13.小项目：图片浏览器 版本3.0

---------------  ViewController.m  ---------------

#import <Foundation/Foundation.h>

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UILabel *indexLabel;

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@property (weak, nonatomic) IBOutlet UILabel *infoLabel;

@property (nonatomic, assign) int index;

@property (weak, nonatomic) IBOutlet UIButton *rightBtn;

@property (weak, nonatomic) IBOutlet UIButton *leftBtn;

@property (nonatomic, strong) NSArray *datas;

- (IBAction)nextImage;

- (IBAction)preImage;

-(void)changeImage;

@end

@implementation ViewController

-(void)viewDidLoad

{

    [super viewDidLoad];

    [self nextImage];

}

-(NSArray *)datas

{

    if (_datas == nil)

    {

        NSDictionary *d1 = @{@"icon":@"biaoqingdi", @"desc":@"在他面前，其他神马表情都弱爆了！"};

        NSDictionary *d2 = @{@"icon":@"bingli", @"desc":@"这也忒狠了"};

        NSDictionary *d3 = @{@"icon":@"chiniupa", @"desc":@"这小姑娘吃个牛排比杀牛还费劲啊"};

        NSDictionary *d4 = @{@"icon":@"danteng", @"desc":@"亲，你能改下你的网名吗"};

        NSDictionary *d5 = @{@"icon":@"wangba", @"desc":@"哥们为什么选八号呢"};

        self.datas = @[d1,d2,d3,d4,d5];

    }

    return _datas;

}

-(void)changeImage

{

    self.indexLabel.text = [NSString stringWithFormat:@"%d/%zd",self.index, self.datas.count];

    NSDictionary *data = self.datas[self.index-1];

    self.imageView.image = [UIImage imageNamed:data[@"icon"]];

    self.infoLabel.text = data[@"desc"];

    self.leftBtn.enabled = self.index != 1;

    self.rightBtn.enabled = self.index != self.datas.count;

}

- (IBAction)nextImage

{

    self.index++;

    [self changeImage];

}

- (IBAction)preImage

{

    self.index--;

    [self changeImage];

}

@end