iOS頁面間傳值的方式

iOS頁面間傳值的方式（NSUserDefault/Delegate/NSNotification/Block/單例）實現了以下iOS頁面間傳值：1.委託delegate方式；2.通知notification方式；3.block方式；4.UserDefault或者文件方式；5.單例模式方式；6.通過設置屬性，實現頁面間傳值在iOS開發中，我們經常會遇到頁面間跳轉傳值的問題，現歸納總結一下：情況1：A頁面跳轉到B頁面方法：在B頁面的控制器中，編寫對應的屬性，在A頁面跳轉到B頁面的地方，給B的屬性賦值即可view sourceprint?1.//SecondViewController.hview sourceprint?1.@property(nonatomic) NSInteger flag;//當前系統標示（0：其他傳值方式；1：block傳值方式）在A頁面的試圖控制器中view sourceprint?1.//RootViewController.mview sourceprint?1.- (IBAction)showSecondView:(id)sender {2.SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController"bundle:nil];3.second.delegate = self;4.second.flag =0;5.[self presentViewController:second animated:YES completion:nil];6.}情況2：A頁面跳轉到B頁面，B頁面再跳轉回A頁面主流方案：（1）通過委託delegate的方式實現

設置協議及方法 view sourceprint?1.view sourceprint?1.//SecondViewController.hview sourceprint?1.@protocolsecondViewDelegate2.-(void)showName:(NSString *)nameString;3.@end設置代理(為防止循環引用，此處採用了weak)view sourceprint?1.view sourceprint?1.//SecondViewController.hview sourceprint?1.@interfaceSecondViewController : UIViewController2.@property(nonatomic, weak)id<secondViewDelegate> delegate;3.@property(nonatomic, copy) ablock block;4.@end調用view sourceprint?01.//SecondViewController.m02.- (IBAction)delegateMethod:(id)sender {03.if([self notEmpty]) {04.[self.delegate showName:self.nameTextField.text];05.[self dismissViewControllerAnimated:YES completion:nil];06.}else{07.[self showAlert];08.}09.}顯示 view sourceprint?1.//RootViewController.m2.-(void)showName:(NSString *)nameString{3.self.nameLabel.text = nameString;4.}最重要也是最容易忽略的，就是一定要設置delegate的指向。 （2）通過通知notification的方式實現

