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：

 //
 //  SZAddImage.h
 //  addImage
 //
 //  Created by mac on 14-5-21.
 //  Copyright (c) 2014年 shunzi. All rights reserved.
 //

 /**
  * 使用说明:直接创建此view添加到你需要放置的位置即可.
  * 属性images可以获取到当前选中的所有图片对象.
  */

 #import <UIKit/UIKit.h>

 @interface SZAddImage : UIView

 /**
  *  存储所有的照片(UIImage)
  */
 @property (nonatomic, strong) NSMutableArray *images;

 @end

 //
 //  SZAddImage.m
 //  addImage
 //
 //  Created by mac on 14-5-21.
 //  Copyright (c) 2014年 shunzi. All rights reserved.
 //

 #define imageH 100 // 图片高度
 #define imageW 75 // 图片宽度
 #define kMaxColumn 3 // 每行显示数量
 #define MaxImageCount 9 // 最多显示图片个数
 #define deleImageWH 25 // 删除按钮的宽高
 #define kAdeleImage @"close.png" // 删除按钮图片
 #define kAddImage @"add.png" // 添加按钮图片

 #import "SZAddImage.h"
 @interface SZAddImage()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
 {
     // 标识被编辑的按钮 -1 为添加新的按钮
     NSInteger editTag;
 }
 @end

 @implementation SZAddImage

 - (id)initWithFrame:(CGRect)frame
 {
     self = [super initWithFrame:frame];
     if (self) {
         UIButton *btn = [self createButtonWithImage:kAddImage andSeletor:@selector(addNew:)];
         [self addSubview:btn];
     }
     return self;
 }

 -(NSMutableArray *)images
 {
     if (_images == nil) {
         _images = [NSMutableArray array];
     }
     return _images;
 }

 // 添加新的控件
 - (void)addNew:(UIButton *)btn
 {
     // 标识为添加一个新的图片

     if (![self deleClose:btn]) {
         editTag = -;
         [self callImagePicker];
     }

 }

 // 修改旧的控件
 - (void)changeOld:(UIButton *)btn
 {
     // 标识为修改(tag为修改标识)
     if (![self deleClose:btn]) {
         editTag = btn.tag;
         [self callImagePicker];
     }
 }

 // 删除"删除按钮"
 - (BOOL)deleClose:(UIButton *)btn
 {
     if (btn.subviews.count == ) {
         [[btn.subviews lastObject] removeFromSuperview];
         [self stop:btn];
         return YES;
     }

     return NO;
 }

 // 调用图片选择器
 - (void)callImagePicker
 {
     UIImagePickerController *pc = [[UIImagePickerController alloc] init];
     pc.allowsEditing = YES;
     pc.delegate = self;
     [self.window.rootViewController presentViewController:pc animated:YES completion:nil];
 }

 // 根据图片名称或者图片创建一个新的显示控件
 - (UIButton *)createButtonWithImage:(id)imageNameOrImage andSeletor : (SEL)selector
 {
     UIImage *addImage = nil;
     if ([imageNameOrImage isKindOfClass:[NSString class]]) {
        addImage = [UIImage imageNamed:imageNameOrImage];
     }
     else if([imageNameOrImage isKindOfClass:[UIImage class]])
     {
         addImage = imageNameOrImage;
     }
     UIButton *addBtn = [UIButton buttonWithType:UIButtonTypeCustom];
     [addBtn setImage:addImage forState:UIControlStateNormal];
     [addBtn addTarget:self action:selector forControlEvents:UIControlEventTouchUpInside];
     addBtn.tag = self.subviews.count;

     // 添加长按手势,用作删除.加号按钮不添加
     if(addBtn.tag != )
     {
     UILongPressGestureRecognizer *gester = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
     [addBtn addGestureRecognizer:gester];
     }
     return addBtn;

 }

 // 长按添加删除按钮
 - (void)longPress : (UIGestureRecognizer *)gester
 {
     if (gester.state == UIGestureRecognizerStateBegan)
     {
     UIButton *btn = (UIButton *)gester.view;

     UIButton *dele = [UIButton buttonWithType:UIButtonTypeCustom];
     dele.bounds = CGRectMake(, , deleImageWH, deleImageWH);
     [dele setImage:[UIImage imageNamed:kAdeleImage] forState:UIControlStateNormal];
     [dele addTarget:self action:@selector(deletePic:) forControlEvents:UIControlEventTouchUpInside];
     dele.frame = CGRectMake(btn.frame.size.width - dele.frame.size.width, , dele.frame.size.width, dele.frame.size.height);

     [btn addSubview:dele];
     [self start : btn];

     }

 }

 // 长按开始抖动
 - (void)start : (UIButton *)btn {
     double angle1 = -5.0 / 180.0 * M_PI;
     double angle2 = 5.0 / 180.0 * M_PI;
     CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
     anim.keyPath = @"transform.rotation";

     anim.values = @[@(angle1),  @(angle2), @(angle1)];
     anim.duration = 0.25;
     // 动画的重复执行次数
     anim.repeatCount = MAXFLOAT;

     // 保持动画执行完毕后的状态
     anim.removedOnCompletion = NO;
     anim.fillMode = kCAFillModeForwards;

     [btn.layer addAnimation:anim forKey:@"shake"];
 }

 // 停止抖动
 - (void)stop : (UIButton *)btn{
     [btn.layer removeAnimationForKey:@"shake"];
 }

 // 删除图片
 - (void)deletePic : (UIButton *)btn
 {
     [self.images removeObject:[(UIButton *)btn.superview imageForState:UIControlStateNormal]];
     [btn.superview removeFromSuperview];
     if ([[self.subviews lastObject] isHidden]) {
         [[self.subviews lastObject] setHidden:NO];
     }

 }

 // 对所有子控件进行布局
 - (void)layoutSubviews
 {
     [super layoutSubviews];
     int count = self.subviews.count;
     CGFloat btnW = imageW;
     CGFloat btnH = imageH;
     int maxColumn = kMaxColumn > self.frame.size.width / imageW ? self.frame.size.width / imageW : kMaxColumn;
     CGFloat marginX = (self.frame.size.width - maxColumn * btnW) / (count + );
     CGFloat marginY = marginX;
     for (int i = ; i < count; i++) {
         UIButton *btn = self.subviews[i];
         CGFloat btnX = (i % maxColumn) * (marginX + btnW) + marginX;
         CGFloat btnY = (i / maxColumn) * (marginY + btnH) + marginY;
         btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
     }

 }

 #pragma mark - UIImagePickerController 代理方法
 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
 {
     UIImage *image = info[UIImagePickerControllerEditedImage];
     if (editTag == -) {
         // 创建一个新的控件
         UIButton *btn = [self createButtonWithImage:image andSeletor:@selector(changeOld:)];
         [self insertSubview:btn atIndex:self.subviews.count - ];
         [self.images addObject:image];
         if (self.subviews.count -  == MaxImageCount) {
             [[self.subviews lastObject] setHidden:YES];

         }
     }
     else
     {
         // 根据tag修改需要编辑的控件
         UIButton *btn = (UIButton *)[self viewWithTag:editTag];
         int index = [self.images indexOfObject:[btn imageForState:UIControlStateNormal]];
         [self.images removeObjectAtIndex:index];
         [btn setImage:image forState:UIControlStateNormal];
         [self.images insertObject:image atIndex:index];
     }
     // 退出图片选择控制器
     [picker dismissViewControllerAnimated:YES completion:nil];
 }

 @end