MWPhotoBrowser框架的使用步骤
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- 下载MWPhotoBrowser
地址：https://github.com/mwaterfall/MWPhotoBrowser
突然发现并不像以前那样把框架拖进去导入头文件就可以使用，现在压根都没有封装好的库给我们拖，而且MWPhotoBrowser还依赖其他很多库，所以你不但要各种下载支持库，还要配置。所以推荐使用CocoaPods，轻轻松松完成各种配置。而且框架更新了，还会提示更新。至于有什么好处，怎样使用，自己百度一下吧，下次在整理CocoaPods的使用文章给大家。 - 使用pod方式
完成之后，不要着急，先运行一次。曾经试过一pod进来运行就出现一大推错误，大多是版本问题，所以pod的时候看看自己的项目是否对应起来，建议pod的时候写上6.0以上的
OK，没问题之后开始使用
- 看代码吧，直观
- 先从简单的开始，加载本地图片,把下面代码直接复制到- (void)viewDidLoad方法中
// Browser NSMutableArray *photos = [[NSMutableArray alloc] init]; NSMutableArray *thumbs = [[NSMutableArray alloc] init]; MWPhoto *photo; BOOL displayActionButton = YES; BOOL displaySelectionButtons = YES; BOOL displayNavArrows = YES; BOOL enableGrid = YES; BOOL startOnGrid = YES; // Photos photo = [MWPhoto photoWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MWPhotoBrowser5" ofType:@".png"]]]; // caption图片的描述 photo.caption = @"Fireworks"; [photos addObject:photo]; photo = [MWPhoto photoWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MWPhotoBrowser5t" ofType:@".png"]]]; photo.caption = @"The London Eye is a giant Ferris wheel situated on the banks of the River Thames, in London, England."; [photos addObject:photo]; photo = [MWPhoto photoWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MWPhotoBrowser6" ofType:@".png"]]]; photo.caption = @"York Floods"; [photos addObject:photo]; photo = [MWPhoto photoWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MWPhotoBrowser6t" ofType:@".png"]]]; photo.caption = @"Campervan"; [photos addObject:photo]; // Options self.photos = photos; self.thumbs = thumbs; // // Create browser MWPhotoBrowser *browser = [[MWPhotoBrowser alloc] initWithDelegate:self]; browser.displayActionButton = displayActionButton;//分享按钮,默认是 browser.displayNavArrows = displayNavArrows;//左右分页切换,默认否 browser.displaySelectionButtons = displaySelectionButtons;//是否显示选择按钮在图片上,默认否 browser.alwaysShowControls = displaySelectionButtons;//控制条件控件 是否显示,默认否 browser.zoomPhotosToFill = NO;//是否全屏,默认是#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0 browser.wantsFullScreenLayout = YES;//是否全屏#endif browser.enableGrid = enableGrid;//是否允许用网格查看所有图片,默认是 browser.startOnGrid = startOnGrid;//是否第一张,默认否 browser.enableSwipeToDismiss = YES; [browser showNextPhotoAnimated:YES]; [browser showPreviousPhotoAnimated:YES]; [browser setCurrentPhotoIndex:0]; if (displaySelectionButtons) { _selections = [NSMutableArray new]; for (int i = 0; i < photos.count; i++) { [_selections addObject:[NSNumber numberWithBool:NO]]; } } // ------------------------这里非常重要，对于基础不扎实的同学。首先你的新工程有没有根控制器UINavigationController或者是UITabBarController，如果没有根控制器，你的ViewController就不是根控制器的子控制器，所以你使用[self.navigationController pushViewController:browser animated:YES];是没有效果的。当然你想只是看看效果，使用[self presentViewController:browser animated:YES completion:nil];就可以了------------------------// [self presentViewController:browser animated:YES completion:nil]; [self.navigationController pushViewController:browser animated:YES];- 必须实现代理的方法
#pragma mark - MWPhotoBrowserDelegate/** * 告诉他你有多少图片 * * @param photoBrowser photoBrowser * * @return count */- (NSUInteger)numberOfPhotosInPhotoBrowser:(MWPhotoBrowser *)photoBrowser { return _photos.count;}/** * 通过下标获取图片 */ * (id )photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index { if (index < _photos.count) return [_photos objectAtIndex:index]; return nil;}- 好了，基本可以使用了。但是很多时候，我们要访问的是我们手机里面的图片，怎么办呢？尼玛，超级复杂。iOS 8.0 以前的使用AssetsLibrary，8.0以后改成了Photos。先不说现在要判断一下系统使用的是哪个，单单使用它们也超级蛋疼。非常蛋疼
- 先看看代码吧
