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一下所有的演示由：AViewController 和 BViewController 完成简写（AVC和BVC）

所有传值合集github链接:https://github.com/TianYou899/valueset

1.属性传值（AVC代码传到BVC代码）:

AVC 导入  BVC

BVC声明属性

//接收值@property (nonatomic, copy) NSString * string;

BViewController * bVC = [[BViewController alloc]init];    bVC.string = self.aTextField.text;    [self.navigationController pushViewController:bVC animated:YES];

2.代理传值（BVC传到AVC）：

BVC：

//定义代理@protocol delegateCZ 
    
     // 代理方法- (void)transferString:(NSString *)string;@end@interface BViewController : UIViewController// 代理属性@property (nonatomic, weak) id
     
       delegate;
     
    

 // 判断有没用遵循代理 有就执行    if (self.delegate && [self.delegate conformsToProtocol:@protocol(delegateCZ)]) {        [self.delegate transferString:self.bTextField.text];    }        [self.navigationController popToRootViewControllerAnimated:YES];

AVC

@interface AViewController ()
   

BViewController * bVC = [[BViewController alloc]init];    // 遵循代理    bVC.delegate = self;

// 从 B 从到A// 执行代理方法- (void)transferString:(NSString *)string {        self.aTextField.text = string;}

3.Block传值（BVC传到AVC）： BVC

// 定义一个blocktypedef void (^blockCZ)(NSString * string);@interface BViewController : UIViewController// block 属性@property (nonatomic,copy) blockCZ  block;

/**          Blcok 传值 B传到A     注意：因为A页面堆过来的时候已经初始化了B 所有不能从A传到B（这种情况下硬传的话 会造成循环引用）     */    _block(self.bTextField.text);    [self.navigationController popToRootViewControllerAnimated:YES];

AVC

BViewController * bVC = [[BViewController alloc]init];    [bVC setBlock:^(NSString * string){        self.aTextField.text = string;    }];        [self.navigationController pushViewController:bVC animated:YES];

4.单例传值（AVC传到BVC）

声明单例类.h

@interface DanLi : NSObject@property (atomic, copy) NSString *value;+ (DanLi *)sharedDanLi;@end

声明单例类.m

#import "DanLi.h"static DanLi *danli = nil;@implementation DanLi//实现方法,判断是否为空,是就创建一个全局实例给它+ (DanLi *)sharedDanLi {        if (danli == nil) {        danli = [[DanLi alloc] init];    }    return danli;}//避免alloc/new创建新的实例变量+ (id)allocWithZone:(struct _NSZone *)zone {        @synchronized(self) {        if (danli == nil) {            danli = [super allocWithZone:zone];        }    }    return danli;}//避免copy,需要实现NSCopying协议- (id)copyWithZone:(NSZone *)zone {    return self;}@end

5.通知传值（BVC传到AVC）

AVC

// 接收通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(tzAction:) name:@"tz" object:nil];

// 回调通知- (void)tzAction:(NSNotification *)sender {        self.aTextField.text = sender.userInfo[@"key"];}

BVC

[[NSNotificationCenter defaultCenter] postNotificationName:@"tz" object:nil userInfo:@{@"key":self.bTextField.text}];        [self.navigationController popToRootViewControllerAnimated:YES];

6.KVC传值（AVC传到BVC）

AVC

BViewController * bVC = [[BViewController alloc]init];        //KVC 传值：这里只能传A传到B （因为 B在A页面提前初始化）    //这里forkey 一定要和B 属性名字一致 （也可以用@"_string"）因为是属性    // 给B属性string  赋值    [bVC setValue:self.aTextField.text forKey:@"string"];        [self.navigationController pushViewController:bVC animated:YES];

BVC

//接收值@property (nonatomic, copy) NSString * string;

// KVC 接收值    self.bTextField.text = self.string;

所有传值合集github链接:https://github.com/TianYou899/valueset

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