iOS-UI篇—简单的浏览器查看程序

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 
 5 @property (retain, nonatomic) NSArray *pic;
 6 @property (assign, nonatomic) NSInteger index;
 7 @property (weak, nonatomic) IBOutlet UILabel *lblIndex;
 8 @property (weak, nonatomic) IBOutlet UILabel *lblTitle;
 9 @property (weak, nonatomic) IBOutlet UIImageView *picture;
10 - (IBAction)nextPicture:(id)sender;
11 @property (weak, nonatomic) IBOutlet UIButton *btnnext;
12 
13 - (IBAction)lastPicture:(id)sender;
14 @property (weak, nonatomic) IBOutlet UIButton *btnLast;
15 
16 @end
17 @implementation ViewController
18 
19 
20 - (void)viewDidLoad {
21     [super viewDidLoad];
22     //让第一个图片显示出来，所以先调用一次
23     [self nextPicture:nil];
24 }
25 
26 - (void)didReceiveMemoryWarning {
27     [super didReceiveMemoryWarning];
28 }
29 
30 // 重写pic属性get方法---懒加载数据
31 - (NSArray *)pic
32 {   /*
33      写代码加载picture.plist文件中的数据到_pic;
34      1.获取picture.plist文件的路径
35      ps：[NSBundle mainBundle]获取这个app安装到手机上时的根目录
36      然后在根目录下搜索picture.plist文件路径
37      */
38     if (_pic == nil) {
39         NSString *string = [[NSBundle mainBundle] pathForResource:@"picture" ofType:@".plist"];
40         NSArray *array = [NSArray arrayWithContentsOfFile:string];
41         //NSLog(@"%@",array);
42         
43         _pic = array;
44         
45     }
46     return _pic;
47 }
48 
49 - (IBAction)nextPicture:(id)sender {
50     //1.让索引自加
51     _index++;
52     //2.从数组中获取当前这张图片的数据
53     NSDictionary *dict = self.pic[self.index-1];
54     //3.把获取到得数据设置给界面上的控件
55     self.lblIndex.text = [NSString stringWithFormat:@"%ld/%ld",self.index,self.pic.count];
56     //4.通过image属性来设置图片框里面的图片
57     self.picture.image =[UIImage imageNamed: dict[@"picture"]];
58     
59     self.lblTitle.text = dict[@"title"];
60     //设置“下一张”按钮是否可以点击
61     self.btnnext.enabled =( _index != self.pic.count);
62     //设置“上一张”按钮是否可以点击
63     self.btnLast.enabled =( _index-1 != 0);
64 
65 }
66 
67 - (IBAction)lastPicture:(id)sender {
68     _index--;
69     NSDictionary *dict = self.pic[self.index-1];
70     self.lblIndex.text = [NSString stringWithFormat:@"%ld/%ld",self.index,self.pic.count];
71     self.picture.image =[UIImage imageNamed: dict[@"picture"]];
72     self.lblTitle.text = dict[@"title"];
73     
74     self.btnLast.enabled =( _index-1 != 0);
75     self.btnnext.enabled =( _index != self.pic.count);
76 }
77 @end