ios开发-页面从后往前传值经典例题

#import <Foundation/Foundation.h>

@interface ABPerson : NSObject
@property(nonatomic,strong)UIImage *image;
@property(nonatomic,strong)NSString *number;
@end

@implementation ABPerson
-(void)dealloc{
    self.number = nil;
    self.image = nil;
}
@end

#import <Foundation/Foundation.h>
#import"ABPerson.h"
@interface ABPersonInfo : NSObject
+ (instancetype)defaultManager;

//添加联系人
- (void)addPersonInfoObject:(ABPerson *)personInfo;
//获取对应下标值的联系人信息
- (ABPerson *)personInfoObjectAtIndex:(NSUInteger) index;
//获取联系人的个数
- (NSUInteger)personInfoCount;
@end

#import "ABPersonInfo.h"

@interface ABPersonInfo()
@property (nonatomic ,readonly) NSMutableArray *personInfoList;
@end




@implementation ABPersonInfo

+ (instancetype)defaultManager
{
    static ABPersonInfo *s_ABPersonInfo= nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if (s_ABPersonInfo == nil) {
            s_ABPersonInfo = [[ABPersonInfo alloc] init];
        }
    });
   
    return s_ABPersonInfo;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        //实例化单例对象内的联系人存储机制...
        _personInfoList = [[NSMutableArray alloc] init];
    }
    return self;
}

//添加联系人
- (void)addPersonInfoObject:(ABPerson *)personInfo
{
    [self.personInfoList addObject:personInfo];
       NSLog(@"%@",self.personInfoList);
}
//获取对应下标值的联系人信息
- (ABPerson *)personInfoObjectAtIndex:(NSUInteger) index;
{
    if(index >= self.personInfoCount)
        return nil;
    return self.personInfoList[index];
}
//获取联系人的个数
- (NSUInteger)personInfoCount
{
    return self.personInfoList.count;
}

@end

#import <UIKit/UIKit.h>
#import "ABPerson.h"
#import "MYYSecondViewController.h"
@interface MYYFirstViewController : UIViewController
@property(nonatomic,strong)UIImageView *headImage;
@property(nonatomic,strong)ABPerson *personInfo;
-(IBAction)didClickEnterButton:(id)sender;
@end

#import "MYYFirstViewController.h"
#import <sqlite3.h>

//创建表格的回调函数
int createCallBack (void *content,int intValue,char **char1,char **char2){
    NSLog(@"%s",__func__);
    return 1;
}
@interface MYYFirstViewController ()

@end

@implementation MYYFirstViewController{
    NSUInteger sum;
    NSUInteger sub;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
   // NSUInteger count = [[ABPersonInfo defaultManager]personInfoCount];
//    ABPerson *personInfo =  [[ABPersonInfo defaultManager]personInfoObjectAtIndex:0];
//   self.title = personInfo.number;
//    self.headImage.image =personInfo.image;
// 
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"3icon"] style:UIBarButtonItemStyleDone target:self action:@selector(_didClickNextPage:)];
    self.navigationItem.rightBarButtonItem = rightButton;
   
    UIBarButtonItem *rightButton1 = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"2icon"] style:UIBarButtonItemStyleDone target:self action:@selector(_didClickNextPage1:)];
    self.navigationItem.leftBarButtonItem = rightButton1;
   
      UIImage *image = [UIImage imageNamed:@"1"];
     self.headImage = [[UIImageView alloc] initWithImage:image];
   
    [self.view addSubview:self.headImage];
   
   [ self.headImage setFrame:CGRectMake(120, 120, 80, 80)];
   
   
   
    //    //打开文件
   NSString *documentPath =NSSearchPathForDirectoriesInDomains(9, 1, 1)[0];

    //    //创建文件名

   NSString *sqlitePath = [documentPath stringByAppendingString:@"/save.sqlite"];

     sqlite3 *db = NULL;
  
    //    //打开数据库
        int result = sqlite3_open(sqlitePath.UTF8String, &db);
  
   
    //创建表个对象
    NSString *createSQL = @"create table PersonList(p_number text,p_image text);";
    char *error = NULL;
   
    result = sqlite3_exec(db, createSQL.UTF8String, createCallBack , @"hehe", &error);
  
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


-(IBAction)didClickEnterButton:(id)sender{
   
    MYYSecondViewController *secondVC = [[MYYSecondViewController alloc] initWithNibName:@"MYYSecondViewController" bundle:nil];
        [self.navigationController pushViewController:secondVC animated:YES];
}


-(NSUInteger)_didClickNextPage:(NSUInteger)sender{
       NSUInteger count = [[ABPersonInfo defaultManager]personInfoCount];
 
    if (sum < count) {
           ABPerson *personInfo =  [[ABPersonInfo defaultManager]personInfoObjectAtIndex:sum];
          self.title = personInfo.number;
          self.headImage.image =personInfo.image;
          sum++;

    }
    return sum;
    }

-(NSUInteger)_didClickNextPage1:(NSUInteger)sender{
    if (sum >0){
   
        ABPerson *personInfo =  [[ABPersonInfo defaultManager]personInfoObjectAtIndex:sum-1];
        self.title = personInfo.number;
        self.headImage.image =personInfo.image;
        sum--;
    }
    return sum;
}
@end

#import <UIKit/UIKit.h>
#import "ABPerson.h"
@interface MYYSecondViewController : UIViewController< UINavigationControllerDelegate, UIImagePickerControllerDelegate,UITextFieldDelegate]] > 

@property(nonatomic,strong)IBOutlet UITextField *numberField;
@property(nonatomic,strong)IBOutlet UIButton *imageButton;
@property(nonatomic,strong)ABPerson *person;
-(IBAction)didClickButton :(id)sender;


@end

#import "MYYSecondViewController.h"

@interface MYYSecondViewController ()

@property(nonatomic,strong)UIImage *tempImage;
@property(nonatomic,strong)NSString *tempNumber;
@end

@implementation MYYSecondViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    UIBarButtonItem *right = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(_didClickSave:)];
    self.navigationItem.rightBarButtonItem = right;
   
   

   
}


- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    if (self.person == nil) {
        self.person = [[ABPerson alloc] init];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


-(void)_didClickSave:(UIBarButtonItem *)sender{
    ABPerson *person = [[ABPerson alloc]init];
    person.image = self.tempImage;
    person.number = self.tempNumber;
    [[ABPersonInfo defaultManager]addPersonInfoObject:person];
    [self.navigationController popToRootViewControllerAnimated:YES];
}


-(IBAction)didClickButton :(id)sender{
    UIImagePickerController *pickerVC = [[UIImagePickerController alloc] init];
    [pickerVC setAllowsEditing:YES];
    [pickerVC setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    [pickerVC setDelegate:self];
    [self presentViewController:pickerVC animated:YES completion:NULL];
}

//#pragma mark - 图片获取代理对象
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:NULL];
    UIImage *image = info[UIImagePickerControllerOriginalImage];
    self.tempImage = image;
   
    [ self.imageButton setBackgroundImage:self.tempImage forState:UIControlStateNormal];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
return YES;
}

-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{
 
        self.tempNumber =self.numberField.text;
   
         return YES;
}
@end