@optional requires check for respondsToSelector...

Adam Eberbach · Adam Eberbach · commit 08b78f0d9076 · 2015-01-11T18:43:11.000+11:00
diff --git a/iPhone Apps/rfduino/RfduinoManager.m b/iPhone Apps/rfduino/RfduinoManager.m
@@ -98,7 +98,9 @@ - (bool)isBluetoothLESupported
             
     }
 
-    [delegate shouldDisplayAlertTitled:@"Bluetooth LE Support" messageBody:message];
+    if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {
+        [delegate shouldDisplayAlertTitled:@"Bluetooth LE Support" messageBody:message];
+    }
 
     return NO;
 }
@@ -184,7 +186,9 @@ - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPe
     if (error.code) {
         cancelBlock = block;
 
-        [delegate shouldDisplayAlertTitled:@"Peripheral Disconnected with Error" messageBody:error.description];
+        if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {
+            [delegate shouldDisplayAlertTitled:@"Peripheral Disconnected with Error" messageBody:error.description];
+        }
         
     }
     else
@@ -265,7 +269,9 @@ - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(C
 {
     NSLog(@"didFailToConnectPeripheral");
 
-    [delegate shouldDisplayAlertTitled:@"Connect Failed" messageBody:error.description];
+    if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {
+        [delegate shouldDisplayAlertTitled:@"Connect Failed" messageBody:error.description];
+    }
 }
 
 - (void)centralManager:(CBCentralManager *)central didRetrieveConnectedPeripherals:(NSArray *)peripherals

Original file line number	Diff line number	Diff line change
`@@ -98,7 +98,9 @@ - (bool)isBluetoothLESupported`
`98`	`98`
`99`	`99`	`}`
`100`	`100`
`101`		`- [delegate shouldDisplayAlertTitled:@"Bluetooth LE Support" messageBody:message];`
	`101`	`+ if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {`
	`102`	`+ [delegate shouldDisplayAlertTitled:@"Bluetooth LE Support" messageBody:message];`
	`103`	`+ }`
`102`	`104`
`103`	`105`	`return NO;`
`104`	`106`	`}`
`@@ -184,7 +186,9 @@ - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPe`
`184`	`186`	`if (error.code) {`
`185`	`187`	`cancelBlock = block;`
`186`	`188`
`187`		`- [delegate shouldDisplayAlertTitled:@"Peripheral Disconnected with Error" messageBody:error.description];`
	`189`	`+ if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {`
	`190`	`+ [delegate shouldDisplayAlertTitled:@"Peripheral Disconnected with Error" messageBody:error.description];`
	`191`	`+ }`
`188`	`192`
`189`	`193`	`}`
`190`	`194`	`else`
`@@ -265,7 +269,9 @@ - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(C`
`265`	`269`	`{`
`266`	`270`	`NSLog(@"didFailToConnectPeripheral");`
`267`	`271`
`268`		`- [delegate shouldDisplayAlertTitled:@"Connect Failed" messageBody:error.description];`
	`272`	`+ if ([delegate respondsToSelector:@selector(shouldDisplayAlertTitled:messageBody:)]) {`
	`273`	`+ [delegate shouldDisplayAlertTitled:@"Connect Failed" messageBody:error.description];`
	`274`	`+ }`
`269`	`275`	`}`
`270`	`276`
`271`	`277`	`- (void)centralManager:(CBCentralManager )central didRetrieveConnectedPeripherals:(NSArray )peripherals`