如何自定义NavigationBar的高度

-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
CGRect rect = self.navigationController.navigationBar.frame;
self.navigationController.navigationBar.frame = CGRectMake(rect.origin.x,rect.origin.y,rect.size.width,84);
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
CGRect rect = self.navigationController.navigationBar.frame;
self.navigationController.navigationBar.frame = CGRectMake(rect.origin.x,rect.origin.y,rect.size.width,44);

ios6可以用上面的的方法,ios7需要自定义view设置好高度,添加到navigationController.navigationBar上
你可以这么写：

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UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0,0,320,70)];
view.backgroundColor = [UIColor redColor];
[self.navigationController.navigationBar addSubview:view];