iOS开发-仿微信图片分享界面实现

分享功能目前几乎已成为很多app的标配了，其中微信，微博等app的图片分享界面设计的很棒，不仅能够展示缩略图，还可以预览删除。最近我在做一款社交分享app，其中就要实现图文分享功能，于是试着自行实现仿微信分享风格的功能。

核心思想：

主要是使用UICollectionView来动态加载分享图片内容，配合预览页面，实现动态添加和预览删除图片效果。

实现效果：

核心代码如下：

分享界面：

//
//  PostTableViewController.h
//  NineShare
//
//  Created by 张昌伟 on 15/1/26.
//  Copyright (c) 2015年 9Studio. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "UMSocial.h"
#import "YSYPreviewViewController.h"

@interface PostTableViewController : UITableViewController<UITextViewDelegate,UICollectionViewDataSource,UICollectionViewDelegate,UIActionSheetDelegate,UIImagePickerControllerDelegate,UMSocialUIDelegate,UINavigationControllerDelegate>

@property (weak, nonatomic) IBOutlet UICollectionView *photosCollectionView;
@property (weak, nonatomic) IBOutlet UISwitch *WeiboSwitch;
@property (weak, nonatomic) IBOutlet UISwitch *RenrenSwitch;
- (IBAction)DoubanSwitched:(id)sender;
- (IBAction)RenrenSwitched:(id)sender;
- (IBAction)WeiboSwitched:(id)sender;

+(void) deleteSelectedImage:(NSInteger) index;
+(void) deleteSelectedImageWithImage:(UIImage*)image;
@end

实现文件

//
//  PostTableViewController.m
//  NineShare
//
//  Created by 张昌伟 on 15/1/26.
//  Copyright (c) 2015年 9Studio. All rights reserved.
//

#import "PostTableViewController.h"
#import "NineShareService.h"
static NSMutableArray *currentImages;
@interface PostTableViewController ()
@property (weak, nonatomic) IBOutlet UITextView *shareContent;
- (IBAction)postStatus:(id)sender;
- (IBAction)cancelPost:(id)sender;
-(void) loadSNSStatus;
@property (weak, nonatomic) IBOutlet UISwitch *DoubanSwitch;
@property (weak, nonatomic) IBOutlet UITextView *backgroundTextView;
@property NSMutableArray *snsArray;
//@property NSMutableArray *photos;
@property NineShareService *dataContext;
@property NSMutableDictionary *tempDict;

-(void) openCamera;
-(void) openLibary;

@end

@implementation PostTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    if(currentImages ==nil)
    {
        currentImages=[[NSMutableArray alloc] init];
    }
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    _dataContext=[NineShareService getInstance];
    [self loadSNSStatus];
}
-(void)viewWillAppear:(BOOL)animated{
    [_photosCollectionView reloadData];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void) loadSNSStatus{
    _snsArray=[NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"sns" ofType:@"plist"]];
    if(_snsArray.count>0)
    {
        [_WeiboSwitch setOn:[_snsArray[0] boolValue] animated:YES];
        [_RenrenSwitch setOn:[_snsArray[1] boolValue] animated:YES];
        [_DoubanSwitch setOn:[_snsArray[2] boolValue] animated:YES];
    }
}
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
    if(![text isEqualToString:@""])
    {
        [_backgroundTextView setHidden:YES];
    }
    if([text isEqualToString:@""]&&range.length==1&&range.location==0){
        [_backgroundTextView setHidden:NO];
    }
    if ([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }
    return YES;
}
-(void)textViewDidBeginEditing:(UITextView *)textView
{
    CGRect frame = textView.frame;
    int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//键盘高度216

    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];

    //将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示
    if(offset > 0)
        self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);

    [UIView commitAnimations];
}

-(void)textViewDidEndEditing:(UITextView *)textView{
    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    if(indexPath.row==currentImages.count)
    {
        UIActionSheet *action=[[UIActionSheet alloc] initWithTitle:@"选取照片" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从摄像头选取", @"从图片库选择",nil];
        [action showInView:self.view];
    }
    else
    {
        [YSYPreviewViewController setPreviewImage:currentImages[indexPath.row]];
        [self.navigationController pushViewController:[[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"PreviewVC"] animated:YES];
    }
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return currentImages.count==0?1:currentImages.count+1;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"collectionCell" forIndexPath:indexPath];
    UIImageView *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    if(currentImages.count==0||indexPath.row==currentImages.count)
    {
        imageView.image=[UIImage imageNamed:@"Add"];
    }
    else{

        while ([cell.contentView.subviews lastObject] != nil) {
            [(UIView*)[cell.contentView.subviews lastObject] removeFromSuperview];
        }
        imageView.image=currentImages[indexPath.row];
    }

    imageView.contentMode=UIViewContentModeScaleAspectFill;
    [cell.contentView addSubview:imageView];
    return  cell;
}

-(void)saveSNSToFile{
    NSString *destPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    if (![[NSFileManager defaultManager] fileExistsAtPath:destPath]) {
         NSString *path=[[NSBundle mainBundle] pathForResource:@"sns" ofType:@"plist"];
        [[NSFileManager defaultManager] copyItemAtPath:path toPath:destPath error:nil];
    }

    if(_snsArray==nil)
        _snsArray=[[NSMutableArray alloc] init];
    [_snsArray removeAllObjects];
    [_snsArray addObject:_WeiboSwitch.isOn?@"YES":@"NO"];
    [_snsArray addObject:_RenrenSwitch.isOn?@"YES":@"NO"];
    [_snsArray addObject:_DoubanSwitch.isOn?@"YES":@"NO"];
    if(_snsArray.count>0)
    {
        [_snsArray writeToFile:destPath atomically:YES];
    }
}

- (IBAction)postStatus:(id)sender {
    if(_WeiboSwitch.isOn)
        [[UMSocialDataService defaultDataService]  postSNSWithTypes:@[UMShareToSina] content:_shareContent.text.length>0?_shareContent.text: @"9Share for ios test message" image:currentImages.count==0?nil:currentImages[0] location:nil urlResource:nil presentedController:self completion:^(UMSocialResponseEntity *response){
            if (response.responseCode == UMSResponseCodeSuccess) {
                NSLog(@"分享成功！");
                if(!(_RenrenSwitch.isOn||_DoubanSwitch.isOn))
                {
                    [self saveSNSToFile];
                    [self dismissViewControllerAnimated:YES completion:nil];
                }
            }
        }];
    if(_RenrenSwitch.isOn)
        [[UMSocialDataService defaultDataService]  postSNSWithTypes:@[UMShareToRenren] content:_shareContent.text.length>0?_shareContent.text: @"9Share for ios test message" image:currentImages.count==0?nil:currentImages[0] location:nil urlResource:nil presentedController:self completion:^(UMSocialResponseEntity *response){
            if (response.responseCode == UMSResponseCodeSuccess) {
                NSLog(@"分享成功！");
                if(!_DoubanSwitch.isOn)
                {
                    [self saveSNSToFile];
                    [self dismissViewControllerAnimated:YES completion:nil];
                }
            }
        }];
    if(_DoubanSwitch.isOn)
        [[UMSocialDataService defaultDataService]  postSNSWithTypes:@[UMShareToDouban] content:_shareContent.text.length>0?_shareContent.text: @"9Share for ios test message" image:currentImages.count==0?nil:currentImages[0] location:nil urlResource:nil presentedController:self completion:^(UMSocialResponseEntity *response){
            if (response.responseCode == UMSResponseCodeSuccess) {
                NSLog(@"分享成功！");
                [self saveSNSToFile];
                [self dismissViewControllerAnimated:YES completion:nil];
            }
        }];

}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    [picker dismissViewControllerAnimated:YES completion:nil];
    UIImage *image=[info objectForKey:UIImagePickerControllerOriginalImage];
    NSData *tempData=UIImageJPEGRepresentation(image, 0.5f);
    image=[UIImage imageWithData:tempData];
    if(currentImages ==nil)
    {
        currentImages=[[NSMutableArray alloc] init];
    }
    [currentImages addObject:image];
    [_photosCollectionView reloadData];
   // [self saveImage:image withName:@""]
}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (IBAction)cancelPost:(id)sender {
    [self dismissViewControllerAnimated:YES completion:nil];
}

