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iOS阶段学习第32天笔记(页面传值方法介绍)

iOS学习(UI)知识点整理

一、界面传值方法

1、方法一 Block传值通过SubView视图的Block向View视图传值改变View视图的背景色实例代码：

1）SubViewController.h 文件的代码实现

1 #import <UIKit/UIKit.h> 2 @interface SubViewController : UIViewController    3 @property (nonatomic,copy) void(^callback)(UIColor *color);  4 -(void)login:(NSString *)username password:(NSString *)password complete:(void(^)(UIColor *color))callback;  5 @end

2）SubViewController.m 文件代码实现

 1  #import "SubViewController.h"   2   @interface SubViewController ()   3   @end   4 @implementation SubViewController   5 - (void)viewDidLoad {  6     [super viewDidLoad];   7     self.view.backgroundColor = [UIColor grayColor];   8     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self  9  action:@selector(testAciton)];  10 }  12 -(void)testAciton 13 { 14      _callback([UIColor blueColor]);  15     [self.navigationController popViewControllerAnimated:YES]; 16 } 17 -(void)login:(NSString *)username password:(NSString *)password complete:(void(^)(UIColor *color))callback 19 { 20       callback([UIColor redColor]); 21 }  22 @end

3）ViewController.m 文件的代码实现：

 1 #import "ViewController.h"  2 #import "SubViewController.h"  3 @interface ViewController ()  4 @end  5 @implementation ViewController  6 - (void)viewDidLoad {  7     [super viewDidLoad];       8     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks 
       target:self action:@selector(testAciton)];    11 } 12 -(void)testAciton 13 { 14     SubViewController *subvc = [[SubViewController alloc]init]; 15 //    subvc.callback --> void(^)(UIColor *)  16     //传参与回调 17     [subvc login:@"Admin" password:@"123" complete:^(UIColor *color) { 18         self.view.backgroundColor = color; 19     }];  21     [subvc setCallback:^(UIColor *color) { 22         self.view.backgroundColor = color; 23     }]; 24     [self.navigationController pushViewController:subvc animated:YES]; 25 }  26 @end

2、方法二通知中心传值实例代码：

1）添加一个通知中心管理类 KKNotificationCenter.h 文件实现代码

 1 #import <Foundation/Foundation.h>  2 @interface KKNotification : NSObject  3 //观察者对象  4 @property (nonatomic,strong) id observer;  5 //观察者通知执行方法  6 @property (nonatomic,assign) SEL selector;  7 //观察者的键值  8 @property (nonatomic,copy) NSString *name;  9 //返回参数 10 @property (nonatomic,strong) id object; 11 @end 12  13 @interface KKNotificationCenter : NSObject 14 +(id)defaultCenter; 15 -(void)addObserver:(id)observer selector:(SEL)sel name:(NSString *)name object:(id)object; 16 -(void)postNotificationName:(NSString *)name object:(id)object; 17 @end

2）KKNotificationCenter.m 文件实现代码

 1 #import "KKNotificationCenter.h"  2 @implementation KKNotification  3 @end  4 @implementation KKNotificationCenter  5 {  6     NSMutableArray *_notArray;  7 }  8   9 +(id)defaultCenter 10 { 11     static KKNotificationCenter *_q = nil; 12     if (!_q) { 13         _q = [[KKNotificationCenter alloc]init]; 14     } 15     return _q; 16 }  18 - (id)init 19 { 20     self = [super init]; 21     if (self) { 22         _notArray = [[NSMutableArray alloc]init]; 23     } 24     return self; 25 } 26  27 -(void)addObserver:(id)observer selector:(SEL)sel name:(NSString *)name object:(id)object 28 { 29    KKNotification *not = [[KKNotification alloc]init]; 30     not.observer = observer; 31     not.selector = sel; 32     not.name = name; 33     [_notArray addObject:not]; 34 } 35  36 -(void)postNotificationName:(NSString *)name object:(id)object 37 { 38     for (KKNotification *not in _notArray) { 39         if ([not.name isEqualToString:name]) { 40             not.object = object; 41             [not.observer performSelector:not.selector withObject:not]; 42         } 43     } 44 } 45 @end

3）在ViewController.m 视图文件中注册一个观察者实例代码

 1 #import "ViewController.h"  2 #import "SubViewController.h"  3 #import "KKNotificationCenter.h"  4 @interface ViewController ()  5 @end  6 @implementation ViewController    7 - (void)viewDidLoad {  8     [super viewDidLoad];       9     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self 10  action:@selector(testAciton)]; 11      12 //在通知中心里注册一个观察者:self 13 //name:作为观察者的键值 14 [[KKNotificationCenter defaultCenter]addObserver:self selector:@selector(notAction:)  15 name:@"changeColor" object:nil]; 16   } 17  18 -(void)notAction:(KKNotification *)not 19 { 20     self.view.backgroundColor = not.object; 21 } 22   23 -(void)testAciton 24 { 25     SubViewController *subvc = [[SubViewController alloc]init];  27     [subvc setValue:@20 forKey:@"age"]; 28     [subvc performSelector:@selector(testAciton) withObject:nil];   30     [self.navigationController pushViewController:subvc animated:YES]; 31 } 32 @end

