消除Xcode 的警告提示

参考链接：http://www.cocoachina.com/ios/20141218/10678.html

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
        //这里写的代码出现的警告会不显示-Wdeprecated-declarations类型的警告
        self.bezelView.alpha = self.opacity;
#pragma clang diagnostic pop