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

    switch (buttonIndex) {
        case 0:
            [self openCamera];
            break;
        case 1:
            [self openLibary];
            break;
            default:
            break;
    }
}
-(void)openCamera{
    //UIImagePickerControllerSourceType *type=UIImagePickerControllerSourceTypeCamera;
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
       {
           UIImagePickerController *picker=[[UIImagePickerController alloc] init];
           picker.delegate=self;
           picker.sourceType=UIImagePickerControllerSourceTypeCamera;
           picker.allowsEditing=YES;
           [self presentViewController:picker animated:YES completion:nil];

       }
}
-(void)openLibary{
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
    {
        UIImagePickerController *picker=[[UIImagePickerController alloc] init];
        picker.delegate=self;
        picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
        picker.allowsEditing=YES;
        [self presentViewController:picker animated:YES completion:nil];

    }

}
-(void) saveImage:(UIImage *)image withName:(NSString *)name
{
    NSData *imageData=UIImageJPEGRepresentation(image, 0.5);
    NSString *path=[NSTemporaryDirectory() stringByAppendingPathComponent:name];
    [imageData writeToFile:path atomically:YES];

}
- (IBAction)DoubanSwitched:(id)sender {
    if(_DoubanSwitch.isOn){
        if(![UMSocialAccountManager isOauthAndTokenNotExpired:UMShareToDouban])
        {
            //进入授权页面
            [UMSocialSnsPlatformManager getSocialPlatformWithName:UMShareToDouban].loginClickHandler(self,[UMSocialControllerService defaultControllerService],YES,^(UMSocialResponseEntity *response){
                if (response.responseCode == UMSResponseCodeSuccess) {
                    //获取微博用户名、uid、token等
                    UMSocialAccountEntity *snsAccount = [[UMSocialAccountManager socialAccountDictionary] valueForKey:UMShareToDouban];
                    NSLog(@"username is %@, uid is %@, token is %@",snsAccount.userName,snsAccount.usid,snsAccount.accessToken);
                    //进入你的分享内容编辑页面
                    UMSocialAccountEntity *doubanAccount = [[UMSocialAccountEntity alloc] initWithPlatformName:UMShareToDouban];
                    doubanAccount.usid = snsAccount.usid;
                    doubanAccount.accessToken = snsAccount.accessToken;
                    //    weiboAccount.openId = @"tencent weibo openId";          //腾讯微博账户必需设置openId
                    //同步用户信息
                    [UMSocialAccountManager postSnsAccount:doubanAccount completion:^(UMSocialResponseEntity *response){
                        if (response.responseCode == UMSResponseCodeSuccess) {
                            //在本地缓存设置得到的账户信息
                            [UMSocialAccountManager setSnsAccount:doubanAccount];
                            //进入你自定义的分享内容编辑页面或者使用我们的内容编辑页面
                        }}];
                }
                else {
                    [_DoubanSwitch setOn:NO animated:YES];
                }
            });
        }
    }
}

- (IBAction)RenrenSwitched:(id)sender {
    if(_DoubanSwitch.isOn)
    {
        if(![UMSocialAccountManager isOauthAndTokenNotExpired:UMShareToRenren])
        {
            //进入授权页面
            [UMSocialSnsPlatformManager getSocialPlatformWithName:UMShareToRenren].loginClickHandler(self,[UMSocialControllerService defaultControllerService],YES,^(UMSocialResponseEntity *response){
                if (response.responseCode == UMSResponseCodeSuccess) {
                    //获取微博用户名、uid、token等
                    UMSocialAccountEntity *snsAccount = [[UMSocialAccountManager socialAccountDictionary] valueForKey:UMShareToRenren];
                    NSLog(@"username is %@, uid is %@, token is %@",snsAccount.userName,snsAccount.usid,snsAccount.accessToken);
                    //进入你的分享内容编辑页面
                    UMSocialAccountEntity *renrenAccount = [[UMSocialAccountEntity alloc] initWithPlatformName:UMShareToRenren];
                    renrenAccount.usid = snsAccount.usid;
                    renrenAccount.accessToken = snsAccount.accessToken;
                    //    weiboAccount.openId = @"tencent weibo openId";          //腾讯微博账户必需设置openId
                    //同步用户信息
                    [UMSocialAccountManager postSnsAccount:renrenAccount completion:^(UMSocialResponseEntity *response){
                        if (response.responseCode == UMSResponseCodeSuccess) {
                            //在本地缓存设置得到的账户信息
                            [UMSocialAccountManager setSnsAccount:renrenAccount];
                            //进入你自定义的分享内容编辑页面或者使用我们的内容编辑页面
                        }}];
                }
                else{
                    [_RenrenSwitch setOn:NO animated:YES];
                }
            });
        }

