From 90f535d86e1a234383fac202a4cd92d5aba2e9f7 Mon Sep 17 00:00:00 2001
From: acton393 <zhangxing610321@gmail.com>
Date: Wed, 15 Nov 2017 17:08:20 +0800
Subject: [PATCH] [WEEX-120][iOS]try to optimize unload weex component

 try to reduce context switch when unload component.

Bug:120
---
 .../Sources/Manager/WXComponentManager.m      | 24 +++++++------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/ios/sdk/WeexSDK/Sources/Manager/WXComponentManager.m b/ios/sdk/WeexSDK/Sources/Manager/WXComponentManager.m
index 691f713870..4f6c06c256 100644
--- a/ios/sdk/WeexSDK/Sources/Manager/WXComponentManager.m
+++ b/ios/sdk/WeexSDK/Sources/Manager/WXComponentManager.m
@@ -711,25 +711,19 @@ - (void)refreshFinish
 - (void)unload
 {
     WXAssertComponentThread();
-    
-    NSEnumerator *enumerator = [_indexDict objectEnumerator];
-    WXComponent *component;
-    while ((component = [enumerator nextObject])) {
-        dispatch_async(dispatch_get_main_queue(), ^{
+    [self invalidate];
+    [self _stopDisplayLink];
+    NSEnumerator *enumerator = [[_indexDict copy] objectEnumerator];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        WXComponent *component;
+        while ((component = [enumerator nextObject])) {
             [component _unloadViewWithReusing:NO];
-        });
-    }
+        }
+        _rootComponent = nil;
+    });
     
     [_indexDict removeAllObjects];
     [_uiTaskQueue removeAllObjects];
-
-    dispatch_async(dispatch_get_main_queue(), ^{
-         _rootComponent = nil;
-    });
-    
-    [self _stopDisplayLink];
-    
-    _isValid = NO;
 }
 
 - (void)invalidate