _mapView.showsBuildings=YES;
    _locationManager = [[CLLocationManager alloc] init];

    [_locationManager requestAlwaysAuthorization];
    [_locationManager startUpdatingLocation]; 

    _mapView.delegate = self;
    _locationManager.delegate=self;
}


- (IBAction)userLoc:(UIButton *)sender {
    MKCoordinateRegion region = MKCoordinateRegionMake(_mapView.userLocation.coordinate, MKCoordinateSpanMake( 37.78583400, 122.40641700));

    [_mapView setRegion:region animated:NO];
}




#pragma mark - CCLocationManagerDelegate methods

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {

    CLLocation *loc = [locations objectAtIndex:0];

    _latitude.text = [NSString stringWithFormat:@"%g º", loc.coordinate.latitude];
}
#pragma mark - MKMapViewDelegate methods

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
    _mapView.centerCoordinate = userLocation.location.coordinate;
}
#pragma mark - UITextFieldDelegate methods
- (BOOL)textFieldShouldReturn:(UITextField *)nameInput {
    Pin *pin = [Pin spotWithName:nameInput.text andCoord:_mapView.userLocation.coordinate];

    [_mapView addAnnotation:pin];

    nameInput.text = @"";
    [nameInput resignFirstResponder];

    return NO;
}

@end

Answer 1

基本上，缺少一行：

_nameInput.delegate=self;

如果我在实现上有一个UITextfield协议，我必须分配它的委托，在这种情况下，它是自己的，如mapKit和CCLocation Manager

MapKit注释问题：无法在地图上创建新的点

1 个答案: