iOS学习(UI)知识点整理
一、自定义标签栏
1）方法一 单个创建标签栏
1 #import "AppDelegate.h"
2 #import "SecondViewController.h"
3 #import "ViewController.h"
4 #import "ThirdViewController.h"
5 #import "ForthViewController.h"
6 #import "ViewController1.h"
7 #import "ViewController2.h"
8 #import "ViewController3.h"
9 #import "ViewController4.h"
10 @interface AppDelegate ()<UITabBarControllerDelegate>
11 @end
12
13 @implementation AppDelegate
14 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
15 //1.直接设置默认的标签的属性
16 UINavigationController *navi1 = [[UINavigationController alloc]initWithRootViewController:[ViewController new]];
17 //设置navi1所对应的界面的标签的标题
18 navi1.tabBarItem.title = @"home";
19 //设置navi1所对应的标签的图标
20 navi1.tabBarItem.image = [[UIImage imageNamed:@"tabbar_account_press"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
21 //2.直接创建一个新的标签
22 UIViewController *vc1 = [ViewController1 new];
23 //创建的方式里面包含三个参数:文字标题,普通状态下的图片,选中状态下的图片
24 UITabBarItem *item = [[UITabBarItem alloc]initWithTitle:@"界面二" image:[UIImage imageNamed:@"tabbar_appfree"] selectedImage:[UIImage imageNamed:@"tabbar_account"]];
25 vc1.tabBarItem = item;
26 //设置数字徽标,用来提示用户
27 item.badgeValue = @"20";
28 //设置系统图标右上角的数字
29 [[UIApplication sharedApplication] setApplicationIconBadgeNumber:55];
30
31
32 //3.创建标签的另一种方式
33 UINavigationController *navi2 = [[UINavigationController alloc]initWithRootViewController:[ViewController2 new]];
34 //参数:标题和图片
35 UITabBarItem *item2 = [[UITabBarItem alloc]initWithTitle:@"界面三" image:[UIImage imageNamed:@"tabbar_reduceprice"] tag:100];
36 item2.selectedImage = [UIImage imageNamed:@"tabbar_subject"];
37 navi2.tabBarItem = item2;
38
39
40 //4.他们系统样式的标签
41 UINavigationController *navi3 = [[UINavigationController alloc]initWithRootViewController:[ViewController3 new]];
42 //使用系统的样式创建标签,图片和文字都无法修改
43 navi3.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemDownloads tag:200];
44 //无法修改
45 navi3.tabBarItem.title = @"界面四";
46 UINavigationController *navi4 = [[UINavigationController alloc]initWithRootViewController:[ViewController4 new]];
47 navi4.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFeatured tag:101];
48
49 //如果创建的标签数量大于5个,则从第5个开始(包括第5个)都会被放到More标签中
50 UINavigationController *navi5 = [[UINavigationController alloc]initWithRootViewController:[SecondViewController new]];
51 navi5.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemHistory tag:101];
52
53 //创建标签栏控制器
54 UITabBarController *tabbar = [[UITabBarController alloc]init];
55 //设置标签栏控制器所管理的视图控制器
56 tabbar.viewControllers = @[navi1,vc1,navi2,navi3,navi4,navi5];
57 NSInteger index = [[[NSUserDefaults standardUserDefaults]valueForKey:@"selectedindex"] integerValue];
58 //设置tabbar选中的标签
59 tabbar.selectedIndex = index;
60 tabbar.delegate = self;
61 self.window.rootViewController = tabbar;
62 self.window.backgroundColor = [UIColor whiteColor];
63 return YES;
64 }
65
66 //选中某一个视图控制器的时候,调用该方法
67 - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
68 {
69 [[NSUserDefaults standardUserDefaults]setValue:@(tabBarController.selectedIndex) forKey:@"selectedindex"];
70 [[NSUserDefaults standardUserDefaults]synchronize];
71 NSLog(@"%@",viewController);
72 }
73
74 //自定义视图控制器完成的时候调用
75 - (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed
76 {
77 NSLog(@"%@",viewControllers);
78 }
79 @end
2）方法二 循环遍历创建标签栏
1）创建一个继承自UIButton的类 MyTabbBarItem 用于创建标签栏的按钮
MyTabbBarItem.h 文件中的代码实现
1 #import <UIKit/UIKit.h> 2 @interface MyTabbBarItem : UIButton 3 @end
2） MyTabbBarItem.m 文件中的代码实现
1 #import "MyTabbBarItem.h"
2 @implementation MyTabbBarItem
3 - (instancetype)initWithFrame:(CGRect)frame
4 {
5 self = [super initWithFrame:frame];
6 if (self) {
7 self.titleLabel.font = [UIFont systemFontOfSize:12];
8 self.titleLabel.textAlignment = NSTextAlignmentCenter;
9 [self setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
