PHImageManager 获取图片模糊

    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);

    }];

　用以上的代码去获取图片会出现模糊，不清晰的状况。（明明options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat 设置为高清了）

   其实坑就在于contentMode 写成了self.view.bounds.size，如果需要获取清晰的请设置为：PHImageManagerMaximumSize。或者换一种读取图片的方法：

    [[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);
    }];