(纯代码)图片移动放大缩小：

#import "YYViewController.h"
 10 
 11 //私有扩展
 12 @interface YYViewController ()
 13 
 14 @property(nonatomic,weak)IBOutlet UIButton *headImageView;
 15 @end
 16 
 17 @implementation YYViewController
 18 
 19 //枚举类型，从1开始
 20 typedef enum
 21 {
 22     ktopbtntag=1,
 23     kdownbtntag,
 24     krightbtntag,
 25     kleftbtntag
 26 }btntag;
 27 
 28 //viewDidLoad是视图加载完成后调用的方法，通常在此方法中执行视图控制器的初始化工作
 29 - (void)viewDidLoad
 30 {
 31     
 32     //在viewDidLoad方法中，不要忘记调用父类的方法实现
 33     [super viewDidLoad];
 34 
 35     
 36     //手写控件代码
 37     //一、写一个按钮控件，上面有一张图片
 38     
 39     //1.使用类创建一个按钮对象
 40    // UIButton *headbtn=[[UIButton alloc] initWithFrame:CGRectMake(100 ,100, 100, 100)];
 41     //设置按钮对象为自定义型
 42     UIButton *headbtn=[UIButton buttonWithType:UIButtonTypeCustom];
 43     
 44     //2.设置对象的各项属性
 45     //(1)位置等通用属性设置
 46     headbtn.frame=CGRectMake(100, 100, 100, 100);
 47     
 48     //(2)设置普通状态下按钮的属性
 49     [headbtn setBackgroundImage:[UIImage imageNamed:@"i"] forState:UIControlStateNormal];
 50     [headbtn setTitle:@"点我！" forState:UIControlStateNormal];
 51     [headbtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
 52     
 53     //(3)设置高亮状态下按钮的属性
 54     [headbtn setBackgroundImage:[UIImage imageNamed:@"a"] forState:UIControlStateHighlighted];
 55     [headbtn setTitle:@"还行吧~" forState:UIControlStateHighlighted];
 56     [headbtn setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
 57     
 58     //3.把对象添加到视图中展现出来
 59     [self.view addSubview:headbtn];
 60     //注意点！
 61     self.headImageView=headbtn;
 62 
 63     
 64     //二、写四个控制图片左右上下移动方向的按钮控件
 65     
 66     /**================向上的按钮=====================*/
 67     //1.创建按钮对象
 68     UIButton *topbtn=[UIButton buttonWithType:UIButtonTypeCustom];
 69     
 70     //2.设置对象的属性
 71     topbtn.frame=CGRectMake(100, 250, 40, 40);
 72     [topbtn setBackgroundImage:[UIImage imageNamed:@"top_normal"] forState:UIControlStateNormal];
 73     [topbtn setBackgroundImage:[UIImage imageNamed:@"top_highlighted"] forState:UIControlStateHighlighted];
 74     [topbtn setTag:1];
 75     //3.把控件添加到视图中
 76     [self.view addSubview:topbtn];
 77     
 78     //4.按钮的单击控制事件
 79     [topbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
 80     
 81     
 82       /**================向下的按钮=====================*/
 83     //1.创建按钮对象
 84     UIButton *downbtn=[UIButton buttonWithType:UIButtonTypeCustom];
 85     //2.设置对象的属性
 86     downbtn.frame=CGRectMake(100, 350, 40, 40);
 87     [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_normal"] forState:UIControlStateNormal];
 88     [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_highlighted"] forState:UIControlStateHighlighted];
 89     [downbtn setTag:2];
 90     //3.把控件添加到视图中
 91     [self.view addSubview:downbtn];
 92     
 93     //4.按钮的单击控制事件
 94     [downbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
 95 
 96     
 97      /**================向左的按钮=====================*/
 98     //1.创建按钮对象
 99     UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
100     //2.设置对象的属性
101     leftbtn.frame=CGRectMake(50, 300, 40, 40);
102     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
103     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
104     [leftbtn setTag:4];
105     //3.把控件添加到视图中
106     [self.view addSubview:leftbtn];
107     
108     //4.按钮的单击控制事件
109     [leftbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
110     
111     
112     
113     /**================向右的按钮=====================*/
114     //1.创建按钮对象
115     UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
116     //2.设置对象的属性
117     rightbtn.frame=CGRectMake(150, 300, 40, 40);
118     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
119     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
120     [rightbtn setTag:3];
121     //3.把控件添加到视图中
122     [self.view addSubview:rightbtn];
123     
124     //4.按钮的单击控制事件
125     [rightbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];
126     
127       //三、写两个缩放按钮
128        /**================放大的按钮=====================*/
129     //1.创建对象
130     UIButton *plusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
131     //2.设置属性
132     plusbtn.frame=CGRectMake(75, 400, 40, 40);
133     [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_normal"] forState:UIControlStateNormal];
134     [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_highlighted"] forState:UIControlStateHighlighted];
135     [plusbtn setTag:1];
136     //3.添加到视图
137     [self.view addSubview:plusbtn];
138     //4.单击事件
139     [plusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];
140     
141     
142     /**================缩小的按钮=====================*/
143     UIButton *minusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
144     minusbtn.frame=CGRectMake(125, 400, 40, 40);
145     [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_normal"] forState:UIControlStateNormal];
146     [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_highlighted"] forState:UIControlStateHighlighted];
147     [minusbtn setTag:0];
148     [self.view addSubview:minusbtn];
149     [minusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];
150 }
151 
152 //控制方向的多个按钮调用同一个方法
153 -(void)Click:(UIButton *)button
154 {
155 
156     //练习使用frame属性
157     //CGRect frame=self.headImageView.frame;
158     
159     /**注意，这里如果控制位置的两个属性frame和center同时使用的话，会出现很好玩的效果，注意分析*/
160     //练习使用center属性
161     CGPoint center=self.headImageView.center;
162     switch (button.tag) {
163         case ktopbtntag:
164             center.y-=30;
165             break;
166         case kdownbtntag:
167             center.y+=30;
168             break;
169         case kleftbtntag:
170             //发现一个bug,之前的问题是因为少写了break,造成了它们的顺序执行，sorry
171            //center.x=center.x-30;
172             center.x-=50;
173             break;
174         case krightbtntag:
175             center.x+=50;
176             break;
177     }
178     
179  //  self.headImageView.frame=frame;
180     
181     //首尾式设置动画效果
182     [UIView beginAnimations:nil context:nil];
183     self.headImageView.center=center;
184     //设置时间
185     [UIView setAnimationDuration:2.0];
186     [UIView commitAnimations];
187     NSLog(@"移动!");
188     
189 }
190 -(void)Zoom:(UIButton *)btn
191 {
192     //使用frame，以自己的左上角（自己的原点）为原点
193 //    CGRect frame=self.headImageView.frame;
194 //    if (btn.tag) {
195 //        frame.size.height+=30;
196 //        frame.size.width+=30;
197 //    }
198 //    else
199 //    {
200 //        frame.size.width-=50;
201 //        frame.size.height-=50;
202 //    }
203 //    self.headImageView.frame=frame;
204     
205     
206     //使用bounds，以中心点位原点进行缩放
207     CGRect bounds = self.headImageView.bounds;
208     if (btn.tag) {
209         bounds.size.height+=30;
210         bounds.size.width+=30;
211     }
212     else
213     {
214         bounds.size.height-=50;
215         bounds.size.width-=50;
216     }
217     
218     //设置首尾动画
219     [UIView beginAnimations:nil context:nil];
220     self.headImageView.bounds=bounds;
221     [UIView setAnimationDuration:2.0];
222     [UIView commitAnimations];
223 }
224 @end