[iOS] Fix crashes.

ios/sdk/WeexSDK/Sources/Engine/WXSDKEngine.m

@@ -311,7 +311,7 @@ + (NSDictionary *)customEnvironment
 {
     NSDictionary* result = nil;
     @synchronized (self) {
-        result = _customEnvironment;
+        result = [_customEnvironment copy];
     }
     return result;
 }

ios/sdk/WeexSDK/Sources/Events/WXComponent+Events.m

@@ -965,19 +965,23 @@ - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 
 - (void)fireTouchEvent:(NSString *)eventName withTouches:(NSSet<UITouch *> *)touches
 {
+    if (_component == nil) {
+        return;
+    }
+
     NSMutableArray *resultTouches = [NSMutableArray new];
 
     CGPoint accmOffset = CGPointZero;
     UIView* rootView = _component.weexInstance.rootView;
-    UIView* view = self.view;
-    while (view && view != rootView) {
-        if ([view isKindOfClass:[UIScrollView class]]) {
-            CGPoint offset = ((UIScrollView*)view).contentOffset;
-            accmOffset.x += offset.x;
-            accmOffset.y += offset.y;
-        }
-        view = view.superview;
-    }
+//    UIView* view = self.view;
+//    while (view && view != rootView) {
+//        if ([view isKindOfClass:[UIScrollView class]]) {
+//            CGPoint offset = ((UIScrollView*)view).contentOffset;
+//            accmOffset.x += offset.x;
+//            accmOffset.y += offset.y;
+//        }
+//        view = view.superview;
+//    }
 
     for (UITouch *touch in touches) {
         CGPoint screenLocation = [touch locationInView:touch.window];
@@ -1002,7 +1006,9 @@ - (void)fireTouchEvent:(NSString *)eventName withTouches:(NSSet<UITouch *> *)tou
             }
         }
 
-        [resultTouches addObject:mutableResultTouch];
+        if (mutableResultTouch) { // component is nil, mutableResultTouch will be nil
+            [resultTouches addObject:mutableResultTouch];
+        }
     }
 
     [_component fireEvent:eventName params:@{@"changedTouches":resultTouches ?: @[]}];

ios/sdk/WeexSDK/Sources/Model/WXSDKInstance.m

@@ -244,7 +244,7 @@ - (void)renderWithURL:(NSURL *)url options:(NSDictionary *)options data:(id)data
 
 - (void)renderView:(id)source options:(NSDictionary *)options data:(id)data
 {
-    _options = options;
+    _options = [options isKindOfClass:[NSDictionary class]] ? options : nil;
     _jsData = data;
 
     self.needValidate = [[WXHandlerFactory handlerForProtocol:@protocol(WXValidateProtocol)] needValidate:self.scriptURL];
@@ -450,6 +450,9 @@ - (void)_renderWithRequest:(WXResourceRequest *)request options:(NSDictionary *)
     NSURL *url = request.URL;
     _scriptURL = url;
     _jsData = data;
+    if (![options isKindOfClass:[NSDictionary class]]) {
+        options = @{};
+    }
     NSMutableDictionary *newOptions = [options mutableCopy] ?: [NSMutableDictionary new];
 
     if (!newOptions[bundleUrlOptionKey]) {