#pragma mark - Load Assets - (void)loadAssets { if (NSClassFromString(@"PHAsset")) { // Check library permissions PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus]; if (status == PHAuthorizationStatusNotDetermined) { // 没有提醒状态 [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) { if (status == PHAuthorizationStatusAuthorized) { // 授权成功 // 加载资源 [self performLoadAssets]; } }]; } else if (status == PHAuthorizationStatusAuthorized) { // 授权成功 // 加载资源 [self performLoadAssets]; } } else { // Assets library // 加载资源 [self performLoadAssets]; }} - (void)performLoadAssets { // Initialise _assets = [NSMutableArray new]; // Load if (NSClassFromString(@"PHAsset")) { // Photos library iOS >= 8 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ // options设置相关参数 PHFetchOptions *options = [PHFetchOptions new]; options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]]; PHFetchResult *fetchResults = [PHAsset fetchAssetsWithOptions:options]; // 遍历 [fetchResults enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { [_assets addObject:obj]; }]; }); } else { // Assets Library iOS < 8 _ALAssetsLibrary = [[ALAssetsLibrary alloc] init]; // Run in the background as it takes a while to get all assets from the library dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSMutableArray *assetGroups = [[NSMutableArray alloc] init]; NSMutableArray *assetURLDictionaries = [[NSMutableArray alloc] init]; // Process assets void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) { if (result != nil) { // 获取asset类型 NSString *assetType = [result valueForProperty:ALAssetPropertyType]; // 判断类型 if ([assetType isEqualToString:ALAssetTypePhoto] || [assetType isEqualToString:ALAssetTypeVideo]) { [assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]]; NSURL *url = result.defaultRepresentation.url; [_ALAssetsLibrary assetForURL:url resultBlock:^(ALAsset *asset) { if (asset) { @synchronized(_assets) { [_assets addObject:asset]; } } } failureBlock:^(NSError *error){ NSLog(@"operation was not successfull!"); }]; } } }; // Process groups void (^ assetGroupEnumerator) (ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) { if (group != nil) { [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:assetEnumerator]; [assetGroups addObject:group]; } }; // Process! [_ALAssetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:assetGroupEnumerator failureBlock:^(NSError *error) { NSLog(@"There is an error"); }]; }); }}- 是不是很多代码，然而这只是冰山一角，仅仅是加载了相册的图片资源。数组里面不是PHAsset就是ALAsset，你以为这样就完了，NO。。。。
- 虽然这两个对象都有图片的各种信息，可是我只要图片。。。。。
看代码
//// ViewController.m// TestMWPhotoBrowers//// Created by FTY on 16/3/8.// Copyright © 2016年 FTY. All rights reserved.//#import "ViewController.h"#import <AssetsLibrary/AssetsLibrary.h>#import <Photos/Photos.h>#import "MWPhotoBrowser.h"@interface ViewController () <MWPhotoBrowserDelegate>{ // 选中的图片 NSMutableArray *_selections;}/** * 图片集合 */@property (nonatomic, strong) NSMutableArray *photos;/** * 缩略图集合 */@property (strong, nonatomic) NSMutableArray *thumbs;/** * 相册集合 */@property (nonatomic, strong) NSMutableArray *assets;/** * ALAssetsLibrary库 */@property (nonatomic, strong) ALAssetsLibrary *ALAssetsLibrary;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad];// 加载资源[self loadAssets];UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd]; button.frame = CGRectMake(100, 100, 100, 100); [self.view addSubview:button]; [button addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];}- (void)test{ // Browser NSMutableArray *photos = [[NSMutableArray alloc] init]; NSMutableArray *thumbs = [[NSMutableArray alloc] init]; BOOL displayActionButton = YES; BOOL displaySelectionButtons = YES; BOOL displayNavArrows = YES; BOOL enableGrid = YES; BOOL startOnGrid = YES; // Options @synchronized(_assets) { NSMutableArray *copy = [_assets copy]; if (NSClassFromString(@"PHAsset")) { // Photos library UIScreen *screen = [UIScreen mainScreen]; CGFloat scale = screen.scale; // Sizing is very rough... more thought required in a real implementation CGFloat imageSize = MAX(screen.bounds.size.width, screen.bounds.size.height) * 1.5; CGSize imageTargetSize = CGSizeMake(imageSize * scale, imageSize * scale); CGSize thumbTargetSize = CGSizeMake(imageSize / 3.0 * scale, imageSize / 3.0 * scale); for (PHAsset *asset in copy) { [photos addObject:[MWPhoto photoWithAsset:asset targetSize:imageTargetSize]]; [thumbs addObject:[MWPhoto photoWithAsset:asset targetSize:thumbTargetSize]]; } } else { // Assets library for (ALAsset *asset in copy) { MWPhoto *photo = [MWPhoto photoWithURL:asset.defaultRepresentation.url]; [photos addObject:photo]; MWPhoto *thumb = [MWPhoto photoWithImage:[UIImage imageWithCGImage:asset.thumbnail]]; [thumbs addObject:thumb]; } } } self.photos = photos; self.thumbs = thumbs; // // Create browser MWPhotoBrowser *browser = [[MWPhotoBrowser alloc] initWithDelegate:self]; browser.displayActionButton = displayActionButton;//分享按钮,默认是 browser.displayNavArrows = displayNavArrows;//左右分页切换,默认否 browser.displaySelectionButtons = displaySelectionButtons;//是否显示选择按钮在图片上,默认否 browser.alwaysShowControls = displaySelectionButtons;//控制条件控件 是否显示,默认否 browser.zoomPhotosToFill = NO;//是否全屏,默认是#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0 browser.wantsFullScreenLayout = YES;//是否全屏#endif browser.enableGrid = enableGrid;//是否允许用网格查看所有图片,默认是 browser.startOnGrid = startOnGrid;//是否第一张,默认否 browser.enableSwipeToDismiss = YES; [browser showNextPhotoAnimated:YES]; [browser showPreviousPhotoAnimated:YES]; [browser setCurrentPhotoIndex:0]; if (displaySelectionButtons) { _selections = [NSMutableArray new]; for (int i = 0; i < photos.count; i++) { [_selections addObject:[NSNumber numberWithBool:NO]]; } }// [self presentViewController:browser animated:YES completion:nil]; [self.navigationController pushViewController:browser animated:YES];}#pragma mark - Load Assets- (void)loadAssets { if (NSClassFromString(@"PHAsset")) { // Check library permissions PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus]; if (status == PHAuthorizationStatusNotDetermined) { // 没有提醒状态 [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) { if (status == PHAuthorizationStatusAuthorized) { // 授权成功 // 加载资源 [self performLoadAssets]; } }]; } else if (status == PHAuthorizationStatusAuthorized) { // 授权成功 // 加载资源 [self performLoadAssets]; } } else { // Assets library // 加载资源 [self performLoadAssets]; }}- (void)performLoadAssets { // Initialise _assets = [NSMutableArray new]; // Load if (NSClassFromString(@"PHAsset")) { // Photos library iOS >= 8 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ // options设置相关参数 PHFetchOptions *options = [PHFetchOptions new]; options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]]; PHFetchResult *fetchResults = [PHAsset fetchAssetsWithOptions:options]; // 遍历 [fetchResults enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { [_assets addObject:obj]; }]; }); } else { // Assets Library iOS < 8 _ALAssetsLibrary = [[ALAssetsLibrary alloc] init]; // Run in the background as it takes a while to get all assets from the library dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSMutableArray *assetGroups = [[NSMutableArray alloc] init]; NSMutableArray *assetURLDictionaries = [[NSMutableArray alloc] init]; // Process assets void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) { if (result != nil) { // 获取asset类型 NSString *assetType = [result valueForProperty:ALAssetPropertyType]; // 判断类型 if ([assetType isEqualToString:ALAssetTypePhoto] || [assetType isEqualToString:ALAssetTypeVideo]) { [assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]]; NSURL *url = result.defaultRepresentation.url; [_ALAssetsLibrary assetForURL:url resultBlock:^(ALAsset *asset) { if (asset) { @synchronized(_assets) { [_assets addObject:asset]; } } } failureBlock:^(NSError *error){ NSLog(@"operation was not successfull!"); }]; } } }; // Process groups void (^ assetGroupEnumerator) (ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) { if (group != nil) { [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:assetEnumerator]; [assetGroups addObject:group]; } }; // Process! [_ALAssetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:assetGroupEnumerator failureBlock:^(NSError *error) { NSLog(@"There is an error"); }]; }); }}#pragma mark - MWPhotoBrowserDelegate/** * 告诉他你有多少图片 * * @param photoBrowser photoBrowser * * @return count */- (NSUInteger)numberOfPhotosInPhotoBrowser:(MWPhotoBrowser *)photoBrowser { return _photos.count;}/** * 通过下标获取图片 */- (id )photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index { if (index < _photos.count) return [_photos objectAtIndex:index]; return nil;}- (void)photoBrowser:(MWPhotoBrowser *)photoBrowser didDisplayPhotoAtIndex:(NSUInteger)index { NSLog(@"Did start viewing photo at index %lu", (unsigned long)index);}- (BOOL)photoBrowser:(MWPhotoBrowser *)photoBrowser isPhotoSelectedAtIndex:(NSUInteger)index { return [[_selections objectAtIndex:index] boolValue];}- (void)photoBrowser:(MWPhotoBrowser *)photoBrowser photoAtIndex:(NSUInteger)index selectedChanged:(BOOL)selected { [_selections replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:selected]]; NSLog(@"Photo at index %lu selected %@", (unsigned long)index, selected ? @"YES" : @"NO");}- (void)photoBrowserDidFinishModalPresentation:(MWPhotoBrowser *)photoBrowser { // If we subscribe to this method we must dismiss the view controller ourselves NSLog(@"Did finish modal presentation"); [self dismissViewControllerAnimated:YES completion:nil];}@end- 你会发现，会报错，原因是作业根本没有提供[MWPhoto photoWithAsset:asset targetSize:imageTargetSize]这个类方法给你，而且拿到PHAsset也不会使用。放心，原作者有提供demo，把它补上去。
//// MWPhoto.h// MWPhotoBrowser//// Created by Michael Waterfall on 17/10/2010.// Copyright 2010 d3i. All rights reserved.//#import <Foundation/Foundation.h>#import "MWPhotoProtocol.h"#import <Photos/Photos.h>// This class models a photo/image and it's caption// If you want to handle photos, caching, decompression// yourself then you can simply ensure your custom data model// conforms to MWPhotoProtocol@interface MWPhoto : NSObject <MWPhoto>@property (nonatomic, strong) NSString *caption;@property (nonatomic, readonly) UIImage *image;@property (nonatomic, readonly) NSURL *photoURL;@property (nonatomic, readonly) NSString *filePath __attribute__((deprecated("Use photoURL"))); // Depreciated@property (nonatomic) BOOL isVideo;+ (MWPhoto *)photoWithImage:(UIImage *)image;+ (MWPhoto *)photoWithFilePath:(NSString *)path __attribute__((deprecated("Use photoWithURL: with a file URL"))); // Depreciated+ (MWPhoto *)photoWithURL:(NSURL *)url;+ (MWPhoto *)photoWithAsset:(PHAsset *)asset targetSize:(CGSize)targetSize;- (id)initWithImage:(UIImage *)image;- (id)initWithURL:(NSURL *)url;- (id)initWithFilePath:(NSString *)path __attribute__((deprecated("Use initWithURL: with a file URL"))); // Depreciated- (id)initWithAsset:(PHAsset *)asset targetSize:(CGSize)targetSize;@end//// MWPhoto.m// MWPhotoBrowser//// Created by Michael Waterfall on 17/10/2010.