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

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

2）SubViewController.m 文件代码实现

  #import "SubViewController.h"
   @interface SubViewController ()
   @end
 @implementation SubViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor = [UIColor grayColor];
     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self
  action:@selector(testAciton)];
 }
 -(void)testAciton
 {
      _callback([UIColor blueColor]);
     [self.navigationController popViewControllerAnimated:YES];
 }
 -(void)login:(NSString *)username password:(NSString *)password complete:(void(^)(UIColor *color))callback
 {
       callback([UIColor redColor]);
 }
 @end

3）ViewController.m 文件的代码实现：

 #import "ViewController.h"
 #import "SubViewController.h"
 @interface ViewController ()
 @end
 @implementation ViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks 
       target:self action:@selector(testAciton)];
 }
 -(void)testAciton
 {
     SubViewController *subvc = [[SubViewController alloc]init];
 //    subvc.callback --> void(^)(UIColor *)
     //传参与回调
     [subvc login:@"Admin" password:@"" complete:^(UIColor *color) {
         self.view.backgroundColor = color;
     }];
     [subvc setCallback:^(UIColor *color) {
         self.view.backgroundColor = color;
     }];
     [self.navigationController pushViewController:subvc animated:YES];
 }
 @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

 #import <Foundation/Foundation.h>
 @interface KKNotification : NSObject
 //观察者对象
 @property (nonatomic,strong) id observer;
 //观察者通知执行方法
 @property (nonatomic,assign) SEL selector;
 //观察者的键值
 @property (nonatomic,copy) NSString *name;
 //返回参数
 @property (nonatomic,strong) id object;
 @end

 @interface KKNotificationCenter : NSObject
 +(id)defaultCenter;
 -(void)addObserver:(id)observer selector:(SEL)sel name:(NSString *)name object:(id)object;
 -(void)postNotificationName:(NSString *)name object:(id)object;
 @end

2）KKNotificationCenter.m 文件实现代码

 #import "KKNotificationCenter.h"
 @implementation KKNotification
 @end
 @implementation KKNotificationCenter
 {
     NSMutableArray *_notArray;
 }

 +(id)defaultCenter
 {
     static KKNotificationCenter *_q = nil;
     if (!_q) {
         _q = [[KKNotificationCenter alloc]init];
     }
     return _q;
 }
 - (id)init
 {
     self = [super init];
     if (self) {
         _notArray = [[NSMutableArray alloc]init];
     }
     return self;
 }

 -(void)addObserver:(id)observer selector:(SEL)sel name:(NSString *)name object:(id)object
 {
    KKNotification *not = [[KKNotification alloc]init];
     not.observer = observer;
     not.selector = sel;
     not.name = name;
     [_notArray addObject:not];
 }

 -(void)postNotificationName:(NSString *)name object:(id)object
 {
     for (KKNotification *not in _notArray) {
         if ([not.name isEqualToString:name]) {
             not.object = object;
             [not.observer performSelector:not.selector withObject:not];
         }
     }
 }
 @end

3）在ViewController.m 视图文件中注册一个观察者 实例代码

 #import "ViewController.h"
 #import "SubViewController.h"
 #import "KKNotificationCenter.h"
 @interface ViewController ()
 @end
 @implementation ViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self
  action:@selector(testAciton)];

 //在通知中心里注册一个观察者:self
 //name:作为观察者的键值
 [[KKNotificationCenter defaultCenter]addObserver:self selector:@selector(notAction:)
 name:@"changeColor" object:nil];
   }

 -(void)notAction:(KKNotification *)not
 {
     self.view.backgroundColor = not.object;
 }

 -(void)testAciton
 {
     SubViewController *subvc = [[SubViewController alloc]init];
     [subvc setValue:@ forKey:@"age"];
     [subvc performSelector:@selector(testAciton) withObject:nil];
     [self.navigationController pushViewController:subvc animated:YES];
 }
 @end

4）SubViewController.h 文件中的代码实现

 #import <UIKit/UIKit.h>
 @interface SubViewController : UIViewController
 {
 @private
     int age;
 }
 -(void)test;
 @end

5）SubViewController.m   文件中执行通知的代码实现

 #import "SubViewController.h"
 #import "KKNotificationCenter.h"
 @interface SubViewController ()
 @end
 @implementation SubViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks
      target:self action:@selector(testAciton)];
 }
 -(void)testAciton
 {
     //通知中心广播
     //广播使用的名字,必须和注册时,使用的名字一致
     [[KKNotificationCenter defaultCenter]postNotificationName:@"changeColor" object:[UIColor redColor]];
     [self.navigationController popViewControllerAnimated:YES];
  }
 -(void)test
 {
     NSLog(@"%d",age);
 }
 @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

  #import <UIKit/UIKit.h>
 //枚举 区别控制器类型
 typedef NS_ENUM(NSUInteger, PlayerController) {
     PlayerControllerLeft,
     PlayerControllerRight,
     PlayerControllerCenter,
     PlayerControllerUp,
     PlayerControllerDown,
 };

