2016.11.15
//不添加这两个方法获得的尺寸会是xib里面未完成autolayout适配的尺寸,storyBoard同理,
[self.viewsetNeedsLayout];
[self.viewlayoutIfNeeded];
如果需要在加载xib之后修改frame或者获取frame需要在
- (void)viewDidAppear:(BOOL)animated;中修改或者获取
详见:http://blog.csdn.net/x567851326/article/details/52316867