AP102 2016/05/27

開一個master detail
自訂的類別

//
//  DataManager.h
//  HelloMyPhotoViewer
//
//  Created by Financialbrain on 2016/5/27.
//  Copyright © 2016年 DarisCode. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface DataManager : NSObject

//
+(instancetype)sharedInstance;


@end

//
//  DataManager.m
//  HelloMyPhotoViewer
//
//  Created by Financialbrain on 2016/5/27.
//  Copyright © 2016年 DarisCode. All rights reserved.
//

#import "DataManager.h"
//  _ 代表被包在裡面 沒事不給人家碰
// static 一啟動就配置 不因為任何原因回收記憶體

static DataManager *_singletonDataManager;


@implementation DataManager

//
+(instancetype)sharedInstance{

    if(_singletonDataManager == nil){
        _singletonDataManager = [DataManager new];
    }
    return _singletonDataManager;
}
@end

進到MasterViewController.m

->#import "DataManager.h"

@interface MasterViewController ()

@property NSMutableArray *objects;
@end

@implementation MasterViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
    self.navigationItem.rightBarButtonItem = addButton;
    self.detailViewController = (DetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController];

    // Try DataManager
   -> DataManager * dataManager = [DataManager sharedInstance];
}

//
//  DataManager.h
//  HelloMyPhotoViewer
//
//  Created by Financialbrain on 2016/5/27.
//  Copyright © 2016年 DarisCode. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface DataManager : NSObject

//
+(instancetype)sharedInstance;

-(NSInteger) getTotal;
-(NSString*) getFileNameByIndex:(NSInteger)index;
-(UIImage*) getImageByIndex:(NSInteger)index;

@end

+(instancetype)sharedInstance{

    if(_singletonDataManager == nil){
        _singletonDataManager = [DataManager new];
        [_singletonDataManager loadDatas];
    }
    return _singletonDataManager;
}

-(void)loadDatas{

    datas =[NSMutableArray new];

    for (int i =1; i<=10; i++) {
        NSString *filename =[NSString stringWithFormat:@"cat%d.jpg",i];
        [datas addObject:filename];

    }

-(NSInteger) getTotal{
    return datas.count;
}

-(NSString*) getFileNameByIndex:(NSInteger)index{
    return datas[index];
}


-(UIImage*) getImageByIndex:(NSInteger)index{
    NSString *filename = [self getFileNameByIndex:index];
    return [UIImage imageNamed:filename];
}