diff --git a/CHANGELOG.md b/CHANGELOG.md
index c1806f9..f134252 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,9 +3,9 @@
 
 ---
 
-## [V1.3.0](https://github.com/youngsoft/TangramKit/releases/tag/1.3.0)(2018/09/29)
+## [V1.3.1](https://github.com/youngsoft/TangramKit/releases/tag/1.3.1)(2018/09/21)
 #### Fixed
-1. 为实现对Swift4.0的支持而修复了所有编译告警的问题。
+1. 为实现对Swift4.0/4.2的支持而修复了所有编译告警的问题。
 2. 修复了浮动布局TGFloatLayout中的子视图在设置尺寸为TGWeight类型时的一个比例计算的错误问题。
 3. 实现对iPhoneXR、iPhoneXS、iPhoneXSMAX的tg_padding的安全区缩进的改进支持。
 4. 实现了在Application Extension中使用布局库时报UIApplication对象不支持或者不存在的问题。
diff --git a/TangramKit.podspec b/TangramKit.podspec
index ff422b7..7ae14d5 100644
--- a/TangramKit.podspec
+++ b/TangramKit.podspec
@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "TangramKit"
-  s.version      = "1.3.0"
+  s.version      = "1.3.1"
   s.summary      = "TangramKit is A powerful iOS UI framework. It integrated the Android layout,AutoLayout,SizeClass, HTML/CSS float and flexbox functions."
 
   s.description  = <<-DESC
diff --git a/TangramKit.xcodeproj/project.pbxproj b/TangramKit.xcodeproj/project.pbxproj
index f60bf95..a6a1f6a 100644
--- a/TangramKit.xcodeproj/project.pbxproj
+++ b/TangramKit.xcodeproj/project.pbxproj
@@ -832,7 +832,7 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 4.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -862,7 +862,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 4.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
diff --git a/TangramKit/TGBaseLayout.swift b/TangramKit/TGBaseLayout.swift
index 14fb041..4a412f2 100644
--- a/TangramKit/TGBaseLayout.swift
+++ b/TangramKit/TGBaseLayout.swift
@@ -1384,6 +1384,7 @@ open class TGBaseLayout: UIView,TGLayoutViewSizeClass {
     ///   - target: 事件的处理对象，如果设置为nil则表示取消事件。
     ///   - action: 事件的处理动作，格式为：func handleAction(sender:TGBaseLayout)
     ///   - controlEvents: 支持的事件类型，目前只支持：touchDown、touchUpInside、touchCancel这三个事件。
+    #if swift(>=4.2)
     public func tg_setTarget(_ target: NSObjectProtocol?, action: Selector?, for controlEvents: UIControl.Event)
     {
         if _tgTouchEventDelegate == nil
@@ -1393,6 +1394,19 @@ open class TGBaseLayout: UIView,TGLayoutViewSizeClass {
         
         _tgTouchEventDelegate?.setTarget(target, action: action, for: controlEvents)
     }
+    #else
+    public func tg_setTarget(_ target: NSObjectProtocol?, action: Selector?, for controlEvents: UIControlEvents)
+    {
+    
+    
+        if _tgTouchEventDelegate == nil
+        {
+            _tgTouchEventDelegate = TGTouchEventDelegate(self)
+        }
+        
+        _tgTouchEventDelegate?.setTarget(target, action: action, for: controlEvents)
+    }
+    #endif
     
     /**
      设置布局按下时背景的高亮的颜色。只有设置了tg_setTarget方法后此属性才生效。
@@ -2018,13 +2032,13 @@ open class TGBaseLayout: UIView,TGLayoutViewSizeClass {
                 if let t = lsc.width.sizeVal
                 {
                     //约束冲突：宽度依赖的视图不是父视图
-                    assert(t.view == newSuperview, "Constraint exception!! \(self)width dependent on:\(t.view) is not superview")
+                    assert(t.view == newSuperview, "Constraint exception!! \(self)width dependent on:\(t.view!) is not superview")
                 }
                 
                 if let t = lsc.height.sizeVal
                 {
                     //约束冲突：高度依赖的视图不是父视图
-                    assert(t.view == newSuperview, "Constraint exception!! \(self)height dependent on:\(t.view) is not superview")
+                    assert(t.view == newSuperview, "Constraint exception!! \(self)height dependent on:\(t.view!) is not superview")
                 }
                 
             #endif
@@ -3574,6 +3588,8 @@ private class TGTouchEventDelegate
         TGTouchEventDelegate._CurrentLayout = nil
     }
     
+    #if swift(>=4.2)
+    
     func setTarget(_ target: NSObjectProtocol?, action: Selector?, for controlEvents: UIControl.Event)
     {
         //just only support these events
@@ -3595,6 +3611,30 @@ private class TGTouchEventDelegate
         }
 
     }
+    #else
+    
+    func setTarget(_ target: NSObjectProtocol?, action: Selector?, for controlEvents: UIControlEvents)
+    {
+        //just only support these events
+        switch controlEvents {
+        case UIControlEvents.touchDown:
+            _touchDownTarget = target
+            _touchDownAction = action
+            break
+        case UIControlEvents.touchUpInside:
+            _touchUpTarget = target
+            _touchUpAction = action
+            break
+        case UIControlEvents.touchCancel:
+            _touchCancelTarget = target
+            _touchCancelAction = action
+            break
+        default:
+        return
+        }
+    }
+    
+    #endif
     
     func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?)
     {
diff --git a/TangramKit/TGPathLayout.swift b/TangramKit/TGPathLayout.swift
index 4bea0fe..9972cc3 100644
--- a/TangramKit/TGPathLayout.swift
+++ b/TangramKit/TGPathLayout.swift
@@ -385,12 +385,24 @@ open class TGPathLayout : TGBaseLayout,TGPathLayoutViewSizeClass {
         }
     }
     
+    #if swift(>=4.2)
+    
+    open override func sendSubviewToBack(_ view: UIView) {
+        if tg_originView == view {
+            return
+        }
+        super.sendSubviewToBack(view)
+    }
+    
+    #else
+    
     open override func sendSubview(toBack view: UIView) {
         if tg_originView == view {
             return
         }
         super.sendSubview(toBack: view)
     }
+    #endif
     
     open override func willRemoveSubview(_ subview: UIView) {
         super.willRemoveSubview(subview)
diff --git a/TangramKit/TangramKit.swift b/TangramKit/TangramKit.swift
index c2d675a..b790830 100644
--- a/TangramKit/TangramKit.swift
+++ b/TangramKit/TangramKit.swift
@@ -53,7 +53,7 @@
  
  */
 
-//Current version is 1.3.0, please open: https://github.com/youngsoft/TangramKit/blob/master/CHANGELOG.md to show the changes.
+//Current version is 1.3.1, please open: https://github.com/youngsoft/TangramKit/blob/master/CHANGELOG.md to show the changes.