一個iOS圖片選取器的DEMO(實現圖片添加，宮格排列，圖片長按刪除，以及圖片替換等功能)

　　在開發中，經常用到選擇多張圖片進行上傳或作其他處理等等，以下DEMO滿足了此功能中的大部分功能，可直接使用到項目中。

主要功能如下：

　　1，圖片九宮格排列（可自動化佈建）

　　2，圖片長按抖動（仿蘋果軟體刪除時，表徵圖抖動效果），可進入刪除狀態，再次單擊進入普通狀態

　　3，圖片設定最大上限，加號按鈕自動隱藏

　　4，已選圖片可單擊進行重新選擇

　　5，無需代理，直接調用對應屬性就可擷取所有圖片，並與顯示順序保持一致

　　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  * 使用說明:直接建立此view添加到你需要放置的位置即可.11  * 屬性images可以擷取到當前選中的所有圖片對象.12  */13 14 #import <UIKit/UIKit.h>15 16 @interface SZAddImage : UIView17 18 /**19  *  儲存所有的照片(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 // 圖片高度 10 #define imageW 75 // 圖片寬度 11 #define kMaxColumn 3 // 每行顯示數量 12 #define MaxImageCount 9 // 最多顯示圖片個數 13 #define deleImageWH 25 // 刪除按鈕的寬高 14 #define kAdeleImage @"close.png" // 刪除按鈕圖片 15 #define kAddImage @"add.png" // 添加按鈕圖片 16  17  18  19 #import "SZAddImage.h" 20 @interface SZAddImage()<UINavigationControllerDelegate, UIImagePickerControllerDelegate> 21 { 22     // 標識被編輯的按鈕 -1 為添加新的按鈕 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 // 添加新的控制項 48 - (void)addNew:(UIButton *)btn 49 { 50     // 標識為添加一個新的圖片 51      52     if (![self deleClose:btn]) { 53         editTag = -1; 54         [self callImagePicker]; 55     } 56     57      58 } 59  60 // 修改舊的控制項 61 - (void)changeOld:(UIButton *)btn 62 { 63     // 標識為修改(tag為修改標識) 64     if (![self deleClose:btn]) { 65         editTag = btn.tag; 66         [self callImagePicker]; 67     } 68 } 69  70 // 刪除"刪除按鈕" 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 // 調用圖片選取器 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 // 根據圖片名稱或者圖片建立一個新的顯示控制項 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     // 添加長按手勢,用作刪除.加號按鈕不添加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 // 長按添加刪除按鈕120 - (void)longPress : (UIGestureRecognizer *)gester121 {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 // 長按開始抖動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     // 動畫的重複執行次數150     anim.repeatCount = MAXFLOAT;151     152     // 保持動畫執行完畢後的狀態153     anim.removedOnCompletion = NO;154     anim.fillMode = kCAFillModeForwards;155     156     [btn.layer addAnimation:anim forKey:@"shake"];157 }158 159 // 停止抖動160 - (void)stop : (UIButton *)btn{161     [btn.layer removeAnimationForKey:@"shake"];162 }163 164 // 刪除圖片165 - (void)deletePic : (UIButton *)btn166 {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 // 對所有子控制項進行布局177 - (void)layoutSubviews178 {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 *)info197 {198     UIImage *image = info[UIImagePickerControllerEditedImage];199     if (editTag == -1) {200         // 建立一個新的控制項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     else210     {211         // 根據tag修改需要編輯的控制項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     // 退出圖片選擇控制器219     [picker dismissViewControllerAnimated:YES completion:nil];220 }221 222 223 224 @end