ios界面传值2016.5

五种方法

1.属性传值，适合界面A到界面B的传值
2.单例， 多个界面传值
3.通知 ， 界面A跳转到界面C，C再跳回界面A的传值
4.使用代理， 界面A跳转到界面C，C再跳回界面A的传值
5.block

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1.属性传值

新建工程，添加SecondViewController类，
在.h文件中，定义属性

@interface SecondViewController : UIViewController
@property (nonatomic, copy) NSString *name;
@end

在.m文件中

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.navigationItem.title = @"第二页";
    UILabel *lb = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    lb.text = self.name;
    [self.view addSubview:lb];
    
}

在ViewController.m文件中（使用导航控制器）

- (void)viewDidLoad {
    [super viewDidLoad];
    //设置导航控制器的标题
    self.view.backgroundColor = [UIColor cyanColor];
    self.navigationItem.title = @"主页";
    UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 80, 20)];
    [btn1 setTitle:@"属性传值" forState:UIControlStateNormal];
    [btn1 addTarget:self action:@selector(nextVc) forControlEvents:UIControlEventTouchUpInside];
    [btn1 setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:btn1];
    
}

按钮事件中编写代码

- (void)nextVc {
    SecondViewController *vc = [[SecondViewController alloc]init];
    vc.name =@"admin";
    [self.navigationController pushViewController:vc animated:YES];
}

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2.单例传值

理解为定义一个全局静态变量进行传值。
创建一个单例类，继承NSObject，命名为Session
Session.h文件中定义一个属性用来存储值,定义一个方法

@interface Session : NSObject
@property (nonatomic, copy) NSString *name;
+(instancetype)sharedName;
@end

Session.m文件实现

static Session *sessionHandle = nil;
@implementation Session
+(instancetype)sharedName{
    if (sessionHandle == nil) {
        sessionHandle = [[Session alloc]init];
    }
    return sessionHandle;
}

在ViewController.m文件中

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //设置导航控制器的标题  
    self.view.backgroundColor = [UIColor cyanColor];
    self.navigationItem.title = @"主页";
 
    UIButton *btn2 = [[UIButton alloc]initWithFrame:CGRectMake(100, 150, 80, 20)];
    [btn2 setTitle:@"单例传值" forState:UIControlStateNormal];
    [btn2 addTarget:self action:@selector(nextVc2) forControlEvents:UIControlEventTouchUpInside];
    [btn2 setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:btn2];
    
    
}

在按钮事件中

- (void)nextVc2 {
    ThirdViewController *vc = [[ThirdViewController alloc]init];
    
    Session *s = [Session sharedName];
    s.name = @"管理员";
    [self.navigationController pushViewController:vc animated:YES];
}

添加ThirdViewController类，在.m文件中实现

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.navigationItem.title = @"单例传值";
    UILabel *lb = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 70, 20)];
    
    Session *s = [Session sharedName];
    lb.text = s.name;
    
    [lb setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:lb];
    
}

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3.使用通知传值

以上是界面A传值到界面B，现在来实现界面A跳到界面C，界面C用通知传值给界面A。
添加FourthViewController类
在ViewController.m文件中

- (void)viewDidLoad {
    [super viewDidLoad];
    //设置导航控制器的标题
    self.view.backgroundColor = [UIColor cyanColor];
    self.navigationItem.title = @"主页";

   UIButton *btn3 = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 80, 20)];
    [btn3 setTitle:@"通知传值" forState:UIControlStateNormal];
    [btn3 addTarget:self action:@selector(nextVc3) forControlEvents:UIControlEventTouchUpInside];
    [btn3 setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:btn3];

//注册通知
    //可以理解为创建一个收音机，调到FM电台，等待接收广播信息
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(listen：) name:@"FM" object:nil];
    
}

在监听事件

-(void)listen:(NSNotification *)sender{
    NSLog(@"您正在收听的是：%@",sender.userInfo[@"music"]);
}

按钮跳转事件

- (void)nextVc3 {
    FourthViewController *vc = [[FourthViewController alloc]init];
    
