#define WMARCRelease void retainedObject = __bridge void __VA_ARGS__; id unretainedObject = __bridge_transfer idretainedObject; unretainedObject = nil转成swift
let retainedObject = Unmanaged<AnyObject>.fromOpaque(UnsafeRawPointer(bitPattern: <#bitPattern#>)!).takeRetainedValue()
let unretainedObject = retainedObject as? NSObject
unretainedObject = nil
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