新增isFetchingMedia标志位，在获取大图时相册的变化忽略掉

TZImagePickerController/TZImagePickerController/TZImagePickerController.h

@@ -67,8 +67,8 @@
 /// Default is 600px / 默认600像素宽
 @property (nonatomic, assign) CGFloat photoPreviewMaxWidth;
 
-/// Default is 15, While fetching photo, HUD will dismiss automatic if timeout;
-/// 超时时间，默认为15秒，当取图片时间超过15秒还没有取成功时，会自动dismiss HUD；
+/// Default is 30, While fetching photo, HUD will dismiss automatic if timeout;
+/// 超时时间，默认为30秒，当取图片时间超过30秒还没有取成功时，会自动dismiss HUD；
 @property (nonatomic, assign) NSInteger timeout;
 
 /// Default is YES, if set NO, the original photo button will hide. user can't picking original photo.

TZImagePickerController/TZImagePickerController/TZImagePickerController.m

@@ -268,7 +268,7 @@
 
 - (void)configDefaultSetting {
     self.autoSelectCurrentWhenDone = YES;
-    self.timeout = 15;
+    self.timeout = 30;
     self.photoWidth = 828.0;
     self.photoPreviewMaxWidth = 600;
     self.naviTitleColor = [UIColor whiteColor];

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -45,6 +45,7 @@
 @property (strong, nonatomic) CLLocation *location;
 @property (nonatomic, strong) NSOperationQueue *operationQueue;
 @property (nonatomic, assign) BOOL isSavingMedia;
+@property (nonatomic, assign) BOOL isFetchingMedia;
 @end
 
 static CGSize AssetGridThumbnailSize;
@@ -440,6 +441,7 @@ static CGFloat itemMargin = 5;
     
     [tzImagePickerVc showProgressHUD];
     _doneButton.enabled = NO;
+    self.isFetchingMedia = YES;
     NSMutableArray *assets = [NSMutableArray array];
     NSMutableArray *photos;
     NSMutableArray *infoArr;
@@ -502,6 +504,7 @@ static CGFloat itemMargin = 5;
     TZImagePickerController *tzImagePickerVc = (TZImagePickerController *)self.navigationController;
     [tzImagePickerVc hideProgressHUD];
     _doneButton.enabled = YES;
+    self.isFetchingMedia = NO;
 
     if (tzImagePickerVc.autoDismiss) {
         [self.navigationController dismissViewControllerAnimated:YES completion:^{
@@ -963,7 +966,7 @@ static CGFloat itemMargin = 5;
 #pragma mark - PHPhotoLibraryChangeObserver
 
 - (void)photoLibraryDidChange:(PHChange *)changeInstance {
-    if (self.isSavingMedia) {
+    if (self.isSavingMedia || self.isFetchingMedia) {
         return;
     }
     dispatch_async(dispatch_get_main_queue(), ^{