在iOS8-9系统下，使用PHAssetChangeRequest保存图片

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -627,16 +627,24 @@ 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:^{
-            PHAssetResourceCreationOptions *options = [[PHAssetResourceCreationOptions alloc] init];
-            options.shouldMoveFile = YES;
-            PHAssetCreationRequest *request = [PHAssetCreationRequest creationRequestForAsset];
-            [request addResourceWithType:PHAssetResourceTypePhoto data:data options:options];
-            if (location) {
-                request.location = location;
+            if (iOS9Later) {
+                PHAssetResourceCreationOptions *options = [[PHAssetResourceCreationOptions alloc] init];
+                options.shouldMoveFile = YES;
+                PHAssetCreationRequest *request = [PHAssetCreationRequest creationRequestForAsset];
+                [request addResourceWithType:PHAssetResourceTypePhoto data:data options:options];
+                if (location) {
+                    request.location = location;
+                }
+                request.creationDate = [NSDate date];
+            } else {
+                PHAssetChangeRequest *request = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
+                if (location) {
+                    request.location = location;
+                }
+                request.creationDate = [NSDate date];
             }
-            request.creationDate = [NSDate date];
         } completionHandler:^(BOOL success, NSError *error) {
             dispatch_sync(dispatch_get_main_queue(), ^{
                 if (success && completion) {