优化状态栏样式的配置

TZImagePickerController/TZImagePickerController/TZImagePickerController.m

@@ -23,6 +23,8 @@
     UIView *_HUDContainer;
     UIActivityIndicatorView *_HUDIndicatorView;
     UILabel *_HUDLable;
+    
+    UIStatusBarStyle _originStatusBarStyle;
 }
 @end
 
@@ -33,8 +35,6 @@
     self.view.backgroundColor = [UIColor whiteColor];
     self.navigationBar.barStyle = UIBarStyleBlack;
     self.navigationBar.translucent = YES;
-    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
-    [UIApplication sharedApplication].statusBarHidden = NO;
     [TZImageManager manager].shouldFixOrientation = NO;
 
     // Default appearance, you can reset these after this method
@@ -60,6 +60,17 @@
     [barItem setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
 }
 
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+    _originStatusBarStyle = [UIApplication sharedApplication].statusBarStyle;
+    [UIApplication sharedApplication].statusBarStyle = iOS7Later ? UIStatusBarStyleLightContent : UIStatusBarStyleBlackOpaque;
+}
+
+- (void)viewWillDisappear:(BOOL)animated {
+    [super viewWillDisappear:animated];
+    [UIApplication sharedApplication].statusBarStyle = _originStatusBarStyle;
+}
+
 - (instancetype)initWithMaxImagesCount:(NSInteger)maxImagesCount delegate:(id<TZImagePickerControllerDelegate>)delegate {
     TZAlbumPickerController *albumPickerVc = [[TZAlbumPickerController alloc] init];
     self = [super initWithRootViewController:albumPickerVc];