    }
}

- (IBAction)WeiboSwitched:(id)sender {
    if(_WeiboSwitch.isOn)
    {
        if(![UMSocialAccountManager isOauthAndTokenNotExpired:UMShareToSina])
        {
            [UMSocialSnsPlatformManager getSocialPlatformWithName:UMShareToSina].loginClickHandler(self,[UMSocialControllerService defaultControllerService],YES,^(UMSocialResponseEntity *response){
                if(response.responseCode==UMSResponseCodeSuccess){
                    UMSocialAccountEntity *snsAccount=[[UMSocialAccountManager socialAccountDictionary] valueForKey:UMShareToSina];
                    UMSocialAccountEntity *sinaAccount=[[UMSocialAccountEntity alloc] initWithPlatformName:UMShareToSina];
                    //缓存到本地
                    sinaAccount.usid = snsAccount.usid;
                    sinaAccount.accessToken = snsAccount.accessToken;
                    //    weiboAccount.openId = @"tencent weibo openId";          //腾讯微博账户必需设置openId
                    //同步用户信息
                    [UMSocialAccountManager postSnsAccount:sinaAccount completion:^(UMSocialResponseEntity *response){
                        if (response.responseCode == UMSResponseCodeSuccess) {
                            //在本地缓存设置得到的账户信息
                            [UMSocialAccountManager setSnsAccount:sinaAccount];
                            //进入你自定义的分享内容编辑页面或者使用我们的内容编辑页面
                        }}];

                }
                else
                {
                    [_WeiboSwitch setOn:NO animated:YES];
                }
            });
        }
    }
}

+(void)deleteSelectedImage:(NSInteger)index
{
    if(currentImages!=nil)
        [currentImages removeObjectAtIndex:index];
}
+(void)deleteSelectedImageWithImage:(UIImage *)image{
    if(currentImages!=nil)
        [currentImages removeObject:image];

}
@end

预览界面：

//
//  YSYPreviewViewController.h
//  NineShare
//
//  Created by ZhangChangwei on 15/2/1.
//  Copyright (c) 2015年 9Studio. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "PostTableViewController.h"

@interface YSYPreviewViewController : UIViewController<UIActionSheetDelegate>
+(void) setPreviewImage:(UIImage *)image;
@end

//
//  YSYPreviewViewController.m
//  NineShare
//
//  Created by ZhangChangwei on 15/2/1.
//  Copyright (c) 2015年 9Studio. All rights reserved.
//

#import "YSYPreviewViewController.h"
static UIImage *currentImage;
@interface YSYPreviewViewController ()
- (IBAction)deleteSelectedImage:(id)sender;
@property (weak, nonatomic) IBOutlet UIImageView *previewImageView;

@end

@implementation YSYPreviewViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    _previewImageView.image=currentImage;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (IBAction)deleteSelectedImage:(id)sender {
    UIActionSheet *action=[[UIActionSheet alloc] initWithTitle:@"要删除这张照片吗？" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"删除" otherButtonTitles: nil];
    [action showInView:self.view];
}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex==actionSheet.cancelButtonIndex)
    {
        return;
    }
    else
    {
        [PostTableViewController deleteSelectedImageWithImage:currentImage];
        [self.navigationController popToRootViewControllerAnimated:YES];
    }
}

+(void)setPreviewImage:(UIImage *)image{
    currentImage=image;
}
@end

到这里就可以实现完整的带预览删除的图文分享功能了^_^