4）SubViewController.h 文件中的代码实现

 1 #import <UIKit/UIKit.h>  2 @interface SubViewController : UIViewController  3 {  4 @private  5     int age;  6 }   8 -(void)test;  10 @end

5）SubViewController.m 文件中执行通知的代码实现

 1 #import "SubViewController.h"  2 #import "KKNotificationCenter.h"  3 @interface SubViewController ()  4 @end  5 @implementation SubViewController  6 - (void)viewDidLoad {  7     [super viewDidLoad];  8    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks
      target:self action:@selector(testAciton)]; 10 }  12 -(void)testAciton 13 { 14     //通知中心广播 15     //广播使用的名字,必须和注册时,使用的名字一致 16     [[KKNotificationCenter defaultCenter]postNotificationName:@"changeColor" object:[UIColor redColor]];  17     [self.navigationController popViewControllerAnimated:YES]; 18  }  20 -(void)test 21 { 22     NSLog(@"%d",age); 23 }  24 @end

3、方法三 Target-Action 传值通过SubViewController传值改变ViewControllerd的背景色实例代码

1）SubViewController.h 文件中的代码实现

 1  #import <UIKit/UIKit.h>  2 //枚举 区别控制器类型  3 typedef NS_ENUM(NSUInteger, PlayerController) {  4     PlayerControllerLeft,  5     PlayerControllerRight,  6     PlayerControllerCenter,  7     PlayerControllerUp,  8     PlayerControllerDown,  9 }; 10  11 @interface SubViewController : UIViewController 12 -(void)addTarget:(id)obj action:(SEL)action forEvents:(PlayerController)events; 13 @end

2）SubViewController.m 文件中的代码实现

 1 #import "SubViewController.h"  2 @interface SubViewController ()  3 {  4     id _leftObj;  5     id _rightObj;  6     SEL _leftSelector;  7     SEL _rightSelector;  8 }  9 @end 10 @implementation SubViewController 11 - (void)viewDidLoad { 12     [super viewDidLoad];   14     self.view.backgroundColor = [UIColor grayColor];  15     self.navigationItem.rightBarButtonItem  = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd 
       target:self action:@selector(leftAction)]; 18 } 19  20 -(void)addTarget:(id)obj action:(SEL)action forEvents:(PlayerController)events 21 { 22     switch (events) { 23         case PlayerControllerLeft: 24         { 25             _leftObj = obj; 26             _leftSelector = action; 27         } 28             break; 29         case PlayerControllerRight: 30         { 31             _rightObj = obj; 32             _rightSelector = action; 33         } 34             break;  36         default: 37             break; 38     } 39 }  41 -(void)leftAction 42 { 43     [_leftObj performSelector:_leftSelector withObject:nil];  45     [self.navigationController popViewControllerAnimated:YES]; 46 }  48 @end

3）ViewController.m 文件中的代码实现

 1 #import "ViewController.h"  2 #import "SubViewController.h"  3 @interface ViewController ()  4 @end  5 @implementation ViewController  6 - (void)viewDidLoad {  7     [super viewDidLoad];  8     UIButton *btn  9     = [UIButton buttonWithType:UIButtonTypeCustom]; 10     [btn addTarget:self action:@selector(clickAction) forControlEvents:UIControlEventTouchUpInside]; 11     btn.frame = CGRectMake(10, 100, 300, 50); 12     btn.backgroundColor = [UIColor blueColor]; 13     [self.view addSubview:btn];  15 } 16  17 -(void)clickAction 18 { 19     SubViewController *subvc = [[SubViewController alloc]init];  21     [subvc addTarget:self action:@selector(leftAction) forEvents:PlayerControllerLeft];  23     [subvc addTarget:self action:@selector(rightAction) forEvents:PlayerControllerRight];  25     [self.navigationController pushViewController:subvc animated:YES]; 26 }  28 -(void)leftAction 29 { 30     self.view.backgroundColor = [UIColor yellowColor]; 31 }  33 -(void)rightAction 34 { 35     self.view.backgroundColor = [UIColor redColor]; 36 }  38 @end

