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我有一個使用KVO功能的代碼。錯誤:執行中斷,原因:EXC_BAD_INSTRUCTION(code = EXC_I386_INVOP,subcode = 0x0)
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
...
let oldRect = change?[NSKeyValueChangeOldKey] as! NSRect
所以,當我試圖投價值的NSRect我收到錯誤:
error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0).
和對象是的NSRect類型的對象:
(lldb) po change?[NSKeyValueChangeOldKey]
▿ Optional<AnyObject>
- Some : NSRect: {{293, 21}, {108, 108}}