tabbar问题

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

//Rotation.m

#import "Rotation.h"

@implementation UITabBarController(Rotation)

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

return YES;

}

@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{

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:0];

 

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

if([view isKindOfClass:[UITabBar class]]){   //处理UITabBar视图

if (hidden) {

[view setFrame:CGRectMake(view.frame.origin.x, 480, view.frame.size.width, view.frame.size.height)];

} else {

[view setFrame:CGRectMake(view.frame.origin.x, 480-48, view.frame.size.width, view.frame.size.height)];

}

}else{   //处理其它视图

if (hidden) {

[view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 480)];

} else {

[view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, 480-48)];

}

}

}

[UIView commitAnimations];

}