在iOS8-9系统下，使用PHAssetChangeRequest保存图片

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -627,8 +627,9 @@ static dispatch_once_t onceToken;
 
 - (void)savePhotoWithImage:(UIImage *)image location:(CLLocation *)location completion:(void (^)(NSError *error))completion {
     NSData *data = UIImageJPEGRepresentation(image, 0.9);
-    if (iOS9Later) { // 这里有坑... iOS8系统下这个方法保存图片会失败 原来是因为PHAssetResourceType是iOS9之后的...
+    if (iOS8Later) {
         [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
+            if (iOS9Later) {
                 PHAssetResourceCreationOptions *options = [[PHAssetResourceCreationOptions alloc] init];
                 options.shouldMoveFile = YES;
                 PHAssetCreationRequest *request = [PHAssetCreationRequest creationRequestForAsset];
@@ -637,6 +638,13 @@ static dispatch_once_t onceToken;
                     request.location = location;
                 }
                 request.creationDate = [NSDate date];
+            } else {
+                PHAssetChangeRequest *request = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
+                if (location) {
+                    request.location = location;
+                }
+                request.creationDate = [NSDate date];
+            }
         } completionHandler:^(BOOL success, NSError *error) {
             dispatch_sync(dispatch_get_main_queue(), ^{
                 if (success && completion) {