iOS 传值

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通知传值

- (void)viewDidLoad {    [super viewDidLoad];    // 注册监听者    // name 的值要和发送通知页面的name值相同，用来区分哪一个通知    // object 的值为nil时，代表监听任何对象发送的通知，下文中用的是object：obj1    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeValue:) name:@"changeValue" object:nil];}- (void)changeValue:(NSNotification *)notifi{    // 可以传多值    if ([notifi.object isEqualToString:@"obj1"]) {        NSString *str = [NSString stringWithFormat:@"%@--%@",[[notifi userInfo] objectForKey:@"value1"],[[notifi userInfo] objectForKey:@"value2"]];        _lbValue.text = str;    }else {        _lbValue.text = @"aaaaaa";    }}// 按钮点击事件- (IBAction)nextAction:(UIButton *)sender{    NextViewController *nextController = [[NextViewController alloc] init];    [self presentViewController:nextController animated:YES completion:nil];}

- (void)viewDidLoad {    [super viewDidLoad];}// 按钮点击事件- (IBAction)finishAction:(UIButton *)sender{    // 发送通知    // userInfo 为附加属性，为字典类型    [[NSNotificationCenter defaultCenter] postNotificationName:@"changeValue" object:@"obj1" userInfo:@{@"value1":_tfText.text,@"value2":@"111111"}];    [self dismissViewControllerAnimated:YES completion:nil];}

代理传值

@interface ViewController () <ChangeValueDelegte>@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    }- (IBAction)nextAction:(id)sender{    NextViewController *nextController = [[NextViewController alloc] init];    // 遵守协议    nextController.delegate = self;    [self presentViewController:nextController animated:YES completion:nil];}// 实现协议中的方法- (void)shoudChangeValue:(NSString *)paraStr{    _lbValue.text = paraStr;}

#import <UIKit/UIKit.h>// 声明一个协议@protocol ChangeValueDelegte <NSObject>- (void)shoudChangeValue:(NSString *)paraStr;@end@interface NextViewController : UIViewController@property (nonatomic,weak) IBOutlet UITextField *tfValue;// 注意delegate用weak修饰,为防止循环引用@property (nonatomic,weak) id<ChangeValueDelegte> delegate;@end- (void)viewDidLoad {    [super viewDidLoad];}- (IBAction)finishAction:(id)sender{    // 让代理传值    [_delegate shoudChangeValue:_tfValue.text];    [self dismissViewControllerAnimated:YES completion:nil];}

block传值

- (void)viewDidLoad {    [super viewDidLoad];}- (IBAction)nextAction:(id)sender{    NextViewController *nextController = [[NextViewController alloc] init];    // 实现block    [nextController setChangeValue:^(NSString *param){        _lbValue.text = param;    }];    [self presentViewController:nextController animated:YES completion:nil];}

#import <UIKit/UIKit.h>// 声明一个blocktypedef  void(^ShoudChangeValue)(NSString *paraStr);@interface NextViewController : UIViewController@property (nonatomic,weak) IBOutlet UITextField *tfValue;// block 用copy修饰@property (nonatomic,copy) ShoudChangeValue changeValue;@end- (void)viewDidLoad {    [super viewDidLoad];}- (IBAction)finishAction:(id)sender{    // 调用block传值    _changeValue(_tfValue.text);    [self dismissViewControllerAnimated:YES completion:nil];}