Objective-C-「传值总结」

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###一、属性传值

A界面->B界面传值

B_界面.h文件(接收者)

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        //////////B界面.h//////////

//1.声明属性
@property (nonatomic, copy) NSString *bString;

A_界面.m文件(发送者)

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        //////////A界面.m//////////

//2.属性传值
    BViewController *bVC = [BViewController new];
    bVC.bString = @"A";
    [self.navigationController pushViewController:bVC animated:YES];

B_界面.m文件(接收者)

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        //////////B界面.m//////////

//3.结果
    NSLog(@"A界面→B界面:%@", self.bString);
    //输出:   A界面→B界面:A

###二、方法传值

A界面->B界面传值

B_界面.m文件(接收者)

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        //////////B界面.m//////////

//1.自定义初始化方法
- (instancetype)initWithOne:(NSString *)one Two:(CGFloat)two{
   self = [super init];
    if (self) {
//4.结果
        NSLog(@"A界面→B界面:%@ %.2f", one, two);
        //输出: A界面→B界面:A 99.90
    }
    return self;
}

B_界面.h文件(接收者)

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        //////////B界面.h//////////

//2.声明初始化方法
- (instancetype)initWithOne:(NSString *)one Two:(CGFloat)two;

A_界面.m文件(发送者)

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        //////////A界面.m//////////

//3.方法传值
    BViewController *bVC = [[BViewController alloc] initWithOne:@"A" Two:99.9];
    [self.navigationController pushViewController:bVC animated:YES];

###三、代理传值

B界面->A界面传值

B_界面.h文件(发送者)

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        //////////B界面.h//////////

#import <UIKit/UIKit.h>
//1.声明协议和代理方法
@protocol BViewControllerDelegate <NSObject>
- (void)protocolSendValue:(NSString *)value;
@end

@interface BViewController : UIViewController
//2.设置代理(ARC用weak,MRC用assign)
@property (nonatomic, weak) id <BViewControllerDelegate> myDelegate;
@end

B_界面.m文件(发送者)

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        //////////B界面.m//////////

//3.让代理执行代理方法(代理传值)
    [self.myDelegate protocolSendValue:@"B"];

A_界面.m文件(接收者)

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        //////////A界面.m//////////

//4.签订代理协议
@interface AViewController ()<BViewControllerDelegate>
@end
  
- (void)viewDidLoad {
    [super viewDidLoad];
//5.指定代理
    BViewController *bVC = [BViewController new];
    bVC.myDelegate = self;
    [self.navigationController pushViewController:bVC animated:YES];
}

#pragma mark -BViewControllerDelegate
//6.实现代理方法(结果)
- (void)protocolSendValue:(NSString *)value{
    NSLog(@"B界面→A界面:%@", value);
    //输出: B界面→A界面:B
}

####

###四、Block传值

B界面->A界面传值
注:Block中要防止在文件中循环引用

B_界面.h文件(发送者)

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        //////////B界面.h//////////

//1.声明Block属性
typedef void(^ValueBlock)(NSString *);

@interface BViewController : UIViewController
@property (nonatomic, copy) ValueBlock valueBlock;
@end

B_界面.m文件(发送者)

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        //////////B界面.m//////////

//2.Block传值(代码块属性不为空)
    if (self.valueBlock) {
        self.valueBlock(@"B");
    }

A_界面.m文件(接收者)

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        //////////A界面.m//////////

    BViewController *bVC = [BViewController new];
    [self.navigationController pushViewController:bVC animated:YES];
//3.结果(Block中要防止在文件中循环引用)
 //__weak typeof(self) weakSelf = self;
    bVC.valueBlock = ^(NSString *string){
        NSLog(@"B界面→A界面:%@", string);
  //输出: B界面→A界面:B
    };

###五、通知中心传值

任意界面->A界面
注:发送者和接收者name参数必须保持一致

A_界面.m文件(接收者)

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        //////////A界面.m//////////

//1.注册通知
- (void)viewDidLoad {
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(acceptNotification:) name:@"noticeSendValue" object:nil];
    CViewController *cVC = [CViewController new];
    [self.navigationController pushViewController:cVC animated:YES];
}

//2.销毁通知
- (void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"noticeSendValue" object:nil];
}

//4.结果
- (void)acceptNotification:(NSNotification*)notification{
    NSLog(@"%@",  notification.userInfo);
    //输出:   {name = text;}
}

C_界面.m(发送者)

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        //////////C界面.m//////////

//3.通知传值
    [[NSNotificationCenter defaultCenter] postNotificationName:@"noticeSendValue" object:self userInfo:@{@"name": @"text"}];

###六、单例传值

A界面->任意界面
使用单例模式,编写ValueManager单例类来存储数据

ValueManager.h文件(全局唯一)

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      //////////单例.h//////////

@interface ValueManager : NSObject
+ (ValueManager *)shareValueManager;
@property (nonatomic, copy) NSString *strValue;
@end

ValueManager.m文件(全局唯一)

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      //////////单例.m//////////

+ (ValueManager *)shareValueManager{
    static ValueManager *shareValueManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        shareValueManager = [ValueManager new];
    });
    return shareValueManager;
}

A_界面.m文件(发送者)

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      //////////A界面.m//////////

//2.单例传值(存值)
    ValueManager *valueManager = [ValueManager shareValueManager];
    valueManager.strValue = @"Singleton";

C_界面.m文件(接收者)

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      //////////C界面.m//////////  

//3.结果(取值)
    ValueManager *valueManager = [ValueManager shareValueManager];
    NSLog(@"%@", valueManager.strValue);
   //输出: Singleton

###七、NSuserDefault传值

A界面->任意界面

A_界面.m文件(发送者)

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      //////////A界面.m//////////

//1.NSuserDefault传值(存值)
    [[NSUserDefaults standardUserDefaults] setObject:@"NSUserDefaults" forKey:@"name"];
    [[NSUserDefaults standardUserDefaults] synchronize];

C_界面.m文件(接收者)

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      //////////C界面.m//////////

//2.取值
    NSLog(@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@"name"]);
    //输出:   NSUserDefaults