优化TZImageManager的一些细节

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -59,7 +59,7 @@
 - (int32_t)getPhotoWithAsset:(id)asset photoWidth:(CGFloat)photoWidth completion:(void (^)(UIImage *photo,NSDictionary *info,BOOL isDegraded))completion progressHandler:(void (^)(double progress, NSError *error, BOOL *stop, NSDictionary *info))progressHandler networkAccessAllowed:(BOOL)networkAccessAllowed;
 
 /// Get full Image 获取原图
-/// 该方法会先返回缩略图，再返回原图，如果info[PHImageResultIsDegradedKey] 为 YES，则表明当前返回的是缩略图，否则是原图。
+/// 该方法一般会先返回缩略图，再返回原图(详见方法内部使用的系统API的说明)，如果info[PHImageResultIsDegradedKey] 为 YES，则表明当前返回的是缩略图，否则是原图。
 - (void)getOriginalPhotoWithAsset:(id)asset completion:(void (^)(UIImage *photo,NSDictionary *info))completion;
 - (void)getOriginalPhotoWithAsset:(id)asset newCompletion:(void (^)(UIImage *photo,NSDictionary *info,BOOL isDegraded))completion;
 - (void)getOriginalPhotoDataWithAsset:(id)asset completion:(void (^)(NSData *data,NSDictionary *info,BOOL isDegraded))completion;

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -534,8 +534,9 @@ static CGFloat TZScreenScale;
 
 - (void)getOriginalPhotoDataWithAsset:(id)asset completion:(void (^)(NSData *data,NSDictionary *info,BOOL isDegraded))completion {
     if ([asset isKindOfClass:[PHAsset class]]) {
-        PHImageRequestOptions *option = [[PHImageRequestOptions alloc]init];
+        PHImageRequestOptions *option = [[PHImageRequestOptions alloc] init];
         option.networkAccessAllowed = YES;
+        option.resizeMode = PHImageRequestOptionsResizeModeFast;
         [[PHImageManager defaultManager] requestImageDataForAsset:asset options:option resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
             BOOL downloadFinined = (![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey]);
             if (downloadFinined && imageData) {