在MainTabBarController.m文件中寫(xiě)入下面代碼：

// 重寫(xiě)tabbar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 = [UIColor blackColor];

//此處需要設(shè)置barStyle，否則顏色會(huì)分成上下兩層

self.tabBar.barStyle = UIBarStyleBlack;

}