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:@"123" 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:@20 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(10, 100, 300, 50);
    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(100, 200, 200, 100)];
    [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(80, 100, 200, 30);
    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