 @interface SubViewController : UIViewController
 -(void)addTarget:(id)obj action:(SEL)action forEvents:(PlayerController)events;
 @end

2）SubViewController.m 文件中的代码实现

 #import "SubViewController.h"
 @interface SubViewController ()
 {
     id _leftObj;
     id _rightObj;
     SEL _leftSelector;
     SEL _rightSelector;
 }
 @end
 @implementation SubViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor = [UIColor grayColor];
     self.navigationItem.rightBarButtonItem  = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd 
       target:self action:@selector(leftAction)];
 }

 -(void)addTarget:(id)obj action:(SEL)action forEvents:(PlayerController)events
 {
     switch (events) {
         case PlayerControllerLeft:
         {
             _leftObj = obj;
             _leftSelector = action;
         }
             break;
         case PlayerControllerRight:
         {
             _rightObj = obj;
             _rightSelector = action;
         }
             break;
         default:
             break;
     }
 }
 -(void)leftAction
 {
     [_leftObj performSelector:_leftSelector withObject:nil];
     [self.navigationController popViewControllerAnimated:YES];
 }
 @end

3）ViewController.m 文件中的代码实现

 #import "ViewController.h"
 #import "SubViewController.h"
 @interface ViewController ()
 @end
 @implementation ViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     UIButton *btn
     = [UIButton buttonWithType:UIButtonTypeCustom];
     [btn addTarget:self action:@selector(clickAction) forControlEvents:UIControlEventTouchUpInside];
     btn.frame = CGRectMake(, , , );
     btn.backgroundColor = [UIColor blueColor];
     [self.view addSubview:btn];
 }

 -(void)clickAction
 {
     SubViewController *subvc = [[SubViewController alloc]init];
     [subvc addTarget:self action:@selector(leftAction) forEvents:PlayerControllerLeft];
     [subvc addTarget:self action:@selector(rightAction) forEvents:PlayerControllerRight];
     [self.navigationController pushViewController:subvc animated:YES];
 }
 -(void)leftAction
 {
     self.view.backgroundColor = [UIColor yellowColor];
 }
 -(void)rightAction
 {
     self.view.backgroundColor = [UIColor redColor];
 }
 @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

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

2）SubViewController.m文件中的代码实现

 #import "SubViewController.h"
 #import "ViewController.h"
 @interface SubViewController ()
 @end
 @implementation SubViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     self.title = @"界面二";
     self.view.backgroundColor = [UIColor grayColor];
     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks 
      target:self action:@selector(backAction)];
 }

 -(void)backAction
 {
 //    NSArray *arr = self.navigationController.viewControllers;
 //    UIViewController *vc = arr[arr.count - 2];
 //    ViewController *vc = (ViewController *)_delegate;
     [_delegate changeTitle:@"home"];
     [_delegate changeBackColor:[UIColor blueColor]];
     [_delegate changeViewColor:[UIColor yellowColor]];
     [self.navigationController popViewControllerAnimated:YES];
 }
 -(void)dealloc
 {
     NSLog(@"----------------------");
 }
 @end

3）ViewController.h文件中的代码实现

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

4）ViewController.m文件中的代码实现

 #import "ViewController.h"
 #import "SubViewController.h"
 @interface ViewController ()
 {
     UIView *_v;
     SubViewController *subvc;
 }
 @end
 @implementation ViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd 
       target:self  action:@selector(pushAction)];
     self.title = @"首页";
     _v = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
     [self.view addSubview:_v];
     _v.backgroundColor = [UIColor redColor];
     subvc = [[SubViewController alloc]init];
     subvc.delegate = self;
 }
-(void)pushAction
 {
     [self.navigationController pushViewController:subvc animated:YES];
 }
-(void)changeViewColor:(UIColor *)color
 {
     _v.backgroundColor = color;
 }
 -(void)changeTitle:(NSString *)title
 {
     self.title = title;
 }
 -(void)changeBackColor:(UIColor *)color
 {
     self.view.backgroundColor = color;
 }
 @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

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

2）SubViewController.m 文件中的代码实现

 #import "SubViewController.h"
  @interface SubViewController ()
 @end
 @implementation SubViewController
 - (void)viewDidLoad {
 [super viewDidLoad];
  self.title=_mtitle;
self.view.backgroundColor=_color;
}
 @end

3）FirstViewController.m 文件中的代码实现

 #import "FirstViewController.h"
 #import "SubViewController.h"
 @interface FirstViewController ()
 @end
 @implementation FirstViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor=[UIColor whiteColor];
     UIButton *button=[[UIButton alloc]init];
     button.frame=CGRectMake(, , , );
     button.backgroundColor=[UIColor blackColor];
     [button setTitle:@"下一页" forState:UIControlStateNormal];
     [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
     [button addTarget:self
 action:@selector(touchButton:) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:button];
 }

 -(void)touchButton:(UIButton*)button{
     button.backgroundColor=[UIColor grayColor];     

     SubViewController *subVC=[[SubViewController alloc]init];
     subVC.mtitle=@"页面二";
     subVC.color=[UIColor redColor];
     [self.navigationController pushViewController:subVC animated:YES];
 }
 @end