4、方法四代理传值通过SubViewController传值改变ViewControllerd的背景色实例代码

1) SubViewController.h文件中的代码实现

 1 #import <UIKit/UIKit.h>  2 //协议的本质就是一个方法列表  3 @protocol Protocal <NSObject>  4 -(void)changeTitle:(NSString *)title;  5 -(void)changeBackColor:(UIColor *)color;  6 -(void)changeViewColor:(UIColor *)color;  7 @end  8 @interface SubViewController : UIViewController  9 @property (nonatomic,assign) id<Protocal> delegate; 10 @end

2）SubViewController.m文件中的代码实现

 1 #import "SubViewController.h"  2 #import "ViewController.h"  3 @interface SubViewController ()  4 @end  5 @implementation SubViewController  6   7 - (void)viewDidLoad {  8     [super viewDidLoad];  9     self.title = @"界面二"; 10     self.view.backgroundColor = [UIColor grayColor]; 11     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks 
      target:self action:@selector(backAction)]; 13 } 14  15 -(void)backAction 16 { 17 //    NSArray *arr = self.navigationController.viewControllers;       18 //    UIViewController *vc = arr[arr.count - 2];      19 //    ViewController *vc = (ViewController *)_delegate;    21     [_delegate changeTitle:@"home"];  22     [_delegate changeBackColor:[UIColor blueColor]];  23     [_delegate changeViewColor:[UIColor yellowColor]];  25     [self.navigationController popViewControllerAnimated:YES];  27 } 28 -(void)dealloc 29 { 30     NSLog(@"----------------------"); 31 } 32 @end

3）ViewController.h文件中的代码实现

 1 #import <UIKit/UIKit.h>  2 #import "SubViewController.h"   4 @interface ViewController : UIViewController<Protocal>   6 -(void)changeTitle:(NSString *)title;  7 -(void)changeBackColor:(UIColor *)color;  8 -(void)changeViewColor:(UIColor *)color;  10 @end

4）ViewController.m文件中的代码实现

 1 #import "ViewController.h"  2 #import "SubViewController.h"   3 @interface ViewController ()  4 {  5     UIView *_v;  6     SubViewController *subvc;  7 }  8 @end  10 @implementation ViewController  12 - (void)viewDidLoad { 13     [super viewDidLoad];  14     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd 
       target:self  action:@selector(pushAction)]; 17     self.title = @"首页";   18     _v = [[UIView alloc]initWithFrame:CGRectMake(100, 200, 200, 100)]; 19     [self.view addSubview:_v]; 20     _v.backgroundColor = [UIColor redColor];   21     subvc = [[SubViewController alloc]init]; 22     subvc.delegate = self;   23 } -(void)pushAction 26 { 27     [self.navigationController pushViewController:subvc animated:YES]; 28 } 29-(void)changeViewColor:(UIColor *)color 31 { 32     _v.backgroundColor = color; 33 }  -(void)changeTitle:(NSString *)title 36 { 37     self.title = title; 38 }  -(void)changeBackColor:(UIColor *)color 41 { 42     self.view.backgroundColor = color; 43 }  @end

5、方法五属性传值通过FirstViewController传值改变SubViewControllerd的背景色实例代码

1）SubViewController.h文件中的代码实现

1 #import <UIKit/UIKit.h>  2 @interface SubViewController : UIViewController  3 @property(nonatomic,strong) NSString *mtitle;  4 @property(nonatomic,strong) UIColor *color;  5 @end

2）SubViewController.m 文件中的代码实现

 1 #import "SubViewController.h"  2  @interface SubViewController ()  3 @end  4 @implementation SubViewController  5 - (void)viewDidLoad {  6 [super viewDidLoad];   self.title=_mtitle;  9self.view.backgroundColor=_color; } 12 @end

3）FirstViewController.m 文件中的代码实现

 1 #import "FirstViewController.h"  2 #import "SubViewController.h"  3 @interface FirstViewController ()  4 @end  5 @implementation FirstViewController  6 - (void)viewDidLoad {  7     [super viewDidLoad];  8     self.view.backgroundColor=[UIColor whiteColor];  9     UIButton *button=[[UIButton alloc]init]; 10     button.frame=CGRectMake(80, 100, 200, 30); 11     button.backgroundColor=[UIColor blackColor]; 12     [button setTitle:@"下一页" forState:UIControlStateNormal]; 13     [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; 14     [button addTarget:self  15 action:@selector(touchButton:) forControlEvents:UIControlEventTouchUpInside];  16     [self.view addSubview:button]; 17 } 18  19 -(void)touchButton:(UIButton*)button{   20     button.backgroundColor=[UIColor grayColor];      21   22     SubViewController *subVC=[[SubViewController alloc]init]; 23     subVC.mtitle=@"页面二"; 24     subVC.color=[UIColor redColor]; 25     [self.navigationController pushViewController:subVC animated:YES]; 26 } 27 @end