一个iOS图片选择器的DEMO(实现图片添加，宫格排列，图片长按删除，以及图片替换等功能)

浏览数：22 / 时间：2015年06月11日

　　在开发中，经常用到选择多张图片进行上传或作其他处理等等，以下DEMO满足了此功能中的大部分功能，可直接使用到项目中。

主要功能如下：

　　1，图片九宫格排列（可自动设置）

　　2，图片长按抖动（仿苹果软件删除时，图标抖动效果），可进入删除状态，再次单击进入普通状态

　　3，图片设置最大上限，加号按钮自动隐藏

　　4，已选图片可单击进行重新选择

　　5，无需代理，直接调用对应属性就可获取所有图片，并与显示顺序保持一致

　　效果图如下：

 1 //
 2 //  SZAddImage.h
 3 //  addImage
 4 //
 5 //  Created by mac on 14-5-21.
 6 //  Copyright (c) 2014年 shunzi. All rights reserved.
 7 //
 8 
 9 /**
10  * 使用说明:直接创建此view添加到你需要放置的位置即可.
11  * 属性images可以获取到当前选中的所有图片对象.
12  */
13 
14 #import <UIKit/UIKit.h>
15 
16 @interface SZAddImage : UIView
17 
18 /**
19  *  存储所有的照片(UIImage)
20  */
21 @property (nonatomic, strong) NSMutableArray *images;
22 
23 @end

