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I am trying to update target value of an action (HMCharacteristicWriteAction) but it always crashes with EXC_BAD_ACCESS (code=1, address=0x50).

My code snippet:

print("\(action) --> \(action.dynamicType)") // <HMCharacteristicWriteAction: 0x14cf7ba20> --> HMCharacteristicWriteAction
print("current: \(action.targetValue)") // current: 1
print("next: \(value) --> \(value.dynamicType)") // next: 0 --> Int

action.updateTargetValue(value, completionHandler: { [weak self] error -> Void in
       if let error = error {
           // display some message
           return
       }

       // do something else when succeeded
})

As you see, action is not nil and of correct type (HMCharacteristicWriteAction). I can read its targetValue successfully.

I analyzed the project using Product - Analyze, everything is ok (no any warnings). I also enabled Zombie in Scheme - Diagnostics but still no luck.

According to updateTargetValue documentation:

/*!
 * @brief This method is used to change target value for the characteristic.
 *
 * @param targetValue New target value for the characteristic.
 *
 * @param completion Block that is invoked once the request is processed. 
 *                   The NSError provides more information on the status of the request, error
 *                   will be nil on success.
 */
public func updateTargetValue(targetValue: NSCopying, completionHandler completion: (NSError?) -> Void)

What confuses me is targetValue: NSCopying. Does type Int of value conform 'NSCopying'? I did try value as NSCopying for targetValue but it is not better.

Could you please show me how to solve this problem? Is it ok to pass an Int to targetValue? What could cause this crash?

Thank you.

quanguyen
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1 Answers1

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An Int does not conform to NSCopying, use an NSNumber instead which does conform to NSCopying.

To convert an Int to NSNumber use 

[NSNumber numberWithInt:(int)];

or

SWIFT
    init(int value: Int32)
OBJECTIVE-C
- (NSNumber *)initWithInt:(int)value
Maria
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  • hi Maria, I did try NSNumber but things are not improved. My code is `let targetValue = NSNumber(integer: value)`, then `actionSet.updateTargetValue(targetValue, ...` --> still crash with `EXC_BAD_ACCESS(code = 1, address = 0x50)`. – quanguyen Mar 23 '16 at 02:31