iOS七种传值总结（关键代码）

iOS七种传值总结（关键代码）

ViewController = 启动后的主界面

ZQMainVC = 主界面中的二级界面

ZQResignVC = 主界面中的二级界面

ZQShareManager = 单例的类

RedView = ViewController的子View

一、初始化传值：适用上一级界面往下一级界面传值 ViewController-> ZQMainVC

=============ZQMainVC类============

//写个类似构造函数的方法

@implementationZQMainVC

-(id)initWithUserName:(NSString*)userName WithPassWord:(NSString *)passWord {

self = [super init];

if (self) {

_passWord=passWord;

_userName=userName;

}

return self;

}

=============ViewController类=============

//调用传值处

ZQMainVC *mainVC=[[ZQMainVC alloc]initWithUserName:_userNameText.textWithPassWord:_passWordText.text];

[self.navigationController pushViewController:mainVC animated:YES];

二、属性传值：只适用于上级界面对下一级界面的跳转赋值 ViewController-> ZQMainVC和初始化传值比较，代码可读性低

=============ViewController类=============

ZQMainVC *mainVC=[[ZQMainVC alloc]init];

//直接对属性赋值,

mainVC.userName=_userNameText.text;

mainVC.passWord=_passWordText.text;

[self.navigationController pushViewController:mainVC animated:YES];

三、代理传值：适合下一级界面回传值给上一级 ZQResignVC-> ViewController

=============ZQResignVC类=============

//写代理方法

@protocolZQResignVCDelegate <NSObject>

-(void)sendMessage:(NSString*)userName withPassword:(NSString *)password;

@end

//定义属性

@property(nonatomic,assign)id<ZQResignVCDelegate>delegate;

//调用处

-(void)buttonClick:(UIButton*)button{

if (self.delegate&&[self.delegaterespondsToSelector:@selector(sendMessage:withPassword:)]) {

[self.delegate sendMessage:_userNameText.textwithPassword:_passWordText.text];

}

[self.navigationController popToRootViewControllerAnimated: YES];

}

=============ViewController类=============

ZQResignVC *resignVC=[[ZQResignVC alloc]init];

// 设置代理

resignVC.delegate=self;

[self.navigationController pushViewController:resignVC animated:YES];

四、单例传值：对没有跳转关系的两个controller进行传值（有拿Appdelegate当单例的用法，一个意思，区别在于Appdelegate中一大堆的属性。。。乱）

============= ZQShareManager=============

@interface ZQShareManager : NSObject

@property (copy, nonatomic) NSString *userName;

@property (copy, nonatomic) NSString *password;

// 申明一个类方法

+ (ZQShareManager *)shareUserInfo;

@end

@implementation ZQShareManager

+ (ZQShareManager *)shareUserInfo{

static ZQShareManager *shareManager = nil;

static dispatch_once_t predicate;

dispatch_once(&predicate, ^{

shareManager = [[self alloc] init];

});

return shareManager;

}

@end

// 怎么用就不写了，在想保存的地方对ZQShareManager的属性赋值，在想用的地方调用ZQShareManager中的属性

五、NSuserDefault传值：对没有跳转关系的两个controller进行传值（类似弄个sqlite数据库传值了，或写个文件传值，区别单例在于，应用被kill后再次启动还有值，而上面的单例重启应用后，就木有值了）

=============ViewController类=============

-(void)buttonClick:(UIButton *)button{

// 赋值保存

[[NSUserDefaults standardUserDefaults]setValue:_userNameText.text forKey:@"UserId"];

[[NSUserDefaults standardUserDefaults]setValue:_passWordText.text forKey:@"PassWord"];

// 写入NSUserDefaults

[[NSUserDefaults standardUserDefaults]synchronize];

ZQMainVC *mainVC=[[ZQMainVC alloc]init];

[self.navigationController pushViewController:mainVC animated:YES];

}

=============ZQMainVC类============

// 需要用到的地方取出NSUserDefaults中的值

self.userName=[[NSUserDefaults standardUserDefaults]objectForKey:@"UserId"];

self.passWord=[[NSUserDefaults standardUserDefaults]objectForKey:@"PassWord"];

六、通知传值：对没有跳转关系的两个controller进行传值，这个要用的话一定要谨慎，主要用在线程中，比如下载东西，你都不知道什么时候会触发下载完的时候，才考虑用发通知的方式，这东西用多了，代码可读性变得非常差

=============ZQResignVC类=============

// 点击按钮发送通知

-(void)buttonClick:(UIButton *)button{

[self textResignFirstResponder];

/***************通知传值****************/

NSArray *array=[[NSArray alloc]initWithObjects:_userNameText.text,_passWordText.text, nil];

//发送通知 sendMessage表示通知详情 array表示传输数据

[[NSNotificationCenter defaultCenter] postNotificationName:@"ZQSendMessage" object:array];

/*****************通知传值****************/

[self.navigationController popToRootViewControllerAnimated: YES];

}

============= ViewController =============

//-viewDidLoad方法中注册接受通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getZQMessage:) name:@"ZQSendMessage" object:nil];

//解析通知中的数据赋值

-(void)getZQMessage:(NSNotification *)notification{

NSArray *array=[[NSArray alloc]initWithArray:notification.object];

_userNameText.text=array[0];

_passWordText.text=array[1];

}

// 记得界面如果界面销毁移除掉通知监听

-(void)dealloc

{

[[NSNotificationCenter defaultCenter] removeObserver:self];

}

七、block传值：适用于子界面中的点击事件回传，比在子界面写一大堆delegeta要看着方便，用于子线程回调也OK

=============RedView=============

@class RedView;

typedef void(^TouchButton)(RedView *);

@interface RedView : UIView

@property(nonatomic,copy)TouchButton block;

@property(nonatomic,retain) NSString *title;

@end

@interface RedView()

{

UIButton *button;

}

@end

@implementation RedView

- (id)initWithFrame:(CGRect)frame{

self = [super initWithFrame:frame];

if (self) {

button = [UIButton buttonWithType:UIButtonTypeSystem];

[button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

button.frame = frame;

button.backgroundColor = [UIColor redColor];

[self addSubview:button];

}

return self;

}

-(void)buttonClick:(id)sender{

NSLog(@"点击");

_title = @"装请带上我飞";

_block(self);

}

@end

=============ViewController=============

RedView *rView = [[RedView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

rView.block = ^(RedView *button){

// 注意block的循环引用问题

title.text = button.title;

};