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, 0), ^{
//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