    [self.navigationController pushViewController:vc animated:YES];
}

FourthViewController.m文件中实现

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.navigationItem.title = @"通知传值";
    UIButton *play = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 70, 20)];
   
    [play setBackgroundColor:[UIColor blueColor]];
    [play addTarget:self action:@selector(sendMusic) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:play];
}

-(void)sendMusic{
    NSDictionary *dict = [NSDictionary dictionaryWithObject:@"精忠报国" forKey:@"music"];
    
    [[NSNotificationCenter defaultCenter] postNotificationName:@"FM" object:nil userInfo:dict];
    
    [self.navigationController popToRootViewControllerAnimated:YES];
}
 

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4.使用代理传值

新建FivethViewController类，
FivethViewController.h定义

//1定义代理协议
@protocol FivethViewControllerDelegate 
@optional
-(void)passValue:(NSString *)str;
@end
@interface FivethViewController : UIViewController
//2定义代理属性
@property (nonatomic, weak)id  delegate;
@end

FivethViewController.m实现

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.navigationItem.title = @"代理传值";
    UIButton *play = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 70, 20)];
    
    [play setBackgroundColor:[UIColor blueColor]];
    [play addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:play];
}

-(void)test{
    if ([self.delegate respondsToSelector:@selector(passValue:)]) {
        [self.delegate passValue:@"代理传值成功"];
    }
    [self.navigationController popToRootViewControllerAnimated:YES];
}

源控制器ViewController.h文件中遵守代理协议

@interface ViewController ()

源控制器ViewController.m文件中

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //设置导航控制器的标题
    
    self.view.backgroundColor = [UIColor cyanColor];
    self.navigationItem.title = @"主页";

    UIButton *btn4 = [[UIButton alloc]initWithFrame:CGRectMake(100, 250, 80, 20)];
    [btn4 setTitle:@"代理传值" forState:UIControlStateNormal];
    [btn4 addTarget:self action:@selector(nextVc4) forControlEvents:UIControlEventTouchUpInside];
    [btn4 setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:btn4];   
}
- (void)nextVc4 {
   FivethViewController *vc = [[FivethViewController alloc]init];
    vc.delegate = self;
    [self.navigationController pushViewController:vc animated:YES];
}

#pragma mark 实现代理方法
-(void)passValue:(NSString *)str{
    NSLog(@"%@",str);
}

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5.block传值

新建SixthViewController类，
SixthViewController.h定义

typedef void (^blockFunType)(NSString *);
@interface SixthViewController : UIViewController
@property (nonatomic, copy) blockFunType blockFun;

SixthViewController.m文件实现

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.navigationItem.title = @"block传值";
    UIButton *play = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 70, 20)];
    
    [play setBackgroundColor:[UIColor blueColor]];
    [play addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:play];
}

- (void)back{
    self.blockFun(@"block传值");
    [self.navigationController popViewControllerAnimated:YES];
}

源控制器ViewController界面拖进一个label
源控制器ViewController.h文件中

@property (weak, nonatomic) IBOutlet UILabel *label;

源控制器ViewController.m文件中

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //设置导航控制器的标题    
    self.view.backgroundColor = [UIColor cyanColor];
    self.navigationItem.title = @"主页";

     UIButton *btn5 = [[UIButton alloc]initWithFrame:CGRectMake(100, 300, 80, 20)];
    [btn5 setTitle:@"block传值" forState:UIControlStateNormal];
    [btn5 addTarget:self action:@selector(nextVc5) forControlEvents:UIControlEventTouchUpInside];
    [btn5 setBackgroundColor:[UIColor blueColor]];
    [self.view addSubview:btn5];
}
- (void)nextVc5 {
    SixthViewController *vc = [[SixthViewController alloc]init];
    __block typeof (self)tempSelf = self;
    vc.blockFun = ^(NSString *string){
        tempSelf.label.text = string;
        NSLog(@"%@",string);
    };
    [self.navigationController pushViewController:vc animated:YES];
}

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