UITabBarViewController 的底部 tabBa

iOS pushViewController 时候隐藏 TabBar 的可以用

@interfaceUIViewController (UINavigationControllerItem)

@property(nonatomic,readonly,strong)UINavigationItem*navigationItem;// Created on-demand so that a view controller may customize its navigation appearance.

@property(nonatomic)BOOL hidesBottomBarWhenPushed __TVOS_PROHIBITED;// If YES, then when this view controller is pushed into a controller hierarchy with a bottom bar (like a tab bar), the bottom bar will slide out. Default is NO.

这是系统提供的 UINavigationViewController 的方法。你只需要在被push 的 UIViewcontroller 的初始化方法中添加这个属性就行。

self.hidesBottomBarWhenPushed = YES;

这样有2个问题

1. 是做 pushViewController transition 过渡的时候，动画中会看到 tabBar 被移出去，尤其是被push 的viewController 的背景色反差很大的时候，体验很差。
2. presentViewController 的时候无法使用这个方法。

---

解决方法：

自己控制 UITabBarViewController 的 bottom tabBar。setFrame的方法控制。

- (void)hideTabBar {
[self setTabBarHidden:YES];
}

- (void)showTabBar {
[self setTabBarHidden:NO];
|}

- (void) setTabBarHidden:(BOOL)hidden {

CGRect screenRect = [[UIScreen mainScreen] bounds];

floatfHeight = screenRect.size.height;

if(UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))

fHeight = screenRect.size.width;

if(!hidden) fHeight -=self.tabBar.frame.size.height;

[UIViewanimateWithDuration:0.25 animations: ^{

for(UIView*view in self.view.subviews) {

if([view isKindOfClass:[UITabBar class]]) {

[view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];

}else{

if(hidden) [viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];

}

}

}completion:^(BOOLfinished) {

if(!hidden) {

[UIViewanimateWithDuration:0.25animations: ^{

for(UIView*viewinself.view.subviews) {

if(![viewisKindOfClass:[UITabBarclass]])

[viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];

}

}];

}

}];

}