  1 //
  2 //  SZAddImage.m
  3 //  addImage
  4 //
  5 //  Created by mac on 14-5-21.
  6 //  Copyright (c) 2014年 shunzi. All rights reserved.
  7 //
  8 
  9 #define imageH 100 // 图片高度
 10 #define imageW 75 // 图片宽度
 11 #define kMaxColumn 3 // 每行显示数量
 12 #define MaxImageCount 9 // 最多显示图片个数
 13 #define deleImageWH 25 // 删除按钮的宽高
 14 #define kAdeleImage @"close.png" // 删除按钮图片
 15 #define kAddImage @"add.png" // 添加按钮图片
 16 
 17 
 18 
 19 #import "SZAddImage.h"
 20 @interface SZAddImage()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
 21 {
 22     // 标识被编辑的按钮 -1 为添加新的按钮
 23     NSInteger editTag;
 24 }
 25 @end
 26 
 27 @implementation SZAddImage
 28 
 29 - (id)initWithFrame:(CGRect)frame
 30 {
 31     self = [super initWithFrame:frame];
 32     if (self) {
 33         UIButton *btn = [self createButtonWithImage:kAddImage andSeletor:@selector(addNew:)];
 34         [self addSubview:btn];
 35     }
 36     return self;
 37 }
 38 
 39 -(NSMutableArray *)images
 40 {
 41     if (_images == nil) {
 42         _images = [NSMutableArray array];
 43     }
 44     return _images;
 45 }
 46 
 47 // 添加新的控件
 48 - (void)addNew:(UIButton *)btn
 49 {
 50     // 标识为添加一个新的图片
 51     
 52     if (![self deleClose:btn]) {
 53         editTag = -1;
 54         [self callImagePicker];
 55     }
 56    
 57     
 58 }
 59 
 60 // 修改旧的控件
 61 - (void)changeOld:(UIButton *)btn
 62 {
 63     // 标识为修改(tag为修改标识)
 64     if (![self deleClose:btn]) {
 65         editTag = btn.tag;
 66         [self callImagePicker];
 67     }
 68 }
 69 
 70 // 删除"删除按钮"
 71 - (BOOL)deleClose:(UIButton *)btn
 72 {
 73     if (btn.subviews.count == 2) {
 74         [[btn.subviews lastObject] removeFromSuperview];
 75         [self stop:btn];
 76         return YES;
 77     }
 78     
 79     return NO;
 80 }
 81 
 82 // 调用图片选择器
 83 - (void)callImagePicker
 84 {
 85     UIImagePickerController *pc = [[UIImagePickerController alloc] init];
 86     pc.allowsEditing = YES;
 87     pc.delegate = self;
 88     [self.window.rootViewController presentViewController:pc animated:YES completion:nil];
 89 }
 90 
 91 
 92 // 根据图片名称或者图片创建一个新的显示控件
 93 - (UIButton *)createButtonWithImage:(id)imageNameOrImage andSeletor : (SEL)selector
 94 {
 95     UIImage *addImage = nil;
 96     if ([imageNameOrImage isKindOfClass:[NSString class]]) {
 97        addImage = [UIImage imageNamed:imageNameOrImage];
 98     }
 99     else if([imageNameOrImage isKindOfClass:[UIImage class]])
100     {
101         addImage = imageNameOrImage;
102     }
103     UIButton *addBtn = [UIButton buttonWithType:UIButtonTypeCustom];
104     [addBtn setImage:addImage forState:UIControlStateNormal];
105     [addBtn addTarget:self action:selector forControlEvents:UIControlEventTouchUpInside];
106     addBtn.tag = self.subviews.count;
107    
108     // 添加长按手势,用作删除.加号按钮不添加
109     if(addBtn.tag != 0)
110     {
111     UILongPressGestureRecognizer *gester = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
112     [addBtn addGestureRecognizer:gester];
113     }
114     return addBtn;
115     
116 }
117 
118 
119 // 长按添加删除按钮
120 - (void)longPress : (UIGestureRecognizer *)gester
121 {
122     if (gester.state == UIGestureRecognizerStateBegan)
123     {
124     UIButton *btn = (UIButton *)gester.view;
125     
126     UIButton *dele = [UIButton buttonWithType:UIButtonTypeCustom];
127     dele.bounds = CGRectMake(0, 0, deleImageWH, deleImageWH);
128     [dele setImage:[UIImage imageNamed:kAdeleImage] forState:UIControlStateNormal];
129     [dele addTarget:self action:@selector(deletePic:) forControlEvents:UIControlEventTouchUpInside];
130     dele.frame = CGRectMake(btn.frame.size.width - dele.frame.size.width, 0, dele.frame.size.width, dele.frame.size.height);
131     
132     [btn addSubview:dele];
133     [self start : btn];
134         
135         
136     }
137     
138 }
139 
140 // 长按开始抖动
141 - (void)start : (UIButton *)btn {
142     double angle1 = -5.0 / 180.0 * M_PI;
143     double angle2 = 5.0 / 180.0 * M_PI;
144     CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
145     anim.keyPath = @"transform.rotation";
146     
147     anim.values = @[@(angle1),  @(angle2), @(angle1)];
148     anim.duration = 0.25;
149     // 动画的重复执行次数
150     anim.repeatCount = MAXFLOAT;
151     
152     // 保持动画执行完毕后的状态
153     anim.removedOnCompletion = NO;
154     anim.fillMode = kCAFillModeForwards;
155     
156     [btn.layer addAnimation:anim forKey:@"shake"];
157 }
158 
159 // 停止抖动
160 - (void)stop : (UIButton *)btn{
161     [btn.layer removeAnimationForKey:@"shake"];
162 }
163 
164 // 删除图片
165 - (void)deletePic : (UIButton *)btn
166 {
167     [self.images removeObject:[(UIButton *)btn.superview imageForState:UIControlStateNormal]];
168     [btn.superview removeFromSuperview];
169     if ([[self.subviews lastObject] isHidden]) {
170         [[self.subviews lastObject] setHidden:NO];
171     }
172     
173     
174 }
175 
176 // 对所有子控件进行布局
177 - (void)layoutSubviews
178 {
179     [super layoutSubviews];
180     int count = self.subviews.count;
181     CGFloat btnW = imageW;
182     CGFloat btnH = imageH;
183     int maxColumn = kMaxColumn > self.frame.size.width / imageW ? self.frame.size.width / imageW : kMaxColumn;
184     CGFloat marginX = (self.frame.size.width - maxColumn * btnW) / (count + 1);
185     CGFloat marginY = marginX;
186     for (int i = 0; i < count; i++) {
187         UIButton *btn = self.subviews[i];
188         CGFloat btnX = (i % maxColumn) * (marginX + btnW) + marginX;
189         CGFloat btnY = (i / maxColumn) * (marginY + btnH) + marginY;
190         btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
191     }
192     
193 }
194 
195 #pragma mark - UIImagePickerController 代理方法
196 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
197 {
198     UIImage *image = info[UIImagePickerControllerEditedImage];
199     if (editTag == -1) {
200         // 创建一个新的控件
201         UIButton *btn = [self createButtonWithImage:image andSeletor:@selector(changeOld:)];
202         [self insertSubview:btn atIndex:self.subviews.count - 1];
203         [self.images addObject:image];
204         if (self.subviews.count - 1 == MaxImageCount) {
205             [[self.subviews lastObject] setHidden:YES];
206            
207         }
208     }
209     else
210     {
211         // 根据tag修改需要编辑的控件
212         UIButton *btn = (UIButton *)[self viewWithTag:editTag];
213         int index = [self.images indexOfObject:[btn imageForState:UIControlStateNormal]];
214         [self.images removeObjectAtIndex:index];
215         [btn setImage:image forState:UIControlStateNormal];
216         [self.images insertObject:image atIndex:index];
217     }
218     // 退出图片选择控制器
219     [picker dismissViewControllerAnimated:YES completion:nil];
220 }
221 
222 
223 
224 @end