最近做一個聊天的項目，需要發送圖片后讀取本地圖片顯示到列表里。剛開始的時候，天真的認為可以用SDWebImage直接加載，然后并不能行。

于是在網上搜了搜，如何根據從相冊獲取的UIImagePickerControllerReferenceURL讀取圖片， 代碼如下：

#import "ViewController.h" #import <AssetsLibrary/AssetsLibrary.h>@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate> - (IBAction)showImagePickerVC:(id)sender; @property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad]; }

?彈出圖片選擇器

- (IBAction)showImagePickerVC:(id)sender {UIImagePickerController *imagePickerVC = [[UIImagePickerController alloc] init];imagePickerVC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;imagePickerVC.allowsEditing = YES;imagePickerVC.delegate = self;[self presentViewController:imagePickerVC animated:YES completion:nil];}

?回調

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {NSLog(@"%@", info);NSURL *imagePath = info[@"UIImagePickerControllerReferenceURL"];if ([[[imagePath scheme] lowercaseString] isEqualToString:@"assets-library"]) {// Load from asset library asyncdispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{@autoreleasepool {@try {ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init];[assetslibrary assetForURL:imagePathresultBlock:^(ALAsset *asset){ALAssetRepresentation *rep = [asset defaultRepresentation];CGImageRef iref = [rep fullScreenImage];if (iref) {//進行UI修改dispatch_sync(dispatch_get_main_queue(), ^{_imageView.image = [[UIImage alloc] initWithCGImage:iref];});}}failureBlock:^(NSError *error) {NSLog(@"從圖庫獲取圖片失敗: %@",error);}];} @catch (NSException *e) {NSLog(@"從圖庫獲取圖片異常: %@", e);}}});}[picker dismissViewControllerAnimated:YES completion:nil]; }

?

轉載于:https://www.cnblogs.com/pretty-guy/p/4548761.html

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