注释标注标题不会改变 [英] Annotation callout title does not change
问题描述
我已经搜索过，但没有找到任何解决我的问题的方法.我想更改已添加的引脚.这是我的代码.我在控制台中收到Code Here".
I have searched but i didn't found any solution to my problem. I want to change already added pin. And here is my code. I'm getting "Code Here" in console.
我有.h
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView;
myViewController.m
myViewController.m
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView
{
userPins *myAnnot = (userPins *)annotationView.annotation;
[myAnnot setTitle:@"o21"];
NSLog(@"Code here!");
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
static NSString *identifier = @"userPins";
if ([annotation isKindOfClass:[userPins class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
} else {
annotationView.annotation = annotation;
}
annotationView.image = [UIImage imageNamed:@"mapMarker-blue.png"];
annotationView.calloutOffset = CGPointMake(0,0);
UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
annotationView.rightCalloutAccessoryView = detailButton;
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
return annotationView;
}
return nil;
}
在 userPins.m 中我有.但我也没有用 setTitle 这样做.
In userPins.m i have. But i didn't do this with setTitle too.
- (void)setTitle:(NSString *)title {
if (_subtitle != subtitle) {
[_subtitle release];
_subtitle = [subtitle retain];
}
}
- (NSString *)title{
return @"okan";
}
@AnnaKarenina
@AnnaKarenina
我都试过了.但是 setTitle 没有运行.我要疯了！这是我所有的代码.而且我没有收到错误.
I have tried all. But setTitle is not running. I'm going crazy! This is all of my code. And I'm not getting errors.
userpins.m
userpins.m
#import "userPins.h"
@implementation userPins
@synthesize fbid = _fbid;
@synthesize coordinate = _coordinate;
@synthesize title = _title;
@synthesize subtitle = _subtitle;
- (id)initWithfbid:(NSInteger*)fbid
coordinate:(CLLocationCoordinate2D)coordinate {
if ((self = [super init])) {
_fbid = fbid;
_coordinate = coordinate;
}
return self;
}
- (NSString *)subtitle{
return @"Anything";
}
- (NSString *)title{
return @"Something";
}
- (void)dealloc
{
[_title release];
[_subtitle release];
[super dealloc];
}
@end
userPins.h
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface userPins : NSObject <MKAnnotation> {
NSInteger *_fbid;
CLLocationCoordinate2D _coordinate;
NSString *_title;
NSString *_subtitle;
}
@property (nonatomic, readonly) NSInteger *fbid;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
- (id)initWithfbid:(NSInteger*)fbid coordinate:(CLLocationCoordinate2D)coordinate;
@end
viewController.m
viewController.m
#import "lociseViewController.h"
#import "ASIHTTPRequest.h"
#import "SBJSON.h"
#import "userPins.h"
@implementation lociseViewController
@synthesize mapView = _mapView;
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
// Add new method above refreshTapped
- (void)plotPositions:(NSString *)responseString {
for (id<MKAnnotation> annotation in _mapView.annotations) {
[_mapView removeAnnotation:annotation];
}
NSDictionary * root = [responseString JSONValue];
NSArray *data = [root objectForKey:@"data"];
for (NSArray * row in data) {
NSInteger * fbid = (NSInteger *)[row objectAtIndex:0];
NSNumber * latitude = [row objectAtIndex:1];
NSNumber * longitude = [row objectAtIndex:2];
CLLocationCoordinate2D coordinate;
coordinate.latitude = latitude.doubleValue;
coordinate.longitude = longitude.doubleValue;
userPins *annotation = [[[userPins alloc] initWithfbid:fbid coordinate:coordinate] autorelease];
[_mapView addAnnotation:annotation];
}
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
// 1
MKCoordinateRegion mapRegion = [_mapView region];
CLLocationCoordinate2D centerLocation = mapRegion.center;
// 2
NSString *jsonFile = [[NSBundle mainBundle] pathForResource:@"command" ofType:@"json"];
NSString *formatString = [NSString stringWithContentsOfFile:jsonFile encoding:NSUTF8StringEncoding error:nil];
NSString *json = [NSString stringWithFormat:formatString, centerLocation.latitude, centerLocation.longitude, 0.5*METERS_PER_MILE];
NSURL *url = [NSURL URLWithString:@"http://localhost/users.json"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
request.requestMethod = @"POST";
//request.defaultResponseEncoding = NSISOLatin1StringEncoding;
//[request addRequestHeader:@"Content-Encoding" value:@"windows-1255"];
[request addRequestHeader:@"Content-Type" value:@"application/json"];
