ios簡單更改系統TabBar的高度

- (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;

    //此處需要設置barStyle，否則顏色會分成上下兩層

}