iOS常见的传值方式

（一）属性传值

一般用于将第一个界面的值传到第二个界面，不可从第二个界面向第一个界面传值

第一个界面代码：

#import "ViewController.h"

#import "DetailViewController.h"

@interface ViewController ()

@property(nonatomic,strong)UITextField *textNstring;//创建一个属性

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    self.view.backgroundColor = [UIColorbrownColor];

    _textNstring = [[UITextFieldalloc]initWithFrame:CGRectMake(150,100,80, 20)];

    _textNstring.text =@"123456";

    [self.viewaddSubview:self.textNstring];

    //创建一个按钮，应用其点击事件，进行传值和转页

    UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake(50,100,100,20)];

    [button setTitle:@"属性传值"forState:UIControlStateNormal];

    [button addTarget:selfaction:@selector(click)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:button];   

}

//按钮的点击事件

- (void)click{

    DetailViewController *dvc = [[DetailViewControlleralloc]init];

    //属性传值

    dvc.string =self.textNstring.text;

    //跳转页面

    [selfshowViewController:dvcsender:nil];

}

第二个界面代码：

.h文件

#import <UIKit/UIKit.h>

@interface DetailViewController :UIViewController

@property(nonatomic,strong)NSString *string;

@property(nonatomic,strong)UILabel *NSlable;

@end

.m文件

- (void)viewDidLoad {

    [superviewDidLoad];

    self.view.backgroundColor = [UIColoryellowColor];

    _NSlable = [[UILabelalloc]initWithFrame:CGRectMake(100,100,100, 30)];

    _NSlable.textColor = [UIColorblackColor];

    _NSlable.backgroundColor = [UIColorwhiteColor];

    _NSlable.text =_string;

    [self.viewaddSubview:self.NSlable];

}

（二）Block传值

一般用于将第二个界面的值，返回给上一个界面

第一个界面代码：

#import "ViewController.h"

#import "DetailViewController.h"

@interface ViewController ()

@property(nonatomic,strong)UITextField *textNstring;//创建一个属性

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor brownColor];

    _textNstring = [[UITextField alloc]initWithFrame:CGRectMake(150, 100, 80, 20)];

    _textNstring.text = @"123456";

    [self.view addSubview:self.textNstring];

    //创建一个按钮，应用其点击事件，进行传值和转页

    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(50, 100, 100, 20)];

    [button setTitle:@"Block传值" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

    

}

//按钮的点击事件

- (void)click{ 

    DetailViewController *dvc = [[DetailViewController alloc]init];

//Block传值

    __weaktypeof(self) weakSelf =self;

    dvc.block = ^(UILabel *lable){

        weakSelf.textNstring.text = lable.text;

    };

    //跳转页面

    [self.navigationControllerpushViewController:dvcanimated:YES];

}

第二个界面代码：

.h文件

#import <UIKit/UIKit.h>

typedef void (^Block)(UILabel *);

@interface DetailViewController :UIViewController

@property(nonatomic,copy)Block block;

@property(nonatomic,strong)UILabel *NSlable;

@end

.m文件

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor yellowColor];

    _NSlable = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];

    _NSlable.textColor = [UIColor blackColor];

    _NSlable.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:self.NSlable];

    self.NSlable.text = @"789456";

    self.block(_NSlable);

    UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake(100,80,100, 30)];

    button.backgroundColor = [UIColorredColor];

    [button addTarget:self action:@selector(click) 

forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:button];

}

- (void)click{

     [self.navigationControllerpopViewControllerAnimated:YES];//返回上一页

}

（三）代理传值（协议传值）

第一个界面代码：

.h文件

@property(nonatomic,strong)UITextField *textNstring;//创建一个属性

.m文件

#import "ViewController.h"

#import "DetailViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor brownColor];

    _textNstring = [[UITextField alloc]initWithFrame:CGRectMake(150, 100, 80, 20)];

    _textNstring.text = @"123456";

    [self.view addSubview:self.textNstring];

    //创建一个按钮，应用其点击事件，进行传值和转页

    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(50, 100, 100, 20)];

    [button setTitle:@"代理传值" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

    

}

//按钮的点击事件

- (void)click{ 

    DetailViewController *dvc = [[DetailViewController alloc]init];

  dvc.delegate =self;

    //跳转页面

    [self.navigationController pushViewController:dvc animated:YES];

}

第二个界面代码：

.h文件

#import <UIKit/UIKit.h>

@interface DetailViewController : UIViewController

@property(nonatomic,strong)ViewController *delegate;

@property(nonatomic,strong)UILabel *NSlable;

@end

.m文件

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor yellowColor];

    _NSlable = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];

    _NSlable.textColor = [UIColor blackColor];

    _NSlable.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:self.NSlable];

    self.NSlable.text = @"789456";

    self.block(_NSlable);

    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(100, 80, 100, 30)];

    button.backgroundColor = [UIColor redColor];

    [button addTarget:self  action:@selector(click) 

forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

}

- (void)click{

 self.delegate.textNstring.text = self.NSlable.text ;

 [self.navigationController popViewControllerAnimated:YES];//返回上一页

}

（四）单例传值

任何页面都可以调用，贯穿整个应用程序，我用的一个动画效果的单例为例子。

单例界面：

.h文件

#import <UIKit/UIKit.h>

@interface AnimationView: UIView

+ (void)startAnimation;

+ (void)stopAnimation;

@end

.m文件

#import "AnimationView.h"

@interface AnimationView ()

@property(nonnull,nonatomic,strong)UIImageView *imanageView;

