- (void)viewDidLayoutSubviews {

[super viewDidLayoutSubviews];

CGRect frame = self.tabBar.frame;

frame.size.height = 55;

frame.origin.y = self.view.frame.size.height - frame.size.height;

self.tabBar.frame = frame;

self.tabBar.backgroundColor = mRGBToColor(0xeaeaea);

self.tabBar.barStyle = UIBarStyleBlack;

//此处需要设置barStyle，否则颜色会分成上下两层

}