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init CBCentralManager: Type of expression is ambiguous without more context
Trying to initialize a CBCentralManager in a Swift 4.2 project.
Get the error shown in comment:
import CoreBluetooth
class SomeClass: NSObject, CBCentralManagerDelegate {
// Type of expression is ambiguous without more context
let manager: CBCentralManager = CBCentralManager(delegate: self, queue: nil)
// MARK: - Functions: CBCentralManagerDelegate
func centralManagerDidUpdateState(_ central: CBCentralManager) { }
}
If I switch self out for nil the error goes away, so I think I'm missing something important from my conformance to CBCentralManagerDelegate...
Can I use the manager without a delegate; and if not, what do I need to do to resolve the error?
ios swift core-bluetooth cbcentralmanager
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
add a comment |
Trying to initialize a CBCentralManager in a Swift 4.2 project.
Get the error shown in comment:
import CoreBluetooth
class SomeClass: NSObject, CBCentralManagerDelegate {
// Type of expression is ambiguous without more context
let manager: CBCentralManager = CBCentralManager(delegate: self, queue: nil)
// MARK: - Functions: CBCentralManagerDelegate
func centralManagerDidUpdateState(_ central: CBCentralManager) { }
}
If I switch self out for nil the error goes away, so I think I'm missing something important from my conformance to CBCentralManagerDelegate...
Can I use the manager without a delegate; and if not, what do I need to do to resolve the error?
ios swift core-bluetooth cbcentralmanager
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
add a comment |
Trying to initialize a CBCentralManager in a Swift 4.2 project.
Get the error shown in comment:
import CoreBluetooth
class SomeClass: NSObject, CBCentralManagerDelegate {
// Type of expression is ambiguous without more context
let manager: CBCentralManager = CBCentralManager(delegate: self, queue: nil)
// MARK: - Functions: CBCentralManagerDelegate
func centralManagerDidUpdateState(_ central: CBCentralManager) { }
}
If I switch self out for nil the error goes away, so I think I'm missing something important from my conformance to CBCentralManagerDelegate...
Can I use the manager without a delegate; and if not, what do I need to do to resolve the error?
ios swift core-bluetooth cbcentralmanager
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
Trying to initialize a CBCentralManager in a Swift 4.2 project.
Get the error shown in comment:
import CoreBluetooth
class SomeClass: NSObject, CBCentralManagerDelegate {
// Type of expression is ambiguous without more context
let manager: CBCentralManager = CBCentralManager(delegate: self, queue: nil)
// MARK: - Functions: CBCentralManagerDelegate
func centralManagerDidUpdateState(_ central: CBCentralManager) { }
}
If I switch self out for nil the error goes away, so I think I'm missing something important from my conformance to CBCentralManagerDelegate...
Can I use the manager without a delegate; and if not, what do I need to do to resolve the error?
ios swift core-bluetooth cbcentralmanager
ios swift core-bluetooth cbcentralmanager
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
asked Nov 19 '18 at 22:21
MercutioMercutio
393525
393525
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The diagnostic here is misleading. The problem is you can't refer to self in the place you are (self there would be the class, not the instance).
There are a few ways to solve this, but a common way is a lazy property:
lazy var manager: CBCentralManager = {
return CBCentralManager(delegate: self, queue: nil)
}()
The other approach is a ! variable:
var manager: CBCentralManager!
override init() {
super.init()
manager = CBCentralManager(delegate: self, queue: nil)
}
Both are somewhat ugly, but they're about the best we can do in Swift currently.
Remember that the lazy approach won't create the CBCentralManager at all until the first time it's referenced, so it's a bit more common to use the ! version for this particular case.
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The diagnostic here is misleading. The problem is you can't refer to self in the place you are (self there would be the class, not the instance).
There are a few ways to solve this, but a common way is a lazy property:
lazy var manager: CBCentralManager = {
return CBCentralManager(delegate: self, queue: nil)
}()
The other approach is a ! variable:
var manager: CBCentralManager!
override init() {
super.init()
manager = CBCentralManager(delegate: self, queue: nil)
}
Both are somewhat ugly, but they're about the best we can do in Swift currently.
Remember that the lazy approach won't create the CBCentralManager at all until the first time it's referenced, so it's a bit more common to use the ! version for this particular case.
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
add a comment |
The diagnostic here is misleading. The problem is you can't refer to self in the place you are (self there would be the class, not the instance).
There are a few ways to solve this, but a common way is a lazy property:
lazy var manager: CBCentralManager = {
return CBCentralManager(delegate: self, queue: nil)
}()
The other approach is a ! variable:
var manager: CBCentralManager!
override init() {
super.init()
manager = CBCentralManager(delegate: self, queue: nil)
}
Both are somewhat ugly, but they're about the best we can do in Swift currently.
Remember that the lazy approach won't create the CBCentralManager at all until the first time it's referenced, so it's a bit more common to use the ! version for this particular case.
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
add a comment |
The diagnostic here is misleading. The problem is you can't refer to self in the place you are (self there would be the class, not the instance).
There are a few ways to solve this, but a common way is a lazy property:
lazy var manager: CBCentralManager = {
return CBCentralManager(delegate: self, queue: nil)
}()
The other approach is a ! variable:
var manager: CBCentralManager!
override init() {
super.init()
manager = CBCentralManager(delegate: self, queue: nil)
}
Both are somewhat ugly, but they're about the best we can do in Swift currently.
Remember that the lazy approach won't create the CBCentralManager at all until the first time it's referenced, so it's a bit more common to use the ! version for this particular case.
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
The diagnostic here is misleading. The problem is you can't refer to self in the place you are (self there would be the class, not the instance).
There are a few ways to solve this, but a common way is a lazy property:
lazy var manager: CBCentralManager = {
return CBCentralManager(delegate: self, queue: nil)
}()
The other approach is a ! variable:
var manager: CBCentralManager!
override init() {
super.init()
manager = CBCentralManager(delegate: self, queue: nil)
}
Both are somewhat ugly, but they're about the best we can do in Swift currently.
Remember that the lazy approach won't create the CBCentralManager at all until the first time it's referenced, so it's a bit more common to use the ! version for this particular case.
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
answered Nov 19 '18 at 22:32
Rob NapierRob Napier
200k28294420
200k28294420
add a comment |
add a comment |
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