PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = true;
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
options.networkAccessAllowed = YES;
options.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
    /*
     Progress callbacks may not be on the main thread. Since we're updating
     the UI, dispatch to the main queue.
     */
    dispatch_async(dispatch_get_main_queue(), ^{
       if(handler)  handler(progress);
    });
};
 
[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:self.view.bounds.size options:options resultHandler:^(UIImage *result, NSDictionary *info) {
    // Hide the progress view now the request has completed.
 
    // Check if the request was successful.
 
    if(manager) manager(result);
 
}];

用以上的代碼去獲取圖片會出現(xiàn)模糊，不清晰的狀況。（明明options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat 設(shè)置為高清了）

其實坑就在于contentMode 寫成了self.view.bounds.size，如果需要獲取清晰的請設(shè)置為：PHImageManagerMaximumSize?；蛘邠Q一種讀取圖片的方法：

[[PHImageManager defaultManager] requestImageDataForAsset:asset options:options resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
    UIImage * result = [UIImage imageWithData:imageData];
    if(manager) manager(result);
}];