修复横屏下预览图片位置偏移的问题

TZImagePickerController/TZImagePickerController/TZPhotoPreviewCell.m

@@ -288,7 +288,7 @@
         
         _imageContainerView.tz_width = width;
         _imageContainerView.tz_height = self.tz_height;
-        _imageContainerView.tz_centerX = self.tz_width  / 2;
+        _imageContainerView.tz_centerX = self.scrollView.tz_width  / 2;
     } else {
         CGFloat height = image.size.height / image.size.width * self.scrollView.tz_width;
         if (height < 1 || isnan(height)) height = self.tz_height;

TZImagePickerController/TZImagePickerController/TZPhotoPreviewController.m

@@ -207,6 +207,9 @@
     _collectionView.showsHorizontalScrollIndicator = NO;
     _collectionView.contentOffset = CGPointMake(0, 0);
     _collectionView.contentSize = CGSizeMake(self.models.count * (self.view.tz_width + 20), 0);
+    if (@available(iOS 11, *)) {
+        _collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
+    }
     [self.view addSubview:_collectionView];
     [_collectionView registerClass:[TZPhotoPreviewCell class] forCellWithReuseIdentifier:@"TZPhotoPreviewCell"];
     [_collectionView registerClass:[TZVideoPreviewCell class] forCellWithReuseIdentifier:@"TZVideoPreviewCell"];

TZImagePickerController/ViewController.m

@@ -116,6 +116,9 @@
     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
         self.scrollView.contentSize = CGSizeMake(0, contentSizeH + 5);
     });
+    if (self.scrollView.tz_height + 80 > self.view.tz_height) {
+        self.scrollView.tz_height = self.view.tz_height - 80;
+    }
     
     _margin = 4;
     _itemWH = (self.view.tz_width - 2 * _margin - 4) / 3 - _margin;