iOS8中添加的extensions總結（三）——圖片編輯擴展

• 圖片編輯擴展

 

注：此教程來源於http://www.raywenderlich.com的《iOS8 by Tutorials》

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1.準備

與（二）相似的使用Imgur做爲圖片來源

 

2.正文

添加Photo Editing Extension

以後在新生成的文件夾下找到MainInterface.storyboard爲PhotoEditingViewController加上Size Classes，在這裏我刪掉原來的vc，加入新的vc，並設置它爲啓動界面，具體設置見我提供的源碼中的storyboard文件，這裏只具體寫寫它的實現類PhotoEditingViewController的使用方法。

還要注意的一點是：因爲在新工程中要使用RWTImageFilterService.h，因此要在下面添加它的實現.m文件，不然會報錯！！！

下面是PhotoEditingViewController.m代碼，附有個人一些註釋說明

 

  1 //
  2 //  PhotoEditingViewController.m
  3 //  JMImgure Photo
  4 //
  5 //  Created by JackMa on 15/12/3.
  6 //  Copyright © 2015年 JackMa. All rights reserved.
  7 //
  8 
  9 #import "PhotoEditingViewController.h"
 10 #import <Photos/Photos.h>
 11 #import <PhotosUI/PhotosUI.h>
 12 #import "RWTImageFilterService.h"
 13 
 14 @interface PhotoEditingViewController () <PHContentEditingController>
 15 
 16 @property (strong) PHContentEditingInput *input;
 17 
 18 @property (nonatomic, weak) IBOutlet UIImageView *imageView;
 19 @property (nonatomic, weak) IBOutlet UIButton *undoButton;
 20 @property (nonatomic, weak) IBOutlet UIButton *addButton;
 21 
 22 @property (strong, nonatomic) RWTImageFilterService *imageFilterService;
 23 @property (strong, nonatomic) NSString *currentFilterName;
 24 @property (strong, nonatomic) UIImage *filteredImage;
 25 
 26 @end
 27 
 28 @implementation PhotoEditingViewController
 29 
 30 //撤銷的button
 31 - (IBAction)undo:(id)sender {
 32   self.imageView.image = self.input.displaySizeImage;
 33   self.currentFilterName = nil;
 34   self.filteredImage = nil;
 35 }
 36 
 37 //添加過濾器
 38 - (IBAction)addFilter:(id)sender {
 39   UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"過濾器" message:@"請選擇一種過濾器" preferredStyle:UIAlertControllerStyleActionSheet];
 40   //遍歷字典
 41   [self.imageFilterService.availableFilters enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
 42     UIAlertAction *action = [UIAlertAction actionWithTitle:key style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
 43       //爲圖片添加過濾
 44       self.filteredImage = [self.imageFilterService applyFilter:obj toImage:self.input.displaySizeImage];
 45       self.imageView.image = self.filteredImage;
 46       self.currentFilterName = obj;
 47     }];
 48     [alert addAction:action];
 49   }];
 50   UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
 51     [alert dismissViewControllerAnimated:YES completion:nil];
 52   }];
 53   [alert addAction:cancel];
 54   [self presentViewController:alert animated:YES completion:nil];
 55 }
 56 
 57 - (void)viewDidLoad {
 58   [super viewDidLoad];
 59   
 60   self.imageView.contentMode = UIViewContentModeScaleAspectFit;
 61   self.imageFilterService = [[RWTImageFilterService alloc] init];
 62 }
 63 
 64 - (void)didReceiveMemoryWarning {
 65     [super didReceiveMemoryWarning];
 66     // Dispose of any resources that can be recreated.
 67 }
 68 
 69 #pragma mark - PHContentEditingController
 70 
 71 //在原始編輯界面能夠對圖片進行調整，當你在這個App想獲取的是最原始的圖片，那麼返回NO
 72 //你想獲取調整後的adjustmentData的話，那麼返回YES
 73 //只有圖片通過調整纔會調用此函數，不然默認NO
 74 - (BOOL)canHandleAdjustmentData:(PHAdjustmentData *)adjustmentData {
 75   return NO;
 76 }
 77 
 78 //view Load後，view appear前調用，用來接受原始數據contentEditingInput
 79 - (void)startContentEditingWithInput:(PHContentEditingInput *)contentEditingInput placeholderImage:(UIImage *)placeholderImage {
 80   //canHandleAdjustmentData:返回YES的話，這裏的contentEditingInput也會帶上adjustmentData
 81   //canHandleAdjustmentData:返回NO的話，這裏只有原始圖像displaySizeImage
 82   self.input = contentEditingInput;
 83   self.imageView.image = self.input.displaySizeImage;//將原始圖片呈現出來
 84 }
 85 
 86 //點擊右上方完成button時調用
 87 - (void)finishContentEditingWithCompletionHandler:(void (^)(PHContentEditingOutput *))completionHandler {
 88   //異步處理圖片
 89     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
 90       //建立output並設置
 91       PHContentEditingOutput *output = [[PHContentEditingOutput alloc] initWithContentEditingInput:self.input];
 92       NSData *archiveData = [NSKeyedArchiver archivedDataWithRootObject:self.currentFilterName];
 93 #warning Please set your Photos Extension Name and Version here
 94       PHAdjustmentData *adjustmentData = [[PHAdjustmentData alloc] initWithFormatIdentifier:@"qq100858433.JMImgure.JMImgure-Photo" formatVersion:@"1.0" data:archiveData];
 95       output.adjustmentData = adjustmentData;
 96       
 97       UIImage *fullImage = [UIImage imageWithContentsOfFile:self.input.fullSizeImageURL.path];
 98       fullImage = [self.imageFilterService applyFilter:self.currentFilterName toImage:fullImage];
 99       
100       //將轉化後的圖片存到renderedContentURL中
101       NSData *jpegData = UIImageJPEGRepresentation(fullImage, 1.0);
102       BOOL saved = [jpegData writeToURL:output.renderedContentURL options:NSDataWritingAtomic error:nil];
103       if (saved) {
104         //回調處理結果給Photos
105         //注：這裏模擬機調試會出現沒法顯示修改後圖片問題，真機調試沒有問題
106         completionHandler(output);
107       } else {
108         NSLog(@"An error occurred during save");
109         completionHandler(nil);
110       }
111       // Clean up temporary files, etc.
112     });
113 }
114 
115 //點擊左上方取消後調用
116 - (BOOL)shouldShowCancelConfirmation {
117   //返回YES，則會彈出AlertSheet讓用戶確認是否取消
118   //返回NO，則頁面直接消失
119   return NO;
120 }
121 
122 //shouldShowCancelConfirmation或finishContentEditingWithCompletionHandler:
123 //以後調用，此函數在後臺運行，負責清理臨時文件
124 - (void)cancelContentEditing {
125     // Clean up temporary files, etc.
126     // May be called after finishContentEditingWithCompletionHandler: while you prepare output.
127 }
128 
129 @end

最後的說明：

在新建Photo Extension Target時，系統默認是隻爲圖片添加擴展效果，那麼視頻呢

你能夠在PHSupportedMediaTypes中修改你想支持的媒體類型

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源碼點擊 包括未添加擴展的 original版本和修改後版本