1、默认的UITabBarController不支持四个方向，但可以给UITabBarController增加一个类别，实现旋转；具体做法：
在工程添加一个.h和.m文件如下：
//Rotation.h
#import <Foundation/Foundation.h>
@interface UITabBarController(Rotation)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation;
@end
#import "Rotation.h"
@implementation UITabBarController(Rotation)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
returnYES;
}
@end
重新编译，运行后UITabBarController就可以支持四个方向了；
2、进一步，如果UITabBarController包含多个ViewController，如A,B,C三个；但我们只想A,B,支持四个方向，而C只支持一个方向，则在
//Rotation.m
#import "Rotation.h"
@implementation UITabBarController(Rotation)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if（[[self selectedViewController] isKindOfClass:[C class]]）{
return NO;
}
return YES;
}
@end
3、隐藏底边的UITabBar
(1)假如你在某一个ViewController中隐藏UITabBar，则可以在该控制器中添加下面的函数
- (void)viewDidAppear:(BOOL)animated{
self.hidesBottomBarWhenPushed ＝ YES；
}
(2)为了将某个视图全屏显示，而隐藏UITabBar，添加下面的函数
- (void)HideTabBar:(BOOL)hidden{
[UIViewbeginAnimations:nilcontext:NULL];
[UIViewsetAnimationDuration:0];
for(UIView *viewinself.tabBarController.view.subviews){
if([viewisKindOfClass:[UITabBarclass]]){ //处理UITabBar视图
if (hidden) {
[viewsetFrame:CGRectMake(view.frame.origin.x, 480, view.frame.size.width,view.frame.size.height)];
} else {
[viewsetFrame:CGRectMake(view.frame.origin.x, 480-48, view.frame.size.width,view.frame.size.height)];
}
}else{ //处理其它视图
if (hidden) {
[viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width,480)];
} else {
[viewsetFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width,480-48)];
}
}
}
[UIViewcommitAnimations];
}