8 9 #import "YYViewController.h"10 11 #define POTOIMGW    20012 #define POTOIMGH    30013 #define POTOIMGX    6014 #define  POTOIMGY    5015 16 @interface YYViewController ()17 18 @property(nonatomic,strong)UILabel *firstlab;19 @property(nonatomic,strong)UILabel *lastlab;20 @property(nonatomic,strong)UIImageView *icon;21 @property(nonatomic,strong)UIButton *leftbtn;22 @property(nonatomic,strong)UIButton *rightbtn;23 @property(nonatomic,strong)NSArray *array;24 @property(nonatomic ,assign)int i;25 -(void)change;26 @end27 28 29 30 @implementation YYViewController31 32 - (void)viewDidLoad33 {34     [super viewDidLoad];35     [self change];36 }37 38 -(void)change39 {40     [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+1]];41     //先get再set42     43     self.icon.image=[UIImage imageNamed:self.array[self.i][@"name"]];44     self.lastlab.text=self.array[self.i][@"desc"];45   46     self.leftbtn.enabled=(self.i!=0);47     self.rightbtn.enabled=(self.i!=4);48 }49 50 //延迟加载51 /**1.图片的序号标签*/52 -(UILabel *)firstlab53 {54     //判断是否已经有了，若没有，则进行实例化55     if (!_firstlab) {56         _firstlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, 300, 30)];57         [_firstlab setTextAlignment:NSTextAlignmentCenter];58         [self.view addSubview:_firstlab];59     }60     return _firstlab;61 }62 63 /**2.图片控件的延迟加载*/64 -(UIImageView *)icon65 {66      //判断是否已经有了，若没有，则进行实例化67     if (!_icon) {68         _icon=[[UIImageView alloc]initWithFrame:CGRectMake(POTOIMGX, POTOIMGY, POTOIMGW, POTOIMGH)];69         UIImage *image=[UIImage imageNamed:@"biaoqingdi"];70         _icon.image=image;71         [self.view addSubview:_icon];72     }73     return _icon;74 }75 76 /**3.描述控件的延迟加载*/77 -(UILabel *)lastlab78 {79      //判断是否已经有了，若没有，则进行实例化80     if (!_lastlab) {81         _lastlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 400, 300, 30)];82         [_lastlab setTextAlignment:NSTextAlignmentCenter];83         [self.view addSubview:_lastlab];84     }85     return _lastlab;86 }87 88 /**4.左键按钮的延迟加载*/89 -(UIButton *)leftbtn90 {91      //判断是否已经有了，若没有，则进行实例化92     if (!_leftbtn) {93         _leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];94         _leftbtn.frame=CGRectMake(0, self.view.center.y, 40, 40);95         [_leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];96         [_leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];97         [self.view addSubview:_leftbtn];98         [_leftbtn addTarget:self action:@selector(leftclick:) forControlEvents:UIControlEventTouchUpInside];99     }
100     return _leftbtn;
101
102 }
103
104 /**5.右键按钮的延迟加载*/
105 -(UIButton *)rightbtn
106 {
107     if (!_rightbtn) {
108         _rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
109         _rightbtn.frame=CGRectMake(POTOIMGX+POTOIMGW+10, self.view.center.y, 40, 40);
110         [_rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
111         [_rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
112         [self.view addSubview:_rightbtn];
113         [_rightbtn addTarget:self action:@selector(rightclick:) forControlEvents:UIControlEventTouchUpInside];
114     }
115     return _rightbtn;
116 }
117
118 //array的get方法
119 -(NSArray *)array
120 {
121     if (_array==nil) {
122         NSString *path=[[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"];
123         _array=[[NSArray alloc]initWithContentsOfFile:path];
124     }
125     return _array;
126 }
127
128 -(void)rightclick:(UIButton *)btn
129 {
130     self.i++;
131     [self change];
132 }
133
134 -(void)leftclick:(UIButton *)btn
135 {
136     self.i--;
137     [self change];
138 }
139
140 @end