ios 给网页传值_IOS 界面之间传值总结

iOS页面间传值的方式(NSUserDefault/Delegate/NSNotification/Block/单例)

实现了以下iOS页面间传值：1.委托delegate方式；2.通知notification方式；3.block方式；4.UserDefault或者文件方式；5.单例模式方式；6.通过设置属性，实现页面间传值

在iOS开发中，我们经常会遇到页面间跳转传值的问题，现归纳总结一下：

情况1：A页面跳转到B页面

方法：

在B页面的控制器中，编写对应的属性，在A页面跳转到B页面的地方，给B的属性赋值即可

//SecondViewController.h

@property (nonatomic) NSInteger flag;//当前系统标示(0：其他传值方式；1：block传值方式)

在A页面的试图控制器中

1.//RootViewController.m

- (IBAction)showSecondView:(id)sender {

SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

second.delegate = self;

second.flag = 0;

[self presentViewController:second animated:YES completion:nil];

}

//SecondViewController.h

@protocol secondViewDelegate

-(void)showName:(NSString *)nameString;

@end

设置代理(为防止循环引用，此处采用了weak)

//SecondViewController.h

@interface SecondViewController : UIViewController

@property (nonatomic, weak)id delegate;

@property (nonatomic, copy) ablock block;

@end

//SecondViewController.m

- (IBAction)delegateMethod:(id)sender {

if([self notEmpty]) {

[self.delegate showName:self.nameTextField.text];

[self dismissViewControllerAnimated:YES completion:nil];

}

else

{

[self showAlert];

}

}

//RootViewController.m

-(void)showName:(NSString *)nameString{

self.nameLabel.text = nameString;

}

最重要也是最容易忽略的，就是一定要设置delegate的指向。 (2)通过通知notification的方式实现

在B页面的控制器中，发送通知：

//SecondViewController.m

- (IBAction)notificationMethod:(id)sender {

if ([self notEmpty]) {

[[NSNotificationCenter defaultCenter] postNotificationName:

@'ChangeNameNotification' object:self userInfo:@{@'name':self.nameTextField.text}];

[self dismissViewControllerAnimated:YES completion:nil];

}else{

[self showAlert];

}

}

在A页面的控制器中，注册通知：

//RootViewController.m

- (void)viewDidLoad{

[super viewDidLoad];

// Do any additional setup after loading the view from its nib.

[[NSNotificationCenter defaultCenter] addObserver:self selector:

@selector

(ChangeNameNotification:) name:@

'ChangeNameNotification'

object:nil];

}

当我们不使用时，要记得删掉通知：

//RootViewController.m

-(void)dealloc{

[[NSNotificationCenter defaultCenter] removeObserver:self];

}

调用，显示

//RootViewController.m

-(void)ChangeNameNotification:(NSNotification*)notification{

NSDictionary *nameDictionary = [notification userInfo];

self.nameLabel.text = [nameDictionary objectForKey:@ 'name'];

}

//SecondViewController.h

typedef void (^ablock)(NSString *str);

//SecondViewController.h

@property (nonatomic, copy) ablock block;

在B试图控制器中，当输入名字，点击对应的确定按钮后

- (IBAction)blockMethod:(id)sender {

if ([self notEmpty]) {

if(self.block) {

self.block(self.nameTextField.text);

[self dismissViewControllerAnimated:YES completion:nil];

}

}else{

[self showAlert];

}

}

在A试图显示，回调block

- (IBAction)showSecondWithBlock:(id)sender {

SecondViewController *second = [[SecondViewController alloc] initWithNibName:@

'SecondViewController' bundle:nil];

[self presentViewController:second animated:YES completion:nil];

second.block = ^(NSString *str){

self.nameLabel.text = str;

};

}

在查阅资料的过程中，我还看到了以下几种方案：

(1)使用SharedApplication,定义一个变量来传递(感觉和单例的方式一样)

(2)使用文件，或者NSUserdefault来传递

//通过文件或者UserDefault方式存值(感觉不太适合此类传值，如果要用文件或者UserDefault方式存值的话，可以考虑此方式)

- (IBAction)userDefaultMethod:(id)sender {

if ([self notEmpty]) {

[[NSUserDefaults standardUserDefaults] setObject:self.nameTextField.text forKey:@

'myNameText'

];

[self dismissViewControllerAnimated:YES completion:nil];

}else{

[self showAlert];

}

}

在A试图控制器显示

-(void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];

//如果想测试通过UserDefault方式传值或者通过单例方式传值，取消以下注释即可

/*

if ([[[NSUserDefaults standardUserDefaults] objectForKey:@'myNameText'] length] != 0) {

self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@'myNameText'];

[[NSUserDefaults standardUserDefaults] setObject:@'' forKey:@'myNameText']

}

DataSource *dataSource = [DataSource sharedDataSource];

if ([dataSource.myName length] != 0) {

self.nameLabel.text = dataSource.myName;

dataSource.myName = @'';

}

*/

}

(3)通过一个单例的class来传递

B试图控制器

//通过单例方式传值(感觉不太适合此类传值，如果要用单例方式传值的话，可以考虑此方式)

- (IBAction)singletonMethod:(id)sender {

if ([self notEmpty]) {

DataSource *dataSource = [DataSource sharedDataSource];

dataSource.myName = self.nameTextField.text;

[self dismissViewControllerAnimated:YES completion:nil];

}else{

[self showAlert];

}

}

A试图控制器显示

-(void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];

//如果想测试通过UserDefault方式传值或者通过单例方式传值，取消以下注释即可

/*

if ([[[NSUserDefaults standardUserDefaults] objectForKey:@'myNameText'] length] != 0) {

self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@'myNameText'];

[[NSUserDefaults standardUserDefaults] setObject:@'' forKey:@'myNameText'];

}

DataSource *dataSource = [DataSource sharedDataSource];

if ([dataSource.myName length] != 0) {

self.nameLabel.text = dataSource.myName;

dataSource.myName = @'';

}

*/

}

@end````

这里面用到了单例模式，编写了DataSource这个类，存放数据

import

@interface DataSource : NSObject

@property (nonatomic, strong) NSString myName;

+(DataSource)sharedDataSource;

@end````

@implementation DataSource

+(DataSource *)sharedDataSource{

static DataSource *dataSource = nil;

static dispatch_once_t once;

dispatch_once(&once, ^{

dataSource = [DataSource new

];

});

return dataSource;

}

@end````

程序运行截图

A视图：


B视图


当输入姓名，并点击对应的确认按钮后，会回到A视图，并显示在B视图中输入的姓名


祝：玩得开心，有什么别的办法或者不正确的地方，欢迎指正。