Question

我正在研究estimote beacon。

我尝试在切换Case“立即”时呈现ViewController。但是当我加载视图时，我有一个警告：

2014-03-13 02：44：26.017 ProximityDemo [856：60b]警告：尝试在窗口层次结构中显示其视图！

为什么？我认为当我在使用新视图时，presentView方法仍在工作。

此外，当我在新视图中时，我希望在我处于Case“Near”时弹出旧视图

我想我必须在新的ViewController中实现所有代码？（presentProductViewController）有没有办法让所有接近/距离控制只在一个控制器中？

这是我的代码：

ESTViewController：

#import "ESTViewController.h"
#import <ESTBeaconManager.h>
#import "PresentProductViewController.h"

@interface ESTViewController () <ESTBeaconManagerDelegate>

@property (nonatomic, strong) ESTBeaconManager* beaconManager;
@property (nonatomic, strong) ESTBeacon* selectedBeacon;

@end

@implementation ESTViewController

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

/////////////////////////////////////////////////////////////
// setup Estimote beacon manager

// craete manager instance
self.beaconManager = [[ESTBeaconManager alloc] init];
self.beaconManager.delegate = self;
self.beaconManager.avoidUnknownStateBeacons = YES;

// create sample region object (you can additionaly pass major / minor values)
ESTBeaconRegion* region = [[ESTBeaconRegion alloc] initWithProximityUUID:ESTIMOTE_IOSBEACON_PROXIMITY_UUID
                                                              identifier:@"EstimoteSampleRegion"];

// start looking for estimote beacons in region
// when beacon ranged beaconManager:didRangeBeacons:inRegion: invoked
[self.beaconManager startRangingBeaconsInRegion:region];



}

-(void)beaconManager:(ESTBeaconManager *)manager
 didRangeBeacons:(NSArray *)beacons
        inRegion:(ESTBeaconRegion *)region
{
if([beacons count] > 0)
{

    if(!self.selectedBeacon)
    {
        // initialy pick closest beacon
        self.selectedBeacon = [beacons objectAtIndex:0];
    }
    else
    {
        for (ESTBeacon* cBeacon in beacons)
        {
            // update beacon it same as selected initially
            if([self.selectedBeacon.major unsignedShortValue] == [cBeacon.major unsignedShortValue] &&
               [self.selectedBeacon.minor unsignedShortValue] == [cBeacon.minor unsignedShortValue])
            {
                self.selectedBeacon = cBeacon;
            }
        }
    }



    // beacon array is sorted based on distance
    // closest beacon is the first one

    NSString* labelText = [NSString stringWithFormat:
                           @"Major: %i, Minor: %i\nRegion: ",
                           [self.selectedBeacon.major unsignedShortValue],
                           [self.selectedBeacon.minor unsignedShortValue]];

    // calculate and set new y position
    switch (self.selectedBeacon.proximity)
    {
        case CLProximityUnknown:
        {
            labelText = [labelText stringByAppendingString: @"Unknown"];
            break;
        }
        case CLProximityImmediate:
        {
            labelText = [labelText stringByAppendingString: @"Immediate"];

            PresentProductViewController *showViewController = [[PresentProductViewController alloc] initWithNibName:@"PresentProductViewController" bundle:nil];

            [self presentViewController:showViewController animated:YES completion:nil];

            break;
        }
        case CLProximityNear:
        {
            labelText = [labelText stringByAppendingString: @"Near"];
            break;

            //[self.navigationController popToRootViewControllerAnimated:YES];
            //ESTViewController *initViewController = [[ESTViewController alloc]init];
            //[self presentViewController:initViewController animated:YES completion:nil];
        }
        case CLProximityFar:
        {
            labelText = [labelText stringByAppendingString: @"Far"];
            break;
        }

        default:
            break;
    }

    self.distanceLabel.text = labelText;
}
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

PresentProductViewController：

#import "PresentProductViewController.h"
#import <ESTBeaconManager.h>
#import "ESTViewController.h"

@interface PresentProductViewController () <ESTBeaconManagerDelegate>

@property (nonatomic, strong) ESTBeaconManager* beaconManager;
@property (nonatomic, strong) ESTBeacon* selectedBeacon;

@end

@implementation PresentProductViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[self.activityIndicator startAnimating];