在B頁面的控制器中，發送通知：view sourceprint?01.//SecondViewController.m02.- (IBAction)notificationMethod:(id)sender {03.if([self notEmpty]) {04.[[NSNotificationCenter defaultCenter] postNotificationName:@"ChangeNameNotification"object:self userInfo:@{@"name":self.nameTextField.text}];05.[self dismissViewControllerAnimated:YES completion:nil];06.}else{07.[self showAlert];08.}09.}在A頁面的控制器中，註冊通知：view sourceprint?1.//RootViewController.m2.- (void)viewDidLoad3.{4.[superviewDidLoad];5.// Do any additional setup after loading the view from its nib.6.[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ChangeNameNotification:) name:@"ChangeNameNotification"object:nil];7.}當我們不使用時，要記得刪掉通知：view sourceprint?1.//RootViewController.m2.-(void)dealloc{3.[[NSNotificationCenter defaultCenter] removeObserver:self];4.}調用，顯示view sourceprint?1.//RootViewController.m2.3.-(void)ChangeNameNotification:(NSNotification*)notification{4.NSDictionary *nameDictionary = [notification userInfo];5.self.nameLabel.text = [nameDictionary objectForKey:@"name"];6.}（3）block方式實現block介紹:http://blog.csdn.net/totogo2010/article/details/7839061鏈接一篇描述block回調挺有意思的文章：http://blog.csdn.net/mobanchengshuang/article/details/11751671分析：在B試圖控制器中，定義一個block，參數為字元串view sourceprint?1.//SecondViewController.h2.typedefvoid(^ablock)(NSString *str);view sourceprint?1.//SecondViewController.h2.3.@property(nonatomic, copy) ablock block;在B試圖控制器中，當輸入名字，點擊對應的確定按鈕後view sourceprint?01.- (IBAction)blockMethod:(id)sender {02.if([self notEmpty]) {03.if(self.block) {04.self.block(self.nameTextField.text);05.[self dismissViewControllerAnimated:YES completion:nil];06.}07.}else{08.[self showAlert];09.}10.}在A試圖顯示，回調blockview sourceprint?1.- (IBAction)showSecondWithBlock:(id)sender {2.SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController"bundle:nil];3.[self presentViewController:second animated:YES completion:nil];4.second.block = ^(NSString *str){5.self.nameLabel.text = str;6.};7.}在查閱資料的過程中，我還看到了以下幾種方案：（1）使用SharedApplication,定義一個變數來傳遞（感覺和單例的方式一樣）（2）使用文件，或者NSUserdefault來傳遞view sourceprint?01.//通過文件或者UserDefault方式存值(感覺不太適合此類傳值，如果要用文件或者UserDefault方式存值的話，可以考慮此方式)02.- (IBAction)userDefaultMethod:(id)sender {03.if([self notEmpty]) {04.[[NSUserDefaults standardUserDefaults] setObject:self.nameTextField.text forKey:@"myNameText"];05.[self dismissViewControllerAnimated:YES completion:nil];06.}else{07.[self showAlert];08.}09.}在A試圖控制器顯示view sourceprint?01.-(void)viewDidAppear:(BOOL)animated{02.[superviewDidAppear:animated];03.//如果想測試通過UserDefault方式傳值或者通過單例方式傳值，取消以下注釋即可04./*05.if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"] length] != 0) {06.self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"];07.[[NSUserDefaults standardUserDefaults] setObject:@"" forKey:@"myNameText"];08.}09.DataSource *dataSource = [DataSource sharedDataSource];10.if ([dataSource.myName length] != 0) {11.self.nameLabel.text = dataSource.myName;12.dataSource.myName = @"";13.}14.*/15.}（3）通過一個單例的class來傳遞B試圖控制器view sourceprint?01.//通過單例方式傳值(感覺不太適合此類傳值，如果要用單例方式傳值的話，可以考慮此方式)02.- (IBAction)singletonMethod:(id)sender {03.if([self notEmpty]) {04.DataSource *dataSource = [DataSource sharedDataSource];05.dataSource.myName = self.nameTextField.text;06.[self dismissViewControllerAnimated:YES completion:nil];07.}else{08.[self showAlert];09.}10.}A試圖控制器顯示view sourceprint?01.-(void)viewDidAppear:(BOOL)animated{02.[superviewDidAppear:animated];03.//如果想測試通過UserDefault方式傳值或者通過單例方式傳值，取消以下注釋即可04./*05.if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"] length] != 0) {06.self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"];07.[[NSUserDefaults standardUserDefaults] setObject:@"" forKey:@"myNameText"];08.}09.DataSource *dataSource = [DataSource sharedDataSource];10.if ([dataSource.myName length] != 0) {11.self.nameLabel.text = dataSource.myName;12.dataSource.myName = @"";13.}14.*/15.}16.@end這裡面用到了單例模式，編寫了DataSource這個類，存放數據view sourceprint?01.//02.// DataSource.h03.// TestCallBack04.//05.// Created by csdc-iMac on 14-7-17.06.// Copyright (c) 2014年 JuneWang. All rights reserved.07.//08.09.#import<Foundation/Foundation.h>10.11.@interfaceDataSource : NSObject12.@property(nonatomic, strong) NSString *myName;13.+(DataSource*)sharedDataSource;14.@endview sourceprint?01.//02.// DataSource.m03.// TestCallBack04.//05.// Created by csdc-iMac on 14-7-17.06.// Copyright (c) 2014年 JuneWang. All rights reserved.07.//08.09.#import"DataSource.h"10.11.@implementationDataSource12.+(DataSource *)sharedDataSource{13.staticDataSource *dataSource = nil;14.staticdispatch_once_t once;15.dispatch_once(&once, ^{16.dataSource = [DataSourcenew];17.});18.returndataSource;19.}20.@end程序運行截圖A視圖：

B視圖

當輸入姓名，並點擊對應的確認按鈕後，會回到A視圖，並顯示在B視圖中輸入的姓名

祝：玩得開心，有什麼別的辦法或者不正確的地方，歡迎指正。如果寫得不詳細，可以通過源碼分析。參考：http://blog.csdn.net/cocoarannie/article/details/11857141http://www.cnblogs.com/heri/archive/2013/03/18/2965815.html源碼地址：https://github.com/wangtao169447/PassValue出處：http://www.cnblogs.com/JuneWang/p/3850859.html
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