iOS8中添加的extensions总结（三）——图片编辑扩展

   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 //撤销的button  31 - (IBAction)undo:(id)sender {  32   self.imageView.image = self.input.displaySizeImage;  33   self.currentFilterName = nil;  34   self.filteredImage = nil;  35 }  36   37 //添加过滤器  38 - (IBAction)addFilter:(id)sender {  39   UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"过滤器" message:@"请选择一种过滤器" preferredStyle:UIAlertControllerStyleActionSheet];  40   //遍历字典  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       //为图片添加过滤  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  72 //你想获取调整后的adjustmentData的话，那么返回YES  73 //只有图片经过调整才会调用此函数，否则默认NO  74 - (BOOL)canHandleAdjustmentData:(PHAdjustmentData *)adjustmentData {  75   return NO;  76 }  77   78 //view Load后，view appear前调用，用来接受原始数据contentEditingInput  79 - (void)startContentEditingWithInput:(PHContentEditingInput *)contentEditingInput placeholderImage:(UIImage *)placeholderImage {  80   //canHandleAdjustmentData:返回YES的话，这里的contentEditingInput也会带上adjustmentData  81   //canHandleAdjustmentData:返回NO的话，这里只有原始图像displaySizeImage  82   self.input = contentEditingInput;  83   self.imageView.image = self.input.displaySizeImage;//将原始图片呈现出来  84 }  85   86 //点击右上方完成button时调用  87 - (void)finishContentEditingWithCompletionHandler:(void (^)(PHContentEditingOutput *))completionHandler {  88   //异步处理图片  89     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  90       //创建output并设置  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       //将转化后的图片存到renderedContentURL中 101       NSData *jpegData = UIImageJPEGRepresentation(fullImage, 1.0); 102       BOOL saved = [jpegData writeToURL:output.renderedContentURL options:NSDataWritingAtomic error:nil]; 103       if (saved) { 104         //回调处理结果给Photos 105         //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 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 //点击左上方取消后调用 116 - (BOOL)shouldShowCancelConfirmation { 117   //返回YES，则会弹出AlertSheet让用户确认是否取消 118   //返回NO，则页面直接消失 119   return NO; 120 } 121  122 //shouldShowCancelConfirmation或finishContentEditingWithCompletionHandler: 123 //之后调用，此函数在后台运行，负责清理临时文件 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