У меня проблема при загрузке представления, он загрузит UIBarButtonItem, но тогда я должен установить его в nil в «mostra_filtro_btn», но затем снова в «load_map» мне нужно установить это, но оно не появляется. Вот мой код:UIBarButtonItem не отображается
//
// FirstViewController.m
// House Finder
//
// Created by Giovanni Poli on 12/05/15.
// Copyright (c) 2015 Giovanni Poli. All rights reserved.
//
#import "MapViewController.h"
#import <QuartzCore/QuartzCore.h>
#import "Reachability.h"
#import "UIKit/UIKit.h"
#import <Foundation/Foundation.h>
#import "FiltroViewController.h"
@interface MapViewController()
@end
@implementation MapViewController
@synthesize filtro_controller,overlay_filtro_counter,mappa_controller;
-(void)load_map{
NSLog(@"load_map");
[mapView removeFromSuperview];
[mappa_controller.view removeFromSuperview];
[filtro_controller.view removeFromSuperview];
UIBarButtonItem *Button = [[UIBarButtonItem alloc] initWithTitle:@"Filtro" style:UIBarButtonItemStyleBordered target:self action:@selector(mostra_filtro_btn:)];
[Button setTitle:@"Filtro"];
[Button setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName,nil]forState:UIControlStateNormal];
self.navigationItem.rightBarButtonItem = Button;
}
- (id) init{
filtro_controller = [[FiltroViewController alloc]init];
[self.view addSubview:filtro_controller.view];
[self addChildViewController:filtro_controller];
return self;
}
- (void)viewDidLoad {
self.title = @"Mappa";
self.navigationItem.title = @"House Finder";
self.navigationController.navigationBar.translucent = FALSE;
UIBarButtonItem *Button = [[UIBarButtonItem alloc] initWithTitle:@"Filtro" style:UIBarButtonItemStyleBordered target:self action:@selector(mostra_filtro_btn:)];
[Button setTitle:@"Filtro"];
[Button setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName,nil]forState:UIControlStateNormal];
self.navigationItem.rightBarButtonItem = Button;
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"];
NSData *content = [[NSData alloc] initWithContentsOfFile:filePath];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:content options:kNilOptions error:nil];
NSArray * json_all = [json objectForKey:@"results"];
mapView = [[MKMapView alloc]initWithFrame:CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height-40)];
mapView.delegate = self;
mapView.showsUserLocation = NO;
mapView.userInteractionEnabled = YES;
CLLocationCoordinate2D annotationCoord;
self.view.userInteractionEnabled = YES;
NSDictionary * temp;
for (id object in json_all) {
temp = object[@"titolo"];
annotationCoord.latitude = [object[@"lat"] floatValue];
annotationCoord.longitude = [object[@"lon"] floatValue];
MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init];
annotationPoint.coordinate = annotationCoord;
annotationPoint.title = object[@"titolo"];
annotationPoint.subtitle = object[@"agenzia"];
[mapView addAnnotation:annotationPoint];
}
[mapView showAnnotations:[mapView annotations] animated:YES];
[self.view addSubview:mapView];
[self.view setNeedsDisplay];
}
- (IBAction) mostra_filtro_btn: (id)sender{
NSLog(@"mostra_filtro_btn");
self.navigationItem.rightBarButtonItem = nil;
filtro_controller = [[FiltroViewController alloc]init];
[self.view addSubview:filtro_controller.view];
[self addChildViewController:filtro_controller];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapViews viewForAnnotation:annotation{
if (annotation == mapViews.userLocation) return nil;
MKPointAnnotation * temp = annotation;
MKAnnotationView * m = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"casa"];
m.canShowCallout = YES;
m.enabled = YES;
m.userInteractionEnabled = YES;
NSString * icon_file = [NSString stringWithFormat:@"%@.png",temp.subtitle];
m.image = [UIImage imageNamed:icon_file];
return m;
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
NSLog(@"overlay prezzo");
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
Try: 'self.navigationController.navigationItem.rightBarButtonItem = nil; не // Или [self.navigationItem setRightBarButtonItem: ноль анимированный: NO]; ' вместо ' self.navigationItem.rightBarButtonItem = ноль; ' в вашем mostra_filtro_btn действия метода – iYoung