[request appendPostData:[json dataUsingEncoding:NSUTF8StringEncoding]];
[request setDefaultResponseEncoding:NSUTF8StringEncoding];
// 5
[request setDelegate:self];
[request setCompletionBlock:^{
NSString *responseString = [request responseString];
NSLog(@"Response: %@", responseString);
[self plotPositions:responseString];
}];
[request setFailedBlock:^{
NSError *error = [request error];
NSLog(@"Error: %@", error.localizedDescription);
}];
// 6
[request startAsynchronous];
//CLLocationManager *locationManager;
//locationManager.delegate = self;
[super viewDidLoad];
}
- (void)viewWillAppear:(BOOL)animated {
// 1
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = 35.333070;
zoomLocation.longitude = 33.302875;
// 2
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 50*METERS_PER_MILE, 3*METERS_PER_MILE);
// 3
MKCoordinateRegion adjustedRegion = [_mapView regionThatFits:viewRegion];
// 4
[_mapView setRegion:adjustedRegion animated:YES];
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView
{
userPins *myAnnot = (userPins *)annotationView.annotation;
[myAnnot setTitle:@"o21"];
NSLog(@"Title: %@", annotationView.annotation.subtitle);
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
static NSString *identifier = @"userPins";
if ([annotation isKindOfClass:[userPins class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
} else {
annotationView.annotation = annotation;
}
annotationView.image = [UIImage imageNamed:@"mapMarker-blue.png"];
annotationView.calloutOffset = CGPointMake(0,0);
UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
annotationView.rightCalloutAccessoryView = detailButton;
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
return annotationView;
}
return nil;
}
- (void)viewDidUnload
{
[self setMapView:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)dealloc {
[_mapView release];
[super dealloc];
}
@end
viewController.h
viewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#define METERS_PER_MILE 1609.344
@interface lociseViewController : UIViewController <MKMapViewDelegate> {
MKMapView *_mapView;
}
@property (nonatomic, retain) IBOutlet MKMapView *mapView;
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView;
@end
推荐答案
userPins.m 中的 setTitle: 和 title 方法看起来不对.
The setTitle: and title methods in userPins.m don't look right.
setTitle: 方法正在查看和设置副标题而不是标题.title 方法返回一个常量字符串，所以即使 setTitle: 设置了标题 ivar，注释也会返回相同的常量字符串.
The setTitle: method is looking at and setting subtitle instead of title. The title method returns a constant string so even if setTitle: set the title ivar, the annotation will return the same constant string.
您可以修复这些方法，或者只是将 title 和 subtitle 声明为 copy 属性并在 @synthesize 中将它们声明为userPins.m(并在 dealloc 中发布).那么你根本不需要这些方法(它们会自动实现).
You could fix those methods or just declare title and subtitle as copy properties and @synthesize them in userPins.m (and release in dealloc). Then you don't need those methods at all (they will be implemented automatically).
顺便说一句，当你添加注解时，一定要把标题设置成一些东西(即使是一个空格)，否则标注将不会显示并且didSelectAnnotationView不会被调用.
By the way, when you add the annotation, be sure to set the title to something (even a single space) otherwise the callout will not display and didSelectAnnotationView will not be called.
一个单独的问题是viewForAnnotation 中的内存泄漏.您应该在 alloc+init annotationView 的位置添加一个 autorelease.
A separate problem is a memory leak in viewForAnnotation. You should add an autorelease where you alloc+init annotationView.
关于更新的代码:
在 userPins.m 中，它仍然返回 subtitle 和 title 的常量字符串，从而隐藏更改的 ivars.改为:
In userPins.m, it still returns constant strings for subtitle and title thus hiding the changed ivars. Change it to:
- (id)initWithfbid:(NSInteger*)fbid
coordinate:(CLLocationCoordinate2D)coordinate {
if ((self = [super init])) {
_fbid = fbid;
_coordinate = coordinate;
//init the ivars here...
_title = @"Something";
_subtitle = @"Anything";
}
return self;
}
/* comment these methods out
- (NSString *)subtitle{
return @"Anything";
}
- (NSString *)title{
return @"Something";
}
*/
一个新的、不相关的问题是 fbid 应该是 NSNumber * 而不是 NSInteger *.NSInteger 不是一个对象，NSNumber 是 JSON 解析器最有可能给你的.
A new, unrelated problem is that fbid should probably be NSNumber * instead of NSInteger *. NSInteger is not an object and an NSNumber is what the JSON parser is most likely giving you.
这篇关于注释标注标题不会改变的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