/////////////////////////////////////////////////////////////
// setup Estimote beacon manager

// craete manager instance
self.beaconManager = [[ESTBeaconManager alloc] init];
self.beaconManager.delegate = self;
self.beaconManager.avoidUnknownStateBeacons = YES;

// create sample region object (you can additionaly pass major / minor values)
ESTBeaconRegion* region = [[ESTBeaconRegion alloc] initWithProximityUUID:ESTIMOTE_IOSBEACON_PROXIMITY_UUID
                                                              identifier:@"EstimoteSampleRegion"];

// start looking for estimote beacons in region
// when beacon ranged beaconManager:didRangeBeacons:inRegion: invoked
[self.beaconManager startRangingBeaconsInRegion:region];


}

-(void)beaconManager:(ESTBeaconManager *)manager
 didRangeBeacons:(NSArray *)beacons
        inRegion:(ESTBeaconRegion *)region
{
if([beacons count] > 0)
{

    if(!self.selectedBeacon)
    {
        // initialy pick closest beacon
        self.selectedBeacon = [beacons objectAtIndex:0];
    }
    else
    {
        for (ESTBeacon* cBeacon in beacons)
        {
            // update beacon it same as selected initially
            if([self.selectedBeacon.major unsignedShortValue] == [cBeacon.major unsignedShortValue] &&
               [self.selectedBeacon.minor unsignedShortValue] == [cBeacon.minor unsignedShortValue])
            {
                self.selectedBeacon = cBeacon;
            }
        }
    }



    // beacon array is sorted based on distance
    // closest beacon is the first one

    self.labelText.text = [NSString stringWithFormat:
                           @"Major: %i, Minor: %i\nRegion: ",
                           [self.selectedBeacon.major unsignedShortValue],
                           [self.selectedBeacon.minor unsignedShortValue]];

    // calculate and set new y position
    switch (self.selectedBeacon.proximity)
    {
        case CLProximityUnknown:
        {
            self.labelText.text = [self.labelText.text stringByAppendingString: @"Unknown"];
            break;
        }
        case CLProximityImmediate:
        {
            self.labelText.text = [self.labelText.text stringByAppendingString: @"Immediate"];
            break;
        }
        case CLProximityNear:
        {
            self.labelText.text = [self.labelText.text stringByAppendingString: @"Near"];
            break;

            //UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main.storyboard" bundle:nil];
            //UIViewController *initViewController = [storyBoard instantiateInitialViewController];

            //[self.navigationController pushViewController:initViewController animated:YES];

            //ESTViewController *initViewController = [[ESTViewController alloc]init];
            //[self presentViewController:initViewController animated:YES completion:nil];

            //[self.navigationController popToRootViewControllerAnimated:YES];

        }
        case CLProximityFar:
        {
            self.labelText.text = [self.labelText.text stringByAppendingString: @"Far"];
            break;
        }

        default:
            break;
    }

}
}

-(void)viewDidDisappear:(BOOL)animated
{
[self.activityIndicator stopAnimating];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

我确定我做错了。谢谢你的帮助。

Answer 1

即使您提交ESTBeaconManager，didRangeBeacons:inRegion也可能会通过PresentProductViewController不断提供最新更改。我认为以下是会发生的事情：

ESTViewController使用非空信号数组调用didRangeBeacons:inRegion。
所选信标的proximity属性为CLProximityImmediate，PresentProductViewController以模态显示。
在呈现（ not 呈现）时，将通过新的更改调用viewcontroller，ESTViewController＆＃39; s didRangeBeacons:inRegion。同样，信标具有即时接近性，并且PresentProductViewController的新实例以模态呈现。

来自ViewController Programming Guide

任何视图控制器对象都可以一次呈现单个视图控制器。

如果上面列出的假设是正确的，那么您试图同时以模态方式呈现多个视图控制器，这不是有效的操作。当视图消失时，您可以尝试停止信标的测距，然后在显示时再次开始测距。这将阻止信标管理器在无法呈现视图控制器的情况下通知ESTViewController更改。覆盖viewWillDisappear和viewWillAppear方法来实现此目的：

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.beaconManager stopRangingBeaconsInRegion:region];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.beaconManager startRangingBeaconsInRegion:region];
}

Estimote信标接近演示推送ViewController on＆＃34;立即＆＃34;案件

1 个答案: