我正在尝试使用我的应用中的Delegate和协议调用另一种方法。我需要将变量“myData”发送到另一个视图但由于某些原因它不起作用。我不知道代理和协议的实现我做错了什么。代表从不调用协议的动作。
抱歉，我对此很新。
BLEViewController.h
#import <UIKit/UIKit.h>
#import "BLE.h"
@protocol EnviarDatos <NSObject>
//Metodo que se manda llamar pero se implementa en otra clase
-(void) actualizaDatos:(NSData*)Data;
@end
@interface BLEViewController : UITableViewController <BLEDelegate>
{
//id <EnviarDatos> delegate;
}
@property (nonatomic,assign)id delegate;
@property (nonatomic, retain) NSData *myData;
+ (BLE*) theBLEObject;
- (void) scanForPeripherals;
- (IBAction)connect:(id)sender;
-(void) activaProtocolo;
@end
BLEViewController.m
//
// BLEViewController.m
// DL_RemoteBLE_02
//
// Created by Dave Lichtenstein on 3/16/14.
// Copyright (c) 2014 Dave Lichtenstein. All rights reserved.
//
#import "BLEViewController.h"
static BLE* ble;
static UILabel *statusLabel;
static NSString* connectionStatus = @"Not connected!";
@interface BLEViewController ()
@end
@implementation BLEViewController
@synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
if(ble==nil)
{
// Create our Bluetooth Low Energy object
//
ble = [[BLE alloc] init];
[ble controlSetup];
ble.delegate = self;
}
// Create a toolbar at the bottom of the screen to show status text, etc.
//
// get screen size
//
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
CGFloat toolbarHeight = 50.0;
CGFloat labelHeight = 50.0;
if(statusLabel==nil) // only create once
{
// create our status label object
//
statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, screenHeight-toolbarHeight-labelHeight, screenWidth, labelHeight)];
statusLabel.backgroundColor = [UIColor clearColor];
statusLabel.textColor = [UIColor blackColor];
statusLabel.font = [UIFont boldSystemFontOfSize:15];
statusLabel.text = @"Connection Status:";
}
// create a toolbar
//
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0,screenHeight-toolbarHeight,screenWidth,toolbarHeight)];
toolbar.tintColor = [UIColor blackColor];
/*UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 150, 20)];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blackColor];
label.font = [UIFont boldSystemFontOfSize:15];
label.text = @"Status:";
UIBarButtonItem *labeltext = [[UIBarButtonItem alloc] initWithCustomView:label];
UIBarButtonItem *button = [[UIBarButtonItem alloc]initWithTitle:@"" style:UIBarButtonItemStyleDone target:self action:nil];
NSArray *items = [NSArray arrayWithObjects:statusLabel, nil];
toolbar.items = items;
*/
[self.view addSubview:statusLabel];
[self.view addSubview:toolbar];
// Update our status label
statusLabel.text = connectionStatus;
_myData = [[NSData alloc]init];
delegate = self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//-------------------------------------------------------
// methods
/////////////////////////////////////////////////////////
+ (BLE*) theBLEObject
{
return ble;
}
-(void) connectionTimer:(NSTimer *)timer
{
if (ble.peripherals.count > 0)
{
[ble connectPeripheral:[ble.peripherals objectAtIndex:0]];
}
NSLog(@"connectionTimer"); // diag
}
// We call this when the view loads to try to connect to our bluetooth perepheral
//
- (void) scanForPeripherals
{
if (ble.activePeripheral)
if(ble.activePeripheral.state == CBPeripheralStateConnected)
{
statusLabel.text = @"Disconnectng from peripheral...";
[[ble CM] cancelPeripheralConnection:[ble activePeripheral]];
return;
}
if (ble.peripherals)
ble.peripherals = nil;
NSLog(@"scanning...");
statusLabel.text = @"Scanning for peripherals...";
[ble findBLEPeripherals:2];
[NSTimer scheduledTimerWithTimeInterval:(float)2.0 target:self selector:@selector(connectionTimer:) userInfo:nil repeats:NO];
//[indConnecting startAnimating];
}
- (IBAction)connect:(id)sender {
[self scanForPeripherals];
}
///////////////////////////////////////////////////////////
#pragma mark - BLE delegate
///////////////////////////////////////////////////////////
NSTimer *rssiTimer;
// When Connected, this will be called
-(void) bleDidConnect
{
NSLog(@"->Connected");
statusLabel.text = @"Connected!";
connectionStatus = @"Connected!";
// Schedule to read RSSI every 1 sec.
