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"]; [_snsArray addObject:_RenrenSwitch.isOn"]; [_snsArray addObject:_DoubanSwitch.isOn"]; 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
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
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