保存图片到相册就我所知的三种:UIImageWriteToSavedPhotosAlbum方法、ALAssetsLibrary、PHPhotoLibrary。好了难得说了上代码,GitHub地址
//
// ViewController.m
// 保存图片到相册
//
// Created by hooyking on 2017/5/22.
// Copyright © 2017年 hooyking. All rights reserved.
//
#import "ViewController.h"
#import <AssetsLibrary/AssetsLibrary.h>
#import <Photos/Photos.h>
#define SCREEN_W [UIScreen mainScreen].bounds.size.width
#define SCREEN_H [UIScreen mainScreen].bounds.size.height
@interface ViewController ()
//上方大图
@property (nonatomic, strong) UIImageView *imageView;
//下方小图
@property (nonatomic, strong) UIImageView *resImageView;
//图片标识
@property (nonatomic, strong) UILabel *symbolLabel;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"3种方式保存图片到相册";
self.view.backgroundColor = [UIColor whiteColor];
[self initUI];
}
#pragma mark - initUI
- (void)initUI {
self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(30, 80, SCREEN_W-60, 200)];
self.imageView.image = [UIImage imageNamed:@"showImage.jpg"];
[self.view addSubview:self.imageView];
NSArray *titleArr = @[@"1.UIImageWriteToSavedPhotosAlbum方法",@"2.ALAssetsLibrary",@"3.PHPhotoLibrary"];
for (int i = 0; i<3; i++) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 300+i*60, SCREEN_W, 40);
button.backgroundColor = [UIColor blueColor];
[button setTitle:titleArr[i] forState:UIControlStateNormal];
button.tag = i+200;
[self.view addSubview:button];
[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
}
self.resImageView = [[UIImageView alloc] initWithFrame:CGRectMake(80, 480, SCREEN_W-160, 80)];
[self.view addSubview:self.resImageView];
self.symbolLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 560, SCREEN_W, 60)];
self.symbolLabel.textAlignment = NSTextAlignmentCenter;
self.symbolLabel.numberOfLines = 0;
[self.view addSubview:self.symbolLabel];
}
#pragma mark
- (void)buttonClicked:(UIButton *)sender {
/**<iOS10以后注意要在Info.plist配置下访问相册权限,不然会崩>*/
if (sender.tag == 200) {
/**<第一种通用型>*/
UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);//按住command后点击鼠标左键访问这个方法,进去就能看到- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo,要知道是否保存成功必须使用这个系统回掉
} else if (sender.tag == 201) {
/**<第二种iOS4.1-iOS9.0,要加入AssetsLibrary.framework>*/
__block ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];
[lib writeImageToSavedPhotosAlbum:self.imageView.image.CGImage metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
if (!error) {
NSLog(@"2保存成功");
} else {
NSLog(@"2保存失败");
}
}];
} else {
/**<第三种iOS8.0-iOS10.x,要加入PhotosLibrary.framework>*/
//下面的一和二请注释掉一种看效果
//一、这个简单的处理图片保存到相册
// [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image];
// } completionHandler:^(BOOL success, NSError * _Nullable error) {
// if (success) {
// NSLog(@"3保存成功");
// } else {
// NSLog(@"3保存失败");
// }
// }];
//二、这个在保存图片后记录了图片标识,可再次根据标识取出来
[self SaveImageAndShowSymbolImage:self.imageView.image];
}
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
if (!error) {
NSLog(@"1保存成功");
}else {
NSLog(@"1保存失败");
}
}
- (void)SaveImageAndShowSymbolImage:(UIImage *)image {
__weak typeof(self) weakSelf = self;
NSMutableArray *imageSymbol = [NSMutableArray array];
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *req = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
[imageSymbol addObject:req.placeholderForCreatedAsset.localIdentifier];
NSLog(@"刚保存的图片标识:%@",req.placeholderForCreatedAsset.localIdentifier);
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success) {
NSLog(@"3保存成功,且图片标识已经记录");
//根据图片标识得到的相册中已保存图片
PHFetchResult *result = [PHAsset fetchAssetsWithLocalIdentifiers:imageSymbol options:nil];
for (PHAsset *temPHAsset in result) {
//获取图片二进制数据
[[PHImageManager defaultManager] requestImageDataForAsset:temPHAsset options:nil resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
weakSelf.symbolLabel.text = imageSymbol.lastObject;
weakSelf.resImageView.image = [UIImage imageWithData:imageData];
}];
}
}
}];
}
@end