九宫格图片选择器

首先，涉及访问相册权限：
需在“plist”文件里，输入如下代码！！

<!-- 相册 -->
<key>NSPhotoLibraryUsageDescription</key>
<string>APP需要您的同意,才能访问相册</string> <!-- 描述字符串 ⭐️可随意填，但必须填 -->

初次使用：

创建九宫格图片选择器视图：SudokuAddImageView

在“SudokuAddImageView.h”文件：

#import <UIKit/UIKit.h>

@interface SudokuAddImageView : UIView

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

/**  选择照片是否有编辑框 */
@property (nonatomic,assign) BOOL allowEdit;

@end  

在“SudokuAddImageView.m”文件：

#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width) //屏宽

#define imageH (SCREEN_WIDTH*210.f/750.f) // 图片高度
#define imageW (SCREEN_WIDTH*210.f/750.f) // 图片宽度
#define deleImageWH (SCREEN_WIDTH*35.f/750.f) // 删除按钮的宽高

#define kMaxColumn 3 // 每行显示数量
#define MaxImageCount 9 // 最多显示图片个数
#define kAdeleImage @"ic_not_pass" // 删除按钮图片
#define kAddImage @"pic_upload_forTotalBtn" // 添加按钮图片


@interface SudokuAddImageView () <UIImagePickerControllerDelegate>
{
    //标识被编辑的按钮 -1 为添加新的按钮
    NSInteger editTag;
}

@end



@implementation SudokuAddImageView

- (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 = -1;
        [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];
    }
}

// 移除"删除按钮"
- (BOOL)deleClose:(UIButton *)btn
{
    if (btn.subviews.count == 2) {
        [[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 = _allowEdit?_allowEdit:NO;
    pc.delegate = self;
    [self.window.rootViewController presentViewController:pc animated:YES completion:nil];
}

// 根据图片名称或者图片对象 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
    if(addBtn.tag != 0) {
        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(0, 0, 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, 0, 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];
    NSInteger 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 + 1);
    CGFloat marginY = marginX;
    for (int i = 0; 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 - UIImagePickerControllerDelegate
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image;
    if (_allowEdit == YES) { //可编辑
        image = info[UIImagePickerControllerEditedImage];       //编辑后的图片
    } else { //不可编辑
        image = info[UIImagePickerControllerOriginalImage];     //原始的图片
    }

    if (editTag == -1) {
       // 创建一个新的控件
       UIButton *btn = [self createButtonWithImage:image andSeletor:@selector(changeOld:)];
       [self insertSubview:btn atIndex:self.subviews.count - 1];
       [self.images addObject:image];
       if (self.subviews.count - 1 == 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];
        NSInteger 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];
}

---

使用

在ViewController里：

包含头文件：#import "SudokuAddImageView.h" //头文件

SudokuAddImageView * addImg_V = [[SudokuAddImageView alloc] init];
//addImg_V.allowEdit = YES; //是否可编辑(含编辑框)
addImg_V.frame = CGRectMake(0, 20, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.width);
[self.view addSubview:addImg_V];

效果：

当然删除按钮，根据需求添加！！我使用的是长按手势！
之前的需求是在界面点击图片后，可选择更换，还是删除当前图片！

代码地址：https://github.com/Goyohol/FunctionRealize/tree/master/SukodePicturePicker

goyohol's essay