no message

ZhiJi/AppDelegate.m

@@ -47,16 +47,20 @@
 
     [self logCollection];
     
-    self.window = [[UIWindow alloc] init];
-    self.window.frame = [UIScreen mainScreen].bounds;
-    self.window.backgroundColor = [UIColor whiteColor];
-    self.window.rootViewController = [UIViewController new];
-//    self.window.rootViewController = [[GuideViewController alloc] init];
-    //guide setting
-    [ZJGuideConfig configWithWindow:self.window finishMainVC:[BaseTabBarViewController new]];
-
-    [self.window makeKeyAndVisible];
+    // @available(iOS 13.0,*)表示iOS 13.0及以上的系统，后面的*表示所有平台
+    if (@available(iOS 13.0,*)) {
 
+    }else{
+        self.window = [[UIWindow alloc] init];
+        self.window.frame = [UIScreen mainScreen].bounds;
+        self.window.backgroundColor = [UIColor whiteColor];
+        [self.window makeKeyAndVisible];
+        
+        self.window.rootViewController = [[BaseViewController alloc] init];
+        //      guide setting
+        [ZJGuideConfig configWithWindow:self.window finishMainVC:[BaseTabBarViewController new]];
+    }
+    
     return YES;
 }