iOS 获取相册中最近的一张图片

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iOS8之前的

-(void)getiOS8LastImage{    PHAsset *asset = [PHAsset latestAsset];    PHCachingImageManager *imageManager = [[PHCachingImageManager alloc] init];    [imageManager requestImageForAsset:asset targetSize:CGSizeZero contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {        if (result) {            _imgV.image = result;            [self showSuitFrame:_imgV img:result];        }    }];}

实现

@implementation PHAsset (PFLast)+ (PHAsset *)latestAsset {    // 获取所有资源的集合，并按资源的创建时间排序    PHFetchOptions *options = [[PHFetchOptions alloc] init];    options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];    PHFetchResult *assetsFetchResults = [PHAsset fetchAssetsWithOptions:options];    return [assetsFetchResults firstObject];}

iOS8之后的

-(void)getPreiOS8LastImage{    ALAssetsLibrary *al = [[ALAssetsLibrary alloc] init];    [al latestAsset:^(ALAsset * _Nullable asset, NSError * _Nullable error) {        NSString *type = [asset valueForProperty:ALAssetPropertyType];        if ([type isEqual:ALAssetTypePhoto]){            UIImage *needImage = [UIImage imageWithCGImage:asset.defaultRepresentation.fullScreenImage];            if (needImage) {                _imgV.image = needImage;                [self showSuitFrame:_imgV img:needImage];            }        }    }];}

实现

@implementation ALAssetsLibrary (PFLast)- (void)latestAsset:(void (^)(ALAsset * _Nullable, NSError *_Nullable))block {    [self enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {        if (group) {            [group setAssetsFilter:[ALAssetsFilter allPhotos]];            [group enumerateAssetsWithOptions:NSEnumerationReverse/*遍历方式*/ usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {                if (result) {                    if (block) {                        block(result,nil);                    }                    *stop = YES;                }            }];            *stop = YES;        }    } failureBlock:^(NSError *error) {        if (error) {            if (block) {                block(nil,error);            }        }    }];}@end

#pragma mark - 根据image调整UIImageView的大小-(void)showSuitFrame:(UIView *)theView img:(UIImage *)img{    CGFloat width = img.size.width;    CGFloat height = img.size.height;    if (width>height) {//宽不变        CGRect frame = theView.frame;        frame.size.height = (CGFloat)theView.frame.size.height*(height/width);        theView.frame = frame;    }else if(width<height){//高不变        CGRect frame = theView.frame;        frame.size.width = (CGFloat)theView.frame.size.width*(width/height);        theView.frame = frame;    }else{//都不变            }}

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