centralManager方法不被稱爲

Question

我是Android開發人員，轉向iOS，因此請耐心等待iOS開發的基礎知識。

我有以下代碼：

這裏是.m文件：

#import "BlueToothLEManager.h" 
#import "Constants.h" 

@implementation BlueToothLEManager 

@synthesize mBTCentralManager; 


-(void)initializeCBCentralManager{ 
    NSLog(@"initializing CBCentral Manager"); <--- This is being logged 
    mBTCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil]; 

} 

#pragma mark - CBCentralManagerDelegate 

// method called whenever you have successfully connected to the BLE peripheral 
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral 
{ 
} 

// CBCentralManagerDelegate - This is called with the CBPeripheral class as its main input parameter. This contains most of the information there is to know about a BLE peripheral. 
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI 
{ 
    NSLog(@"Discovered %@ at %@", peripheral.name, RSSI); 
} 

-(void)centralManagerDidUpdateState:(CBCentralManager *)central{ 
    NSLog(@"Start scan"); <---- This is NOT being logged. 
    if(central.state != CBCentralManagerStatePoweredOn){ 
     return; 
    } 
    if(central.state == CBCentralManagerStatePoweredOn){ 
     NSLog(@"Scanning for BTLE device"); 
     [mBTCentralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:DEVICE_NAME]] options:@{ CBCentralManagerScanOptionAllowDuplicatesKey : @YES }]; 
    } 
} 
@end 

這裏是.h文件：

#import <Foundation/Foundation.h> 

@import CoreBluetooth; 

@interface BlueToothLEManager : NSObject < CBCentralManagerDelegate, CBPeripheralDelegate>{ 
    CBCentralManager *mBTCentralManager; 
} 

@property (strong, retain) CBCentralManager *mBTCentralManager; 

-(void) initializeCBCentralManager; 


@end 

當我打電話initializeCBCentralManager一切似乎都工作，但由於某種原因centralManagerDidUpdateState方法沒有被調用。有人能告訴我我做錯了什麼嗎？

Answer 1

當你的iVar與你的財產混淆時，你應該清理你的財產定義。如果你聲明一個屬性，你不需要聲明一個iVar。除非您需要支持變量的特定名稱，否則您也不需要@synthesize。如果您使用self.表示法，那麼您可以確定您指的是財產而不是iVar。

你的.h文件中應該是 -

@import CoreBluetooth; 

@interface BlueToothLEManager : NSObject < CBCentralManagerDelegate, CBPeripheralDelegate> 

@property (strong, retain) CBCentralManager *mBTCentralManager; 

-(void) initializeCBCentralManager; 

@end 

然後你.m文件將

#import "BlueToothLEManager.h" 
#import "Constants.h" 

@implementation BlueToothLEManager 


-(void)initializeCBCentralManager{ 
    NSLog(@"initializing CBCentral Manager"); 
    self.mBTCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil]; 

} 

#pragma mark - CBCentralManagerDelegate 

// method called whenever you have successfully connected to the BLE peripheral 
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral 
{ 
} 

// CBCentralManagerDelegate - This is called with the CBPeripheral class as its main input parameter. This contains most of the information there is to know about a BLE peripheral. 
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI 
{ 
    NSLog(@"Discovered %@ at %@", peripheral.name, RSSI); 
} 

-(void)centralManagerDidUpdateState:(CBCentralManager *)central{ 
    NSLog(@"Start scan"); 

    if(central.state == CBCentralManagerStatePoweredOn){ 
     NSLog(@"Scanning for BTLE device"); 
     [central scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:DEVICE_NAME]] options:@{ CBCentralManagerScanOptionAllowDuplicatesKey : @YES }]; 
    } 
} 
@end 

我測試了這一點，它的工作原理