Detect frequency value using iPhone - ios

Question

I'm developing an app that should detect a frequency of a certain sound. I based my app on Pitch Detector. I imported the files that are in the Pitch Detector example, then I fixed my code to accept this new classes. I post here my code to explain you my issue:
ViewController.h
#import <UIKit/UIKit.h>
#class RIOInterface;
#interface ViewController : UIViewController {
BOOL isListening;
float currentFrequency;
RIOInterface *rioRef; // HERE I'M GETTING ISSUE
}
- (IBAction)startListenWatermark:(UIButton *)sender;
#property(nonatomic, assign) RIOInterface *rioRef;
#property(nonatomic, assign) float currentFrequency;
#property(assign) BOOL isListening;
#pragma mark Listener Controls
- (void)startListener;
- (void)stopListener;
- (void)frequencyChangedWithValue:(float)newFrequency;
#end
ViewController.m
#synthesize isListening;
#synthesize rioRef;
#synthesize currentFrequency;
- (IBAction)startListenWatermark:(UIButton *)sender {
if (isListening) {
[self stopListener];
} else {
[self startListener];
}
isListening = !isListening;
}
- (void)startListener {
[rioRef startListening:self];
}
- (void)stopListener {
[rioRef stopListening];
}
- (void)frequencyChangedWithValue:(float)newFrequency {
NSLog(#"FREQUENCY: %f", newFrequency);
}
In the code you can see where's my issue and Xcode says: Existing instance variable 'rioRef' with assign attribute must be __unsafe_unretained. If I delete the row that give this errore the app doesn't calls the method [rioRef startListening:self]; and [rioRef stopListening];.
In the file RIOInterface.mm I'm getting another error in line 97 and Xcode suggested me to change it from:
RIOInterface* THIS = (RIOInterface *)inRefCon; --> RIOInterface* THIS = (RIOInterface *)CFBridgingRelease(inRefCon);
The it gives me this other error on the line 283:
callbackStruct.inputProcRefCon = self;
It says me this: Assigning to 'void' from incompatible type 'RIOInterface *const__strong', so I looked to the web and I found this solution:
callbackStruct.inputProcRefCon = (__bridge void*)self;
I'm not sure if it's right to do so or not, I hope you can help me to solve this issues, thank you in advice.

Answer 1

For the 2nd and the 3rd problem I solved by disabling the ARC for the file in which there are the code I provided above. For the first problem I solved by writing this code:
rioRef = [RIOInterface sharedInstance];