// Copyright 2010 d3i. All rights reserved.//#import "MWPhoto.h"#import "MWPhotoBrowser.h"#import "SDWebImageDecoder.h"#import "SDWebImageManager.h"#import "SDWebImageOperation.h"#import <AssetsLibrary/AssetsLibrary.h>@interface MWPhoto () { BOOL _loadingInProgress; id <SDWebImageOperation> _webImageOperation; PHImageRequestID _assetRequestID;}@property (nonatomic, strong) PHAsset *asset;@property (nonatomic) CGSize assetTargetSize;- (void)imageLoadingComplete;@end@implementation MWPhoto@synthesize underlyingImage = _underlyingImage; // synth property from protocol#pragma mark - Class Methods+ (MWPhoto *)photoWithImage:(UIImage *)image { return [[MWPhoto alloc] initWithImage:image];}// Deprecated+ (MWPhoto *)photoWithFilePath:(NSString *)path { return [MWPhoto photoWithURL:[NSURL fileURLWithPath:path]];}+ (MWPhoto *)photoWithURL:(NSURL *)url { return [[MWPhoto alloc] initWithURL:url];}+ (MWPhoto *)photoWithAsset:(PHAsset *)asset targetSize:(CGSize)targetSize { return [[MWPhoto alloc] initWithAsset:asset targetSize:targetSize];}#pragma mark - Init- (id)initWithImage:(UIImage *)image { if ((self = [super init])) { _image = image; } return self;}// Deprecated- (id)initWithFilePath:(NSString *)path { if ((self = [super init])) { _photoURL = [NSURL fileURLWithPath:path]; } return self;}- (id)initWithURL:(NSURL *)url { if ((self = [super init])) { _photoURL = [url copy]; } return self;}- (id)initWithAsset:(PHAsset *)asset targetSize:(CGSize)targetSize { if ((self = [super init])) { self.asset = asset; self.assetTargetSize = targetSize; self.isVideo = asset.mediaType == PHAssetMediaTypeVideo; } return self;}#pragma mark - MWPhoto Protocol Methods- (UIImage *)underlyingImage { return _underlyingImage;}- (void)loadUnderlyingImageAndNotify { NSAssert([[NSThread currentThread] isMainThread], @"This method must be called on the main thread."); if (_loadingInProgress) return; _loadingInProgress = YES; @try { if (self.underlyingImage) { [self imageLoadingComplete]; } else { [self performLoadUnderlyingImageAndNotify]; } } @catch (NSException *exception) { self.underlyingImage = nil; _loadingInProgress = NO; [self imageLoadingComplete]; } @finally { }}// Set the underlyingImage- (void)performLoadUnderlyingImageAndNotify { // Get underlying image if (_image) { // We have UIImage! self.underlyingImage = _image; [self imageLoadingComplete]; } else if (_photoURL) { // Check what type of url it is if ([[[_photoURL scheme] lowercaseString] isEqualToString:@"assets-library"]) { // Load from asset library async dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ @autoreleasepool { @try { ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init]; [assetslibrary assetForURL:_photoURL resultBlock:^(ALAsset *asset){ ALAssetRepresentation *rep = [asset defaultRepresentation]; CGImageRef iref = [rep fullScreenImage]; if (iref) { self.underlyingImage = [UIImage imageWithCGImage:iref]; } [self performSelectorOnMainThread:@selector(imageLoadingComplete) withObject:nil waitUntilDone:NO]; } failureBlock:^(NSError *error) { self.underlyingImage = nil; MWLog(@"Photo from asset library error: %@",error); [self performSelectorOnMainThread:@selector(imageLoadingComplete) withObject:nil waitUntilDone:NO]; }]; } @catch (NSException *e) { MWLog(@"Photo from asset library error: %@", e); [self performSelectorOnMainThread:@selector(imageLoadingComplete) withObject:nil waitUntilDone:NO]; } } }); } else if ([_photoURL isFileReferenceURL]) { // Load from local file async dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ @autoreleasepool { @try { self.underlyingImage = [UIImage imageWithContentsOfFile:_photoURL.path]; if (!