UI基础整理-13

来源：互联网发布：mac如何切换全角半角编辑：程序博客网时间：2024/06/03 20:32

block&单例&tabBarController

block

声明 :

.h中

typedef void (^Block)(NSString *string);

@interface CustomViewController : UIViewController

//在MRC下使用copy,将passValueBlock从栈区拷贝到堆区

//在ARC下使用strong完成拷贝

@property (nonatomic ,strong)Block passValueBlock;

//strong自带拷贝的功能将block写成属性

@end

调用 :

.m中

self.passValueBlock(self.textField.text);

实现 :

收值得界面

//调用block时的代码实现

customVC.passValueBlock = ^(NSString *string){

self.label.text = string;

};

单例(不完整单例)

使用类方法创建

在页面中使用方法创建对象的时候,会走写的类方法(判断是否存在,如果存在就是用原先的,如果不存在,就创建一个新的)

//只能使用一次,其他的方法也能识别

//放入静态区

static SHSingleton *singleton = nil;

+ (instancetype)shareSingleton{

//唯一的

if(nil == singleton){

singleton = [[SHSingleton alloc]init];

}

return singleton;

}

tabBarController

// AppDelegate.m

// Lesson13_tabBarController

// Created by Floating_SH on 15/12/3.

#import "AppDelegate.h"

@interface AppDelegate ()<UITabBarControllerDelegate>

@property (nonatomic ,strong)UITabBarController *tabBC;

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindowalloc]initWithFrame:[UIScreenmainScreen].bounds];

[self.windowsetBackgroundColor:[UIColorwhiteColor]];

[self.windowmakeKeyAndVisible];

//创建子控制器

FirstViewController *firstVC = [[FirstViewControlleralloc]init];

UINavigationController *firstNC = [[UINavigationControlleralloc]initWithRootViewController:firstVC];

SecondViewController *secondVC = [[SecondViewControlleralloc]init];

UINavigationController *secondNC = [[UINavigationControlleralloc]initWithRootViewController:secondVC];

ThirdViewController *thirdVC = [[ThirdViewControlleralloc]init];

UINavigationController *thirdNC = [[UINavigationControlleralloc]initWithRootViewController:thirdVC];

ForthViewController *forthVC = [[ForthViewControlleralloc]init];

UINavigationController *forthNC = [[UINavigationControlleralloc]initWithRootViewController:forthVC];

FifthViewController *fifthVC = [[FifthViewControlleralloc]init];

UINavigationController *fifthNC = [[UINavigationControlleralloc]initWithRootViewController:fifthVC];

//创建标签视图控制器

self.tabBC = [[UITabBarControlleralloc]init];

//设置子控制器

self.tabBC.viewControllers =@[firstNC,secondNC,thirdNC,forthNC,fifthNC];

//设置title

// firstVC.title = @"第一页";

// secondVC.title = @"第二页";

// thirdVC.title = @"第三页";

// forthVC.title = @"第四页";

// fifthVC.title = @"第五页";

// sixthVC.title = @"第六页";

// seventVC.title = @"第七页";

//设置默认选中下标

self.tabBC.selectedIndex =3;

//代理

self.tabBC.delegate =self;

//badgeValue

firstVC.tabBarItem.badgeValue =@"99+";

//tabBar默认高度是49

//tarBar选中时字体的颜色

self.tabBC.tabBar.tintColor = [UIColororangeColor];

//tabBar颜色

// self.tabBC.tabBar.barTintColor = [UIColor redColor];

//tarBar样式(慎用)

// self.tabBC.tabBar.barStyle = UIBarStyleBlackOpaque;

//设置背景图片

// self.tabBC.tabBar.backgroundImage = [UIImage imageNamed:@"1"];

// UIImage *image = [UIImage imageNamed:@"1"];

// image = [image imageWithAlignmentRectInsets:(UIEdgeInsetsMake(0, 20, 20, 20))];

// self.tabBC.tabBar.backgroundImage = image;

//设置为window的根视图控制器

self.window.rootViewController =self.tabBC;

return YES;

}

#pragma mark -------------tabBarControllerDelegate------------

//已经选中某一个视图控制器 :通常情况下进行视图的设置

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{

//子类指针无法指向父类对象,使用强转

//viewController: 我们选中的控制器

if (tabBarController.selectedIndex ==1) {

SecondViewController *secondVC = (SecondViewController *)viewController;

}

//点第一个页面的时候,让99+消失

if(tabBarController.selectedIndex ==0){

FirstViewController *firstVC = (FirstViewController *)viewController;

firstVC.tabBarItem.badgeValue =nil;

}

NSLog(@"%s",__FUNCTION__);

}

//将要选中某一个视图控制器 :通常情况下进行数据的准备

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{

NSLog(@"%s",__FUNCTION__);

return YES;

}

0 0