IOS开发之三级控制器的使用与自定义标签工具栏

IOS开发之三级控制器的使用与自定义标签工具栏

三级控制器的概念：UITabBarController- ->(管理) UINavigationController -->(管理) UIViewController

下面笔者就分享一下三级控制器的使用

#import "MainTabbarController.h"

 

#import "ProfileViewController.h"

#import "GroupViewController.h"

#import "SearchViewController.h"

#import "CommentViewController.h"

#import "MessageViewController.h"

 

@interface UITabBarController ()

 

@end

 

@implementation UITabBarController

 

 

- (void)viewDidLoad {

 

//创建三级控制器

[self _creatView];

 

//自定义标签工具栏

[self _newInitTabbar];

 

 

}

//创建三级控制器

- (void)_creatView{

 

 

//1.创建视图控制器并把视图控制器添加到数组中

ProfileViewController *profileCtrl = [[[ProfileViewController alloc] init] autorelease];

 

 

GroupViewController *groupCtrl = [[[GroupViewController alloc] init] autorelease];

SearchViewController *searchCtrl = [[[SearchViewController alloc] init] autorelease];

CommentViewController *commentCtrl = [[[CommentViewController alloc] init] autorelease];

MessageViewController *messageCtrl = [[[MessageViewController alloc] init] autorelease];

//将视图控制器存放到数组中

NSArray *viewCtrls = @[profileCtrl,groupCtrl,searchCtrl,commentCtrl,messageCtrl];

 

//2.创建导航控制器并把视图控制器交给导航控制器管理，并且把导航控制器也添加到连一个数组中

NSMutableArray *navCtrls = [[NSMutableArray alloc] init];

for(int i=0; i<5 ; i++) {

 

//取得视图控制器

UIViewController *viewCtrl = viewCtrls[i];

 

//创建导航控制器

UINavigationController *navCtrl = [[UINavigationController alloc] initWithRootViewController:viewCtrl];

[navCtrl.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg_normal"] forBarMetrics:UIBarMetricsDefault];

[navCtrls addObject:navCtrl];

 

}

 

//3.创建标签控制器，并把导航控制器交给标签控制器管理

self.viewControllers = navCtrls;

}

//自定义标签工具栏

 

- (void)_newInitTabbar {

 

//(1)移除工具栏上的按钮

//取得tabbar上的所有子视图

NSArray *views = [self.tabBar subviews];

for (UIView *view in views) {

[view removeFromSuperview];

}

 

//(2)设置背景

self.tabBar.backgroundImage = [UIImage imageNamed:@"navbg"];

 

//(3)创建按钮

CGFloat width = [UIScreen mainScreen].bounds.size.width;

//每一个按钮的宽度

CGFloat w = width/5;

for (int i=0; i<5; i++) {

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

NSString *imageName = [NSString stringWithFormat:@"%d",i+1];

[button setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

//设置frame

button.frame = CGRectMake((w-42)/2+w*i, 2, 42, 45);

//添加一个点击事件

[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];

[self.tabBar addSubview:button];

}

 

//(4)创建选中图片

_selectedImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"选中"]];

_selectedImg.frame = CGRectMake((w-53)/2.0, 2, 53, 45);

[self.tabBar addSubview:_selectedImg];

 

}

 

//按钮的点击事件

- (void)buttonAction:(UIButton *)button {

 

//切换视图控制器

self.selectedIndex = button.tag;

 

//动画

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:.2];

 

_selectedImg.center = button.center;

 

[UIView commitAnimations];

 

}