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iOS 保存图片到相册

2018年02月06日  | 移动技术网移动技术  | 我要评论

iOS 保存图片到相册

//方法调用

NSMutableData *data = [NSMutableData dataWithContentsOfFile:_SaveFilepath];

UIImage *myImage = [UIImage imageWithData:data];

STAlbumManager *stabumManager = [STAlbumManager sharedManager];

[stabumManager saveImage:myImage toAlbum:@"电子发票" completionHandler:^(UIImage *image, NSError *error){}];

//类实现

//

// STAlbumManager.h

// BSbracelet

//

// Created by Christopher on 17/4/28.

// Copyright ? 2017年 ZTracy. All rights reserved.

//

#import

#import

@class UIImage;

typedef void (^STAlbumSaveHandler)(UIImage *image, NSError *error);

/**

* @brief 将图片写入相册,使用ALAssetLibrary

*

* @param image 需要写入的图片

* @param album 相册名称，如果相册不存在，则新建相册

* @param completionHandler 回调

*/

extern void STImageWriteToPhotosAlbum(UIImage *image, NSString *album, STAlbumSaveHandler completionHandler);

@interface STAlbumManager : NSObject

+ (instancetype)sharedManager;

/**

* @brief 将图片写入相册,使用ALAssetLibrary

*

* @param image 需要写入的图片

* @param album 相册名称，如果相册不存在，则新建相册

* @param completionHandler 回调

*/

- (void)saveImage:(UIImage *)image toAlbum:(NSString *)album completionHandler:(STAlbumSaveHandler)completionHandler;

@end

@interface ALAssetsLibrary (STAssetsLibrary)

- (void)writeImage:(UIImage *)image toAlbum:(NSString *)album completionHandler:(STAlbumSaveHandler)completionHandler;

@end


//

// STAlbumManager.m

// BSbracelet

//

// Created by Christopher on 17/4/28.

// Copyright ? 2017年 ZTracy. All rights reserved.

//

#import "STAlbumManager.h"

#import

void STImageWriteToPhotosAlbum(UIImage *image, NSString *album, STAlbumSaveHandler completionHandler) {

[[STAlbumManager sharedManager] saveImage:image toAlbum:album completionHandler:completionHandler];

}

@interface STAlbumManager ()

@property(nonatomic, strong) ALAssetsLibrary *assetsLibrary;

@end

@implementation STAlbumManager

static STAlbumManager *_sharedManager;

+ (instancetype)sharedManager {

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{ _sharedManager = [[self alloc] init]; });

return _sharedManager;

}

- (instancetype)init {

self = [super init];

if (self) {

}

return self;

}

- (ALAssetsLibrary *)assetsLibrary {

if (!_assetsLibrary) {

_assetsLibrary = [[ALAssetsLibrary alloc] init];

}

return _assetsLibrary;

}

- (void)saveImage:(UIImage *)image toAlbum:(NSString *)album completionHandler:(STAlbumSaveHandler)completionHandler {

[self.assetsLibrary writeImage:image

toAlbum:album

completionHandler:^(UIImage *image, NSError *error) {

if (completionHandler) {

completionHandler(image, error);

}

/// 注意，这里每次都置空是因为期间如果操作相册了，下次保存之前希望能取到最新状态。

self.assetsLibrary = nil;

}];

}

@end

@implementation ALAssetsLibrary (STAssetsLibrary)

- (void)writeImage:(UIImage *)image toAlbum:(NSString *)album completionHandler:(STAlbumSaveHandler)completionHandler {

[self writeImageToSavedPhotosAlbum:image.CGImage

orientation:(ALAssetOrientation)image.imageOrientation

completionBlock:^(NSURL *assetURL, NSError *error) {

if (error) {

if (completionHandler) {

completionHandler(image, error);

}

} else {

[self addAssetURL:assetURL

toAlbum:album

completionHandler:^(NSError *error) {

if (completionHandler) {

completionHandler(image, error);

}

}];

}

}];

}

- (void)addAssetURL:(NSURL *)assetURL toAlbum:(NSString *)album completionHandler:(ALAssetsLibraryAccessFailureBlock)completionHandler {

void (^assetForURLBlock)(NSURL *, ALAssetsGroup *) = ^(NSURL *URL, ALAssetsGroup *group) {

[self assetForURL:assetURL

resultBlock:^(ALAsset *asset) {

[group addAsset:asset];

completionHandler(nil);

}

failureBlock:^(NSError *error) { completionHandler(error); }];

};

__block ALAssetsGroup *group;

[self enumerateGroupsWithTypes:ALAssetsGroupAlbum

usingBlock:^(ALAssetsGroup *_group, BOOL *stop) {

if ([album isEqualToString:[_group valueForProperty:ALAssetsGroupPropertyName]]) {

group = _group;

}

if (!_group) {

/// 循环结束

if (group) {

assetForURLBlock(assetURL, group);

} else {

[self addAssetsGroupAlbumWithName:album

resultBlock:^(ALAssetsGroup *group) { assetForURLBlock(assetURL, group); }

failureBlock:completionHandler];

}

}

}

failureBlock:completionHandler];

}

@end


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