rssiTimer = [NSTimer scheduledTimerWithTimeInterval:(float)1.0 target:self selector:@selector(readRSSITimer:) userInfo:nil repeats:YES];
}
// When RSSI is changed, this will be called
-(void) bleDidUpdateRSSI:(NSNumber *) rssi
{
// Append the rssi value to our status label
//
NSString *temp = [NSString stringWithFormat:@"%@ (%@)", connectionStatus, rssi];
statusLabel.text = temp;
}
-(void) readRSSITimer:(NSTimer *)timer
{
[ble readRSSI];
}
// When data is comming, this will be called
-(void) bleDidReceiveData:(unsigned char *)data length:(int)length
{
NSData *d = [NSData dataWithBytes:data length:length];
_myData = [NSData dataWithBytes:data length:length];
NSString *s = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
NSLog(@"Datos en String %@",s);
//_datosdelegate = self;
//Is anyone listening
if([delegate respondsToSelector:@selector(actualizaDatos:)])
{
//send the delegate function with the amount entered by the user
[delegate actualizaDatos:_myData];
NSLog(@"Entro delegado");
}
}
- (void)bleDidDisconnect
{
NSLog(@"->Disconnected");
connectionStatus = @"Disconnected!";
statusLabel.text = @"Disconnected!";
[rssiTimer invalidate];
}
@end
sevenSegmentsViewController.h
#import <UIKit/UIKit.h>
#import "BLEViewController.h"
#import "BLE.h"
@interface sevenSegmentsViewController : UIViewController<EnviarDatos>{
UIImage *unoON;
UIImage *dosON;
UIImage *tresON;
UIImage *cuatroON;
UIImage *cincoON;
UIImage *seisON;
UIImage *sieteON;
UIImage *unoOFF;
UIImage *dosOFF;
UIImage *tresOFF;
UIImage *cuatroOFF;
UIImage *cincoOFF;
UIImage *seisOFF;
UIImage *sieteOFF;
}
@property (strong, nonatomic) IBOutlet UIImageView *uno;
@property (strong, nonatomic) IBOutlet UIImageView *dos;
@property (strong, nonatomic) IBOutlet UIImageView *tres;
@property (strong, nonatomic) IBOutlet UIImageView *cuatro;
@property (strong, nonatomic) IBOutlet UIImageView *cinco;
@property (strong, nonatomic) IBOutlet UIImageView *seis;
@property (strong, nonatomic) IBOutlet UIImageView *siete;
@end
sevenSegmentsViewController.m
//
// sevenSegmentsViewController.m
// iShield
//
// Created by Victor Carreño on 29/03/14.
// Copyright (c) 2014 RedBearLab. All rights reserved.
//
#import "sevenSegmentsViewController.h"
@interface sevenSegmentsViewController ()
@end
@implementation sevenSegmentsViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
unoOFF = [UIImage imageNamed:@"7segnh.png"];
dosOFF = [UIImage imageNamed:@"7segnv.png"];
tresOFF = [UIImage imageNamed:@"7segnv.png"];
cuatroOFF =[UIImage imageNamed:@"7segnh.png"];
cincoOFF = [UIImage imageNamed:@"7segnh.png"];
seisOFF = [UIImage imageNamed:@"7segnv.png"];
sieteOFF = [UIImage imageNamed:@"7segnh.png"];
unoON = [UIImage imageNamed:@"7segvh.png"];
dosON = [UIImage imageNamed:@"7segvv.png"];
tresON = [UIImage imageNamed:@"7segvv.png"];
cuatroON =[UIImage imageNamed:@"7segvh.png"];
cincoON = [UIImage imageNamed:@"7segvh.png"];
seisON = [UIImage imageNamed:@"7segvv.png"];
sieteON = [UIImage imageNamed:@"7segvh.png"];
_uno = [[UIImageView alloc]initWithImage:unoOFF];
_dos = [[UIImageView alloc]initWithImage:dosOFF];
_tres = [[UIImageView alloc]initWithImage:tresOFF];
_cuatro = [[UIImageView alloc]initWithImage:cuatroOFF];
_cinco = [[UIImageView alloc]initWithImage:cincoOFF];
_seis = [[UIImageView alloc]initWithImage:seisOFF];
_siete = [[UIImageView alloc]initWithImage:sieteOFF];
//BLEViewController *myBLE = [[BLEViewController alloc]init];
//BLE *myBLE = [BLEViewController theBLEObject];
//NSLog(@"%@", myBLE.myData);
BLEViewController *myBLE = [[BLEViewController alloc]init];
myBLE.delegate = self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#pragma mark Delegado de Actualizar datos
-(void) actualizaDatos :(NSData *)myData{
NSLog(@"Datos recividos");
NSLog(@"Imprimio mi data con exitos %@", myData);
}
@end
答案 0 :(得分：0)
简而言之，当我认为您希望将其设置为“sevenSegmentsViewController”的实例时，您的BLEViewController将其委托属性设置为“self”。结果是“if（[delegate respondsToSelector：...”测试失败，你永远不会调用actualizaDatos。如果你正确使用协议，你根本不需要测试“respondsToSelector”，因为根据定义，代表必须支持该协议。
编译器和IDE没有向您显示错误，因为您声明BLEViewController的属性只是键入“id”而不是
id<EnviarDatos>
如果你修改了属性声明，说你的委托必须支持正确的协议，你会立即看到突出显示的错误。