获取图片大小时，设置networkAccessAllowed为YES

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -419,6 +419,7 @@ static dispatch_once_t onceToken;
         if ([model.asset isKindOfClass:[PHAsset class]]) {
             PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
             options.resizeMode = PHImageRequestOptionsResizeModeFast;
+            options.networkAccessAllowed = YES;
             [[PHImageManager defaultManager] requestImageDataForAsset:model.asset options:options resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
                 if (model.type != TZAssetModelMediaTypeVideo) dataLength += imageData.length;
                 assetCount ++;