新增onlyReturnAsset属性，为YES时选择器不获取大图，只返回asset出去

TZImagePickerController/TZImagePickerController/TZImagePickerController.h

@@ -102,6 +102,10 @@
 /// 默认为YES，如果设置为NO, 选择器将不会自己dismiss
 @property(nonatomic, assign) BOOL autoDismiss;
 
+/// Default is YES, if set NO, in the delegate method the photos and infos will be nil, only assets hava value.
+/// 默认为NO，如果设置为YES，代理方法里photos和infos会是nil，只返回assets
+@property (assign, nonatomic) BOOL onlyReturnAsset;
+
 /// The photos user have selected
 /// 用户选中过的图片数组
 @property (nonatomic, strong) NSMutableArray *selectedAssets;

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -352,43 +352,52 @@ static CGFloat itemMargin = 5;
     }
     
     [tzImagePickerVc showProgressHUD];
-    NSMutableArray *photos = [NSMutableArray array];
     NSMutableArray *assets = [NSMutableArray array];
-    NSMutableArray *infoArr = [NSMutableArray array];
-    for (NSInteger i = 0; i < tzImagePickerVc.selectedModels.count; i++) { [photos addObject:@1];[assets addObject:@1];[infoArr addObject:@1]; }
-    
-    __block BOOL havenotShowAlert = YES;
-    [TZImageManager manager].shouldFixOrientation = YES;
-    __block id alertView;
-    for (NSInteger i = 0; i < tzImagePickerVc.selectedModels.count; i++) {
-        TZAssetModel *model = tzImagePickerVc.selectedModels[i];
-        [[TZImageManager manager] getPhotoWithAsset:model.asset completion:^(UIImage *photo, NSDictionary *info, BOOL isDegraded) {
-            if (isDegraded) return;
-            if (photo) {
-                photo = [self scaleImage:photo toSize:CGSizeMake(tzImagePickerVc.photoWidth, (int)(tzImagePickerVc.photoWidth * photo.size.height / photo.size.width))];
-                [photos replaceObjectAtIndex:i withObject:photo];
-            }
-            if (info)  [infoArr replaceObjectAtIndex:i withObject:info];
-            [assets replaceObjectAtIndex:i withObject:model.asset];
-            
-            for (id item in photos) { if ([item isKindOfClass:[NSNumber class]]) return; }
-            
-            if (havenotShowAlert) {
-                [tzImagePickerVc hideAlertView:alertView];
-                [self didGetAllPhotos:photos assets:assets infoArr:infoArr];
-            }
-        } progressHandler:^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
-            // 如果图片正在从iCloud同步中,提醒用户
-            if (progress < 1 && havenotShowAlert && !alertView) {
-                [tzImagePickerVc hideProgressHUD];
-                alertView = [tzImagePickerVc showAlertWithTitle:[NSBundle tz_localizedStringForKey:@"Synchronizing photos from iCloud"]];
-                havenotShowAlert = NO;
-                return;
-            }
-            if (progress >= 1) {
-                havenotShowAlert = YES;
-            }
-        } networkAccessAllowed:YES];
+    NSMutableArray *photos;
+    NSMutableArray *infoArr;
+    if (tzImagePickerVc.onlyReturnAsset) { // not fetch image
+        for (NSInteger i = 0; i < tzImagePickerVc.selectedModels.count; i++) {
+            TZAssetModel *model = tzImagePickerVc.selectedModels[i];
+            [assets addObject:model.asset];
+        }
+    } else { // fetch image
+        photos = [NSMutableArray array];
+        infoArr = [NSMutableArray array];
+        for (NSInteger i = 0; i < tzImagePickerVc.selectedModels.count; i++) { [photos addObject:@1];[assets addObject:@1];[infoArr addObject:@1]; }
+        
+        __block BOOL havenotShowAlert = YES;
+        [TZImageManager manager].shouldFixOrientation = YES;
+        __block id alertView;
+        for (NSInteger i = 0; i < tzImagePickerVc.selectedModels.count; i++) {
+            TZAssetModel *model = tzImagePickerVc.selectedModels[i];
+            [[TZImageManager manager] getPhotoWithAsset:model.asset completion:^(UIImage *photo, NSDictionary *info, BOOL isDegraded) {
+                if (isDegraded) return;
+                if (photo) {
+                    photo = [self scaleImage:photo toSize:CGSizeMake(tzImagePickerVc.photoWidth, (int)(tzImagePickerVc.photoWidth * photo.size.height / photo.size.width))];
+                    [photos replaceObjectAtIndex:i withObject:photo];
+                }
+                if (info)  [infoArr replaceObjectAtIndex:i withObject:info];
+                [assets replaceObjectAtIndex:i withObject:model.asset];
+                
+                for (id item in photos) { if ([item isKindOfClass:[NSNumber class]]) return; }
+                
+                if (havenotShowAlert) {
+                    [tzImagePickerVc hideAlertView:alertView];
+                    [self didGetAllPhotos:photos assets:assets infoArr:infoArr];
+                }
+            } progressHandler:^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
+                // 如果图片正在从iCloud同步中,提醒用户
+                if (progress < 1 && havenotShowAlert && !alertView) {
+                    [tzImagePickerVc hideProgressHUD];
+                    alertView = [tzImagePickerVc showAlertWithTitle:[NSBundle tz_localizedStringForKey:@"Synchronizing photos from iCloud"]];
+                    havenotShowAlert = NO;
+                    return;
+                }
+                if (progress >= 1) {
+                    havenotShowAlert = YES;
+                }
+            } networkAccessAllowed:YES];
+        }
     }
     if (tzImagePickerVc.selectedModels.count <= 0) {
         [self didGetAllPhotos:photos assets:assets infoArr:infoArr];