iOS各類傳值

屬性傳值 將A頁面所擁有的信息經過屬性傳遞到B頁面使用 B頁面定義了一個naviTitle屬性，在A頁面中直接經過屬性賦值將A頁面中的值傳到B頁面。   A頁面DetailViewController.h文件   #import <UIKit/UIKit.h> #import "DetailViewController.h" @interface RootViewController :UIViewController<ChangeDelegate> {     UITextField *tf; } @end   A RootViewController.m頁面實現文件 #import "RootViewController.h" #import "DetailViewController.h"   @interface RootViewController () @end @implementation RootViewController //核心代碼 -(void)loadView {       UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];     btn.frame = CGRectMake(0, 0, 100, 30);     [btn setTitle:@"Push" forState:0];     [btn addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:btn]; }     -(void)pushAction:(id)sender {     tf = (UITextField *)[self.viewviewWithTag:1000];     //導航push到下一個頁面     //pushViewController 入棧引用計數+1，且控制權歸系統          DetailViewController *detailViewController = [[DetailViewControlleralloc]init];     //屬性傳值，直接屬性賦值     detailViewController.naviTitle =tf.text;     //導航push到下一個頁面     [self.navigationControllerpushViewController:detailViewController animated:YES];     [detailViewControllerrelease];    } B頁面DetailViewController.h文件   #import <UIKit/UIKit.h> @interface DetailViewController :UIViewController {    UITextField *textField;    NSString *_naviTitle; } @property(nonatomic,retain)NSString *naviTitle; @end B頁面.m實現文件   #import "DetailViewController.h" @interface DetailViewController () @end @implementation DetailViewController @synthesize naviTitle =_naviTitle; -(void)loadView {     self.view = [[[UIViewalloc]initWithFrame:CGRectMake(0,0, 320,480)]autorelease];    self.title = self.naviTitle ;     }   代理傳值  A頁面push到B頁面，若是B頁面的信息想回傳（回調）到A頁面，用用代理傳值，其中B定義協議和聲明代理，A確認並實現代理，A做爲B的代理   A頁面RootViewController.h文件   #import <UIKit/UIKit.h> #import "DetailViewController.h" @interface RootViewController : UIViewController<ChangeDelegate> {     UITextField *tf; } @end   A頁面RootViewController.m實現文件 #import "RootViewController.h" #import "DetailViewController.h"   @interface RootViewController () @end @implementation RootViewController //核心代碼 -(void)loadView {       UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];     btn.frame = CGRectMake(0, 0, 100, 30);     [btn setTitle:@"Push" forState:0];     //A頁面push到B頁面     [btn addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:btn];   }     -(void)pushAction:(id)sender {     tf = (UITextField *)[self.view viewWithTag:1000];     //導航push到下一個頁面     //pushViewController 入棧引用計數+1，且控制權歸系統     DetailViewController *detailViewController = [[DetailViewController alloc]init];         //代理傳值    detailViewController.delegate =self;//讓其自身做爲代理人     //導航push到下一個頁面     [self.navigationController pushViewController:detailViewController animated:YES];     [detailViewController release];    }   //實現代理方法 -(void)changeTitle:(NSString *)aStr {     tf = (UITextField *)[self.view viewWithTag:1000];     tf.text = aStr;//將從B頁面傳入的參數賦給A頁面中的TextField    tf.text = aStr; }   B頁面DetailViewController.m文件   #import <UIKit/UIKit.h> @interface DetailViewController : UIViewController {     UITextField *textField;     //定義代理     id<ChangeDelegate>_delegate; }   @property(nonatomic,assign)id<ChangeDelegate> delegate; @end //定義協議 @protocol ChangeDelegate <NSObject> -(void)changeTitle:(NSString *)aStr;//協議方法 @end     B頁面DetailViewController.h實現文件   #import "DetailViewController.h" @interface DetailViewController () @end @implementation DetailViewController -(void)loadView {     self.view = [[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]autorelease];       UIBarButtonItem *doneItem = [[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDonetarget:selfaction:@selector(doneAction:)];     self.navigationItem.rightBarButtonItem = doneItem;     [doneItemrelease]; }   //pop回前一個頁面 -(void)doneAction:(id)sender {    if (self.delegate && [self.delegaterespondsToSelector:@selector(changeTitle:)])//若代理存在且響應了changeTitle這個方法     {         //[self.delegate changeTitle:textField.text];         [self.delegatechangeTitle:textField.text];//將textField.text參數傳給changeTitle方法  讓代理，也就是A頁面去實現這個方法         NSLog(@"%@",self.navigationController.viewControllers);         [self.navigationControllerpopViewControllerAnimated:YES];     } }     單例傳值（實現共享） AppStatus.h  建立一個單例類 AppStatus #import <Foundation/Foundation.h>   @interface AppStatus : NSObject {     NSString *_contextStr; } @property(nonatomic,retain)NSString *contextStr;   +(AppStatus *)shareInstance;   @end AppStatus.m       #import "AppStatus.h"   @implementation AppStatus @synthesize contextStr = _contextStr;   static AppStatus *_instance = nil; +(AppStatus *)shareInstance {     if (_instance == nil)     {         _instance = [[super alloc]init];     }     return _instance; }   -(id)init {     if (self = [super init])     {              }     return  self; }   -(void)dealloc {     [super dealloc]; }   @end A頁面RootViewController.h #import "RootViewController.h" #import "DetailViewController.h" #import "AppStatus.h"   @interface RootViewController ()   @end   @implementation RootViewController -(void)loadView {     //核心代碼      UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];     btn.frame = CGRectMake(0, 0, 100, 30);     [btn setTitle:@"Push" forState:0];     [btn addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:btn]; } -(void)pushAction:(id)sender {           tf = (UITextField *)[self.view viewWithTag:1000];       //單例傳值  將要傳遞的信息存入單例中（共享中）   //  [[AppStatus shareInstance]setContextStr:tf.text]; 跟下面這種寫法是等價的     [AppStatus shareInstance].contextStr = tf.text;     //導航push到下一個頁面     //pushViewController 入棧引用計數+1，且控制權歸系統          DetailViewController *detailViewController = [[DetailViewController alloc]init];          //導航push到下一個頁面     [self.navigationController pushViewController:detailViewController animated:YES];     [detailViewController release]; }  @end   B頁面DetailViewController.h   #import <UIKit/UIKit.h> @protocol ChangeDelegate;//通知編譯器有此代理   @interface DetailViewController : UIViewController {     UITextField *textField; } @end B頁面DetailViewController.m #import "DetailViewController.h" #import "AppStatus.h"   @interface DetailViewController ()   @end   @implementation DetailViewController @synthesize naviTitle = _naviTitle;   -(void)loadView {     self.view = [[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]autorelease];          //單例     self.title = [AppStatus shareInstance].contextStr;               textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 150, 30)];     textField.borderStyle = UITextBorderStyleLine;     [self.view addSubview:textField];     [textField release];       UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDonetarget:self action:@selector(doneAction:)];     self.navigationItem.rightBarButtonItem = doneItem;     [doneItem release];      } //這個方法是執行多遍的  至關於刷新view -(void)viewWillAppear:(BOOL)animated {     [super viewWillAppear:animated];          tf = (UITextField *)[self.view viewWithTag:1000];     tf.text = [AppStatus shareInstance].contextStr;       }   //pop回前一個頁面 -(void)doneAction:(id)sender {     //  單例傳值     [AppStatus shareInstance].contextStr = textField.text;     [self.navigationController popToRootViewControllerAnimated:YES]; }      通知傳值 誰要監聽值的變化，誰就註冊通知  特別要注意，通知的接受者必須存在這一先決條件   A頁面RootViewController.h #import <UIKit/UIKit.h> #import "DetailViewController.h"   @interface RootViewController : UIViewController<ChangeDelegate> {     UITextField *tf; } @end    A頁面RootViewController.m   #import "IndexViewController.h" #import "DetailViewController.h" #import "AppStatus.h"     @implementation IndexViewController   -(void)dealloc {     [[NSNotificationCenter defaultCenter] removeObserver:self                                                     name:@"CHANGE_TITLE" object:nil];     [super dealloc]; }   -(id)init {     if (self = [super init])     {         [[NSNotificationCenter defaultCenter] addObserver:self                                                  selector:@selector(change:)                                                      name:@"CHANGE_TITLE"                                                    object:nil];     }     return self; }   -(void)change:(NSNotification *)aNoti {     // 通知傳值     NSDictionary *dic = [aNoti userInfo];     NSString *str = [dic valueForKey:@"Info"];               UITextField *tf =  (UITextField *)[self.view viewWithTag:1000];     tf.text = str; }     -(void)viewWillAppear:(BOOL)animated {     [super viewWillAppear:animated];          /*     // 單例傳值     UITextField *tf =  (UITextField *)[self.view viewWithTag:1000];     tf.text = [AppStatus shareInstance].contextStr;     */ } @end DetailViewController.h   #import <UIKit/UIKit.h> @protocol ChangeDelegate;//通知編譯器有此代理   @interface DetailViewController : UIViewController {     UITextField *textField; } @end    DetailViewController.m   #import "DetailViewController.h" #import "AppStatus.h"     @implementation DetailViewController @synthesize naviTitle = _naviTitle;   -(void)loadView {          UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDonetarget:self action:@selector(doneAction:)];     self.navigationItem.rightBarButtonItem = doneItem;     [doneItem release]; }   // pop回前一個頁面 -(void)doneAction:(id)sender {      NSDictionary *dic = [NSDictionary dictionaryWithObject:textField.text forKey:@"Info"];   [[NSNotificationCenter defaultCenter] postNotificationName:@"CHANGE_TITLE" object:nil userInfo:dic];   [self.navigationController popViewControllerAnimated:YES];   }   Block 幾種形式的Block     //無返回值     void (^block1) (void);     block1 = ^{         NSLog(@"bock demo");     };     block1();          //int返回類型     int (^block2) (void);     block2  = ^(void)     {         int a  = 1 ,b =1;         int c = a+b;         return  c;     };          //有返回 有參數     int (^block3)(int, int)= ^(int a, int b)     {         int c = a +b;         return c;              };     NSLog(@"bock=%d",block3(1,2));          //有返回值，有參數而且能夠修改block以外變量的block     static int sum = 10;// __blcik and static關鍵字 或者 _block int sum = 10     int (^block4) (int) =^(int a)     {         sum=11;         int c = sum+a;   //此時sum就是能夠修改的了，若沒加static或_block關鍵字則不能修改block以外變量         return c;     };     NSLog(@"block4= %d",block4(4));   Block傳值 例如A(Ablock)頁面的值傳道B(Bblock)頁面     在A頁面中ABlock.h @interface Ablock : UIViewController<UITableViewDelegate,UITableViewDataSource> {     UITableView *_tableview;     UILabel *labe;     UIImageView *imagevies; } @end   -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {     [_tableview deselectRowAtIndexPath:indexPath animated:YES];          Bblcok *bblock = [[Bblcok alloc] initwithBlock:Block_copy(^(NSString *aBlock){             labe.text = aBlock;         NSLog(@"%@",aBlock);     })];          bblock.imgeviews = imagevies.image;     bblock.String = labe.text;     [self.navigationController pushViewController:bblock animated:YES];     [bblock release]; }     在A頁面中Bblock.h #import <UIKit/UIKit.h> typedef  void (^MyBlock) (NSString *); @interface Bblcok : UIViewController {     UIImageView *image;     UITextField *aField;     UIButton *aButt;     NSString *_String;     id _imgeviews;     MyBlock myBlock; } @property(nonatomic,copy)MyBlock myBlock;    @property(nonatomic,retain) id imgeviews; @property(nonatomic,retain) NSString *String; -(id)initwithBlock:(MyBlock)aBlcok; @end   ////  Bblcok.m//  Blcok////  Created by zhu  on 13-8-12.//  Copyright (c) 2013年 Zhu Ji Fan. All rights reserved.//#import "Bblcok.h"@interface Bblcok ()@end@implementation Bblcok@synthesize imgeviews = _imgeviews , String = _String;@synthesize myBlock = _myBlock;-(id)initwithBlock:(MyBlock)aBlcok{    if (self = [super init])    {        self.myBlock = aBlcok;     }    return self;}-(void) dealloc{    [super dealloc];}-(void) loadView{    UIControl *cont = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 320, 568-44)];    [cont addTarget:self action:@selector(Clcik) forControlEvents:UIControlEventTouchUpInside];    self.view = cont;        aField = [[UITextField alloc] initWithFrame:CGRectMake(60, 10, 160, 30)];    aField.borderStyle = UITextBorderStyleLine;    aField.placeholder = self.String;    [self.view addSubview:aField];        aButt = [UIButton buttonWithType:UIButtonTypeRoundedRect];    aButt.frame = CGRectMake(60, 50, 70, 30);    [aButt setTitle:@"修改" forState:0];    [aButt addTarget:self action:@selector(aButtClcik:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:aButt];        image = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 210, 260)];    image.backgroundColor = [UIColor blueColor];    image.image = self.imgeviews;    [self.view addSubview:image];    [image release];}-(IBAction)aButtClcik:(id)sender{    NSString *sting = aField.text;    myBlock(sting);    [self.navigationController popToRootViewControllerAnimated:YES];}-(void)Clcik{    [aField resignFirstResponder];}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end