swift内存泄露，与OC的混合

1. 避免内存泄露

1）由于闭包引用了self而可能导致的内存泄露，必须如下这样写:

weak var weakSelf = self;

nearByVM = BMKNearByViewModel(onResult: { (address) -> () in

weakSelf?.onGetAddress(address);

});

或者这样

nearByVM = BMKNearByViewModel(onResult: {[weak self] (address) -> () in

self?.onGetAddress(address);

});

2）使用delegate代理循环引用可能导致的内存泄露，必须如下这样写：

weak var delegate : BMKMapViewDelegate?

2. swift的枚举与oc的枚举比较

枚举值后加value

如
switch error.errorCode.value
{
case EMErrorServerNotReachable.value:
}

3. It's the same as the Objective-C API, but uses Swift's syntax.

NSNotificationCenter.defaultCenter().addObserver(
self,
selector: "batteryLevelChanged:",
name: UIDeviceBatteryLevelDidChangeNotification,
object: nil)

If your observer does not inherit from an Objective-C object, you must prefix your method with

@objc

in order to use it as a selector.

@objc func batteryLevelChanged(notification: NSNotification){
//do stuff
}