ios7以上版本怎么自定义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：
UIView *view = [[UIView
alloc]initWithFrame:CGRectMake(0,0,320,70)];
view.backgroundColor = [UIColor
redColor];
[self.navigationController.navigationBar addSubview:view];

就可以了