三級控制器的概念：UITabBarController- ->(管理) UINavigationController -->(管理) UIViewController

下面筆者就分享一下三級控制器的使用

#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 {

 

//創建三級控制器

[self _creatView];

 

//自定義標簽工具欄

[self _newInitTabbar];

 

 

}

//創建三級控制器

- (void)_creatView{

 

 

//1.創建視圖控制器並把視圖控制器添加到數組中

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];

//將視圖控制器存放到數組中

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

 

//2.創建導航控制器並把視圖控制器交給導航控制器管理，並且把導航控制器也添加到連一個數組中

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

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

 

//取得視圖控制器

UIViewController *viewCtrl = viewCtrls[i];

 

//創建導航控制器

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

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

[navCtrls addObject:navCtrl];

 

}

 

//3.創建標簽控制器，並把導航控制器交給標簽控制器管理

self.viewControllers = navCtrls;

}

//自定義標簽工具欄

 

- (void)_newInitTabbar {

 

//(1)移除工具欄上的按鈕

//取得tabbar上的所有子視圖

NSArray *views = [self.tabBar subviews];

for (UIView *view in views) {

[view removeFromSuperview];

}

 

//(2)設置背景

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

 

//(3)創建按鈕

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

//每一個按鈕的寬度

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];

//設置frame

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

//添加一個點擊事件

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

[self.tabBar addSubview:button];

}

 

//(4)創建選中圖片

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

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

[self.tabBar addSubview:_selectedImg];

 

}

 

//按鈕的點擊事件

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

 

//切換視圖控制器

self.selectedIndex = button.tag;

 

//動畫

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:.2];

 

_selectedImg.center = button.center;

 

[UIView commitAnimations];

 

}