_underlyingImage) { MWLog(@"Error loading photo from path: %@", _photoURL.path); } } @finally { [self performSelectorOnMainThread:@selector(imageLoadingComplete) withObject:nil waitUntilDone:NO]; } } }); } else { // Load async from web (using SDWebImage) @try { SDWebImageManager *manager = [SDWebImageManager sharedManager]; _webImageOperation = [manager downloadImageWithURL:_photoURL options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) { if (expectedSize > 0) { float progress = receivedSize / (float)expectedSize; NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat:progress], @"progress", self, @"photo", nil]; [[NSNotificationCenter defaultCenter] postNotificationName:MWPHOTO_PROGRESS_NOTIFICATION object:dict]; } } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) { if (error) { MWLog(@"SDWebImage failed to download image: %@", error); } _webImageOperation = nil; self.underlyingImage = image; [self imageLoadingComplete]; }]; } @catch (NSException *e) { MWLog(@"Photo from web: %@", e); _webImageOperation = nil; [self imageLoadingComplete]; } } } else if (_asset){ [self _performLoadUnderlyingImageAndNotifyWithAsset: _asset targetSize:_assetTargetSize]; } else { // Failed - no source @throw [NSException exceptionWithName:@"Failed - no source" reason:nil userInfo:nil]; }}// Load from photos library- (void)_performLoadUnderlyingImageAndNotifyWithAsset:(PHAsset *)asset targetSize:(CGSize)targetSize { PHImageManager *imageManager = [PHImageManager defaultManager]; PHImageRequestOptions *options = [PHImageRequestOptions new]; options.networkAccessAllowed = YES; options.resizeMode = PHImageRequestOptionsResizeModeFast; options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; options.synchronous = false; options.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) { NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithDouble: progress], @"progress", self, @"photo", nil]; [[NSNotificationCenter defaultCenter] postNotificationName:MWPHOTO_PROGRESS_NOTIFICATION object:dict]; }; _assetRequestID = [imageManager requestImageForAsset:asset targetSize:targetSize contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage *result, NSDictionary *info) { dispatch_async(dispatch_get_main_queue(), ^{ self.underlyingImage = result; [self imageLoadingComplete]; }); }];}// Release if we can get it again from path or url- (void)unloadUnderlyingImage { _loadingInProgress = NO; self.underlyingImage = nil;}- (void)imageLoadingComplete { NSAssert([[NSThread currentThread] isMainThread], @"This method must be called on the main thread."); // Complete so notify _loadingInProgress = NO; // Notify on next run loop [self performSelector:@selector(postCompleteNotification) withObject:nil afterDelay:0];}- (void)postCompleteNotification { [[NSNotificationCenter defaultCenter] postNotificationName:MWPHOTO_LOADING_DID_END_NOTIFICATION object:self];}- (void)cancelAnyLoading { if (_webImageOperation != nil) { [_webImageOperation cancel]; _loadingInProgress = NO; } else if (_assetRequestID != PHInvalidImageRequestID) { [[PHImageManager defaultManager] cancelImageRequest:_assetRequestID]; _assetRequestID = PHInvalidImageRequestID; }}@end自己找不同。。。。。
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