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：

weakvar 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.

@objcfuncbatteryLevelChanged(notification:NSNotification){
//dostuff
}