导航视图（一）

模态框视图

1、利用xib自定义一个新的ViewController ModalPageController;

2、在原有的视图控制器中触发跳转，代码如下：

ModalPageController *modelPageController = [[ModalPageController alloc]initWithNibName:@"ModalPageController" bundle:nil];
    
    modelPageController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    
    [self presentViewController:modelPageController animated:YES completion:^{
        NSLog(@"modelPageController");
    }];

3、在ModalPageController中返回，代码如下：

[self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Close");
    }];

4、两个  ViewController之间的数据交换：

4.1 利用 NSNotificationCenter

1）在原有的ViewController总定义并设置回调，代码如下：

//viewDidLoad里
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(doComplete:) name:@"testComplete" object:nil];


//定义回调函数
-(void)doComplete:(NSNotification*)notification{
    NSDictionary *data = [notification userInfo];
    if(nil != data){
        NSString *input = [data objectForKey:@"InputText"];
        NSLog(@"%@", input);
    }
}

2）在ModalPageController的返回中，实现通知：

    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Close");
        
        NSString *input = self.inputText.text;
        
        NSDictionary *dic = [NSDictionary dictionaryWithObject:input forKey:@"InputText"];
        [[NSNotificationCenter defaultCenter]postNotificationName:@"testComplete" object:nil userInfo:dic];
        
        
    }];

4.2 利用协议

1）定义一个protocal

#import <Foundation/Foundation.h>

@protocol doBack <NSObject>

-(void)getInputText:(NSString *)input;

@end

2)定义原ViewController遵循并实现该协议，如下：

#import <UIKit/UIKit.h>
#import "doBack.h"

@interface ViewController : UIViewController<doBack>

@end

-(void)getInputText:(NSString *)input{
    NSLog(@"%@", input);
}

3)、在ModelPageController中定义代理，并在跳转前将该代理指向原ViewController

//ModalPageController.h中
@property(nonatomic,assign) NSObject<doBack> *delegate;

//
ModalPageController *modelPageController = [[ModalPageController alloc]initWithNibName:@"ModalPageController" bundle:nil];
    
    modelPageController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    modelPageController.delegate = self; //相当于取得原来ViewController的引用
    
    [self presentViewController:modelPageController animated:YES completion:^{
        NSLog(@"modelPageController");
    }];

4)、在ModalPageController需要的地方调用：

[self.delegate getInputText:@"hello Delegate"];