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)

　　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