iOS8中添加的extensions总结（三）——图片编辑扩展

• 图片编辑扩展

注：此教程来源于http://www.raywenderlich.com的《iOS8 by Tutorials》

---

1.准备

与（二）类似的使用Imgur作为图片来源

 

2.正文

添加Photo Editing Extension

之后在新生成的文件夹下找到MainInterface.storyboard为PhotoEditingViewController加上Size Classes，在这里我删掉原来的vc，加入新的vc，并设置它为启动界面，具体设置见我提供的源码中的storyboard文件，这里只具体写写它的实现类PhotoEditingViewController的使用方法。

还要注意的一点是：由于在新工程中要使用RWTImageFilterService.h，所以要在下面添加它的实现.m文件，否则会报错！！！

下面是PhotoEditingViewController.m代码，附有我的一些注释说明

 

 //
 //  PhotoEditingViewController.m
 //  JMImgure Photo
 //
 //  Created by JackMa on 15/12/3.
 //  Copyright © 2015年 JackMa. All rights reserved.
 //

 #import "PhotoEditingViewController.h"
 #import <Photos/Photos.h>
 #import <PhotosUI/PhotosUI.h>
 #import "RWTImageFilterService.h"

 @interface PhotoEditingViewController () <PHContentEditingController>

 @property (strong) PHContentEditingInput *input;

 @property (nonatomic, weak) IBOutlet UIImageView *imageView;
 @property (nonatomic, weak) IBOutlet UIButton *undoButton;
 @property (nonatomic, weak) IBOutlet UIButton *addButton;

 @property (strong, nonatomic) RWTImageFilterService *imageFilterService;
 @property (strong, nonatomic) NSString *currentFilterName;
 @property (strong, nonatomic) UIImage *filteredImage;

 @end

 @implementation PhotoEditingViewController

 //撤销的button
 - (IBAction)undo:(id)sender {
   self.imageView.image = self.input.displaySizeImage;
   self.currentFilterName = nil;
   self.filteredImage = nil;
 }

 //添加过滤器
 - (IBAction)addFilter:(id)sender {
   UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"过滤器" message:@"请选择一种过滤器" preferredStyle:UIAlertControllerStyleActionSheet];
   //遍历字典
   [self.imageFilterService.availableFilters enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
     UIAlertAction *action = [UIAlertAction actionWithTitle:key style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
       //为图片添加过滤
       self.filteredImage = [self.imageFilterService applyFilter:obj toImage:self.input.displaySizeImage];
       self.imageView.image = self.filteredImage;
       self.currentFilterName = obj;
     }];
     [alert addAction:action];
   }];
   UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
     [alert dismissViewControllerAnimated:YES completion:nil];
   }];
   [alert addAction:cancel];
   [self presentViewController:alert animated:YES completion:nil];
 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   self.imageView.contentMode = UIViewContentModeScaleAspectFit;
   self.imageFilterService = [[RWTImageFilterService alloc] init];
 }

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

 #pragma mark - PHContentEditingController

 //在原始编辑界面可以对图片进行调整，当你在这个App想获取的是最原始的图片，那么返回NO
 //你想获取调整后的adjustmentData的话，那么返回YES
 //只有图片经过调整才会调用此函数，否则默认NO
 - (BOOL)canHandleAdjustmentData:(PHAdjustmentData *)adjustmentData {
   return NO;
 }

 //view Load后，view appear前调用，用来接受原始数据contentEditingInput
 - (void)startContentEditingWithInput:(PHContentEditingInput *)contentEditingInput placeholderImage:(UIImage *)placeholderImage {
   //canHandleAdjustmentData:返回YES的话，这里的contentEditingInput也会带上adjustmentData
   //canHandleAdjustmentData:返回NO的话，这里只有原始图像displaySizeImage
   self.input = contentEditingInput;
   self.imageView.image = self.input.displaySizeImage;//将原始图片呈现出来
 }

 //点击右上方完成button时调用
 - (void)finishContentEditingWithCompletionHandler:(void (^)(PHContentEditingOutput *))completionHandler {
   //异步处理图片
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, ), ^{
       //创建output并设置
       PHContentEditingOutput *output = [[PHContentEditingOutput alloc] initWithContentEditingInput:self.input];
       NSData *archiveData = [NSKeyedArchiver archivedDataWithRootObject:self.currentFilterName];
 #warning Please set your Photos Extension Name and Version here
       PHAdjustmentData *adjustmentData = [[PHAdjustmentData alloc] initWithFormatIdentifier:@"qq100858433.JMImgure.JMImgure-Photo" formatVersion:@"1.0" data:archiveData];
       output.adjustmentData = adjustmentData;

       UIImage *fullImage = [UIImage imageWithContentsOfFile:self.input.fullSizeImageURL.path];
       fullImage = [self.imageFilterService applyFilter:self.currentFilterName toImage:fullImage];

       //将转化后的图片存到renderedContentURL中
       NSData *jpegData = UIImageJPEGRepresentation(fullImage, 1.0);
       BOOL saved = [jpegData writeToURL:output.renderedContentURL options:NSDataWritingAtomic error:nil];
       if (saved) {
         //回调处理结果给Photos
         //注：这里模拟机调试会出现无法显示修改后图片问题，真机调试没有问题
         completionHandler(output);
       } else {
         NSLog(@"An error occurred during save");
         completionHandler(nil);
       }
       // Clean up temporary files, etc.
     });
 }

 //点击左上方取消后调用
 - (BOOL)shouldShowCancelConfirmation {
   //返回YES，则会弹出AlertSheet让用户确认是否取消
   //返回NO，则页面直接消失
   return NO;
 }

 //shouldShowCancelConfirmation或finishContentEditingWithCompletionHandler:
 //之后调用，此函数在后台运行，负责清理临时文件
 - (void)cancelContentEditing {
     // Clean up temporary files, etc.
     // May be called after finishContentEditingWithCompletionHandler: while you prepare output.
 }

 @end

最后的说明：

在新建Photo Extension Target时，系统默认是只为图片添加扩展效果，那么视频呢

你可以在PHSupportedMediaTypes中修改你想支持的媒体类型

---

 

源码点击 包括未添加扩展的original版本和修改后版本