@end

@implementation AnimationView

- (instancetype)initWithFrame:(CGRect)frame

{

    self = [superinitWithFrame:frame];

    if (self) {

        [selfsetInterfaceAnimation];

    }

    returnself;

}

- (void)setInterfaceAnimation{

    _imanageView = [[UIImageViewalloc]initWithFrame:CGRectMake(self.bounds.size.width / 2 - 125,self.bounds.size.height /2 - 50,250,80)];

    _imanageView.alpha =0.5;

    [selfaddSubview:_imanageView];

        //图片帧动画

        NSArray * array =@[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16"];//图片名

        NSMutableArray *imanges = [NSMutableArrayarray];

        for (NSString *namein array ) {

            [imanges addObject:[UIImageimageNamed:name]];//分别添加每一个名字对应的image

        }

        _imanageView.animationImages = imanges;//放入多张图片

        _imanageView.animationDuration =1;//转化延迟时间

        _imanageView.animationRepeatCount = -1;//不结束

    [[UIApplicationsharedApplication].keyWindowaddSubview:self.imanageView];

}

+ (void)startAnimation{

    [_imanageViewstartAnimating];

    

}

+ (void)stopAnimation{

    [_imanageViewstopAnimating];

    [_imanageViewremoveFromSuperview];

}

调用单例的类：

先导入：

#import "AnimationView.h"

声明属性：

@property(nonatomic,strong)AnimationView *AnimationVC;

//离开界面的时候调用单例中的stopAnimation方法

- (void)viewDidDisappear:(BOOL)animated{

    [_AnimationVCstopAnimation];

}

//载入时调用单例中的startAnimation方法

- (void)viewDidLoad {

    [superviewDidLoad];

    self.AnimationVC = [[AnimationViewalloc]initWithFrame:self.view.bounds];

    [self.AnimationVCstartAnimation];

}

（五）通知传值

一般用在多界面传值。通知传值的四大步骤：注册-发送-处理-移除

第一个界面代码：

#import "ViewController.h"

#import "DetailViewController.h"

@interface ViewController ()

@property(nonatomic,strong)UITextField *textNstring;//创建一个属性

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor brownColor];

    _textNstring = [[UITextField alloc]initWithFrame:CGRectMake(150, 100, 80, 20)];

    _textNstring.text = @"123456";

    [self.view addSubview:self.textNstring];

    //创建一个按钮，应用其点击事件，进行传值和转页

    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(50, 100, 100, 20)];

    [button setTitle:@"通知传值" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

    

}

//按钮的点击事件

- (void)click{ 

//注册通知

    [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(action_Notification:)name:@"DailiyRecommendNoti"object:nil];

    DetailViewController *dvc = [[DetailViewController alloc]init];

    //跳转页面

    [self.navigationControllerpushViewController:dvc animated:YES];

}

//通知传值，获得值

- (void)action_Notification:(NSNotification *)sender{

    _textNstring.text = sender.object;

}

//释放通知

- (void)dealloc{

    [[NSNotificationCenterdefaultCenter ]removeObserver:self];

}

第二个界面代码：

.h文件

#import <UIKit/UIKit.h>

@interface DetailViewController :UIViewController

@property(nonatomic,strong)UILabel *NSlable;

@end

.m文件

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor yellowColor];

    _NSlable = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];

    _NSlable.textColor = [UIColor blackColor];

    _NSlable.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:self.NSlable];

    self.NSlable.text = @"789456";

    UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake(100,80, 100, 30)];

    button.backgroundColor = [UIColorredColor];

    [button addTarget:self action:@selector(click) 

forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:button];

}

- (void)click{

 [[NSNotificationCenterdefaultCenter] postNotificationName:@"DailiyRecommendNoti"object:_NSlable.text];

     [self.navigationControllerpopViewControllerAnimated:YES];//返回上一页

}

（六）方法传值

第一个界面代码：

#import "ViewController.h"

#import "DetailViewController.h"

@interface ViewController ()

@property(nonatomic,strong)UITextField *textNstring;//创建一个属性

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    self.view.backgroundColor = [UIColorbrownColor];

    _textNstring = [[UITextFieldalloc]initWithFrame:CGRectMake(150,100, 80, 20)];

    _textNstring.text =@"123456";

    [self.viewaddSubview:self.textNstring];

    //创建一个按钮，应用其点击事件，进行传值和转页

    UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake(50,100, 100,20)];

    [button setTitle:@"方法传值"forState:UIControlStateNormal];

    [button addTarget:selfaction:@selector(click)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:button];   

}

//按钮的点击事件

- (void)click{

   DetailViewController *dvc = [[DetailViewControlleralloc]initWithString:_textNstring.text];

    //跳转页面

    [selfshowViewController:dvc sender:nil];

}

第二个界面代码：

.h文件

#import <UIKit/UIKit.h>

@interface DetailViewController :UIViewController

- (instancetype)initWithString:(NSString *)string;

@property(nonatomic,strong)UILabel *NSlable;

@end

.m文件

- (instancetype)initWithString:(NSString *)string{

    self = [superinit];

    if (self) {

        _NSlable = [[UILabelalloc]initWithFrame:CGRectMake(100,100, 100, 30)];

        _NSlable.textColor = [UIColorblackColor];

        _NSlable.backgroundColor = [UIColorwhiteColor];

        [self.viewaddSubview:self.NSlable];

        _NSlable.text = string;

    }

    returnself;

}

- (void)viewDidLoad {

    [superviewDidLoad];

    self.view.backgroundColor = [UIColoryellowColor];

}