10 [self setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
11 }
12 return self;
13 }
14
15 //这个方法返回的cgrect是按钮上的title部分的位置和大小
16 - (CGRect)titleRectForContentRect:(CGRect)contentRect
17 {
18 return CGRectMake(0, 30, contentRect.size.width, 15);
19 }
20
21 - (CGRect)imageRectForContentRect:(CGRect)contentRect
22 {
23 return CGRectMake((contentRect.size.width - 26)/2, 2, 26, 26);
24 }
3）自定义标签栏的类 MyTabBarController.h 代码实现
1 #import <UIKit/UIKit.h> 2 @interface MyTabBarController : UITabBarController 3 4 @end
4）自定义标签栏的类 MyTabBarController.m 代码实现
1 #import "MyTabBarController.h"
2 #import "ViewController.h"
3 #import "ViewController1.h"
4 #import "ViewController2.h"
5 #import "ViewController3.h"
6 #import "ViewController4.h"
7 #import "MyTabbBarItem.h"
8
9 @interface MyTabBarController ()
10 {
11 UIImageView *_myTabbar;
12 }
13 @end
14
15 @implementation MyTabBarController
16
17 - (void)viewDidLoad {
18 [super viewDidLoad];
19
20 //配置标签栏控制器
21 //自定义标签栏的步骤
22
23 //1.隐藏系统的标签栏
24 self.tabBar.hidden = YES;
25
26 //3.创建所有的视图控制器
27 [self createViewControllers];
28
29 //2.创建一个新标签栏
30 [self createTabbar];
31
32 //4.创建所有标签
33 [self createTabs];
34
35 //5.标签和视图控制器进行关联
36
37 }
38
39 -(void)createTabbar
40 {
41 CGRect frame = [[UIScreen mainScreen]bounds];
42 frame.origin.y = frame.size.height - 49;
43 frame.size.height = 49;
44
45 _myTabbar = [[UIImageView alloc]initWithFrame:self.tabBar.bounds];
46
47 _myTabbar.backgroundColor = [UIColor blueColor];
48
49 //将自定义标签栏添加在系统标签栏上
50 [self.tabBar addSubview:_myTabbar];
51 _myTabbar.userInteractionEnabled = YES;
}
54 -(void)createViewControllers
56 {
57 NSArray *vcArray = @[@"ViewController",
58 @"ViewController1",
59 @"ViewController2",
60 @"ViewController3",
61 @"ViewController4"];
62
63 NSMutableArray *vcs = [[NSMutableArray alloc]init];
64 for (int i = 0; i<vcArray.count; i++) {
65 //反射(将字符串对象转换成对应的类对象)
66 UIViewController *vc = [[NSClassFromString(vcArray[i]) alloc]init];
67 vc.navigationItem.title = vcArray[i];
68 UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:vc];
69 [vcs addObject:navi];
70 }
71 self.viewControllers = vcs;
72 }
73
74 -(void)createTabs
75 {
76 NSArray *titleArray = @[@"首页",@"社会",@"金融",@"法制",@"教育"];
77 NSArray *imageArray = @[@"tabbar_account",
78 @"tabbar_appfree",
79 @"tabbar_limitfree",
80 @"tabbar_reduceprice",
81 @"tabbar_subject"];
82 NSArray *imageSelectedArray = @[@"tabbar_account_press",
83 @"tabbar_appfree_press",
84 @"tabbar_limitfree_press",
85 @"tabbar_reduceprice_press",
86 @"tabbar_subject_press"];
87
88
89 for (int i = 0; i<titleArray.count; i++) {
90 MyTabbBarItem *btn = [MyTabbBarItem buttonWithType:UIButtonTypeCustom];
91 [btn setTitle:titleArray[i] forState:UIControlStateNormal];
92 [btn setImage:[UIImage imageNamed:imageArray[i]] forState:UIControlStateNormal];
93 [btn setImage:[UIImage imageNamed:imageSelectedArray[i]] forState:UIControlStateSelected];
94 if (i == 0) {
95 btn.selected = YES;
96 }
97 CGFloat width = [[UIScreen mainScreen]bounds].size.width/5;
98 btn.frame = CGRectMake(width * i, 0, width, 49);
99 [_myTabbar addSubview:btn];
100 btn.tag = 100 + i;
101 [btn addTarget:self action:@selector(selectAction:) forControlEvents:UIControlEventTouchUpInside];
103 }
105 }
106
107 -(void)selectAction:(UIButton *)btn
108 {
109 NSInteger index = btn.tag - 100;
110 self.selectedIndex = index;
112 for (UIButton *btn in _myTabbar.subviews) {
113 btn.selected = NO;
114 }
116 //设置selected属性
117 btn.selected = YES;
118 }
119
120 @end
5）AppDelegate.m 文件中的代码实现
1 //系统自带的标签的高度是49 2 //可以自定义标签来设置不同高度的标签栏 3 //此处不能指定导航栏否则标签栏无法显示，因为后面会指定导航栏 4 MyTabBarController *tabbar = [[MyTabBarController alloc]init]; 5 self.window.rootViewController = tabbar; 6 self.window.backgroundColor = [UIColor whiteColor]; 7 return YES;
时间